BC127 (-HD,-EXT) Tech Specification Datasheet by Sierra Wireless

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33.32?! SIERRA WIRELESS’
Product Technical Specification
BC127, BC127-HD, BC127-EXT
41110693
Rev 1
Product Technical Specification
Rev 1 Apr.17 2 41110693
Important
Notice
Due to the nature of wireless communications, transmission and reception of data
can never be guaranteed. Data may be delayed, corrupted (i.e., have errors) or be
totally lost. Although significant delays or losses of data are rare when wireless
devices such as the Sierra Wireless modem are used in a normal manner with a
well-constructed network, the Sierra Wireless modem should not be used in
situations where failure to transmit or receive data could result in damage of any
kind to the user or any other party, including but not limited to personal injury,
death, or loss of property. Sierra Wireless accepts no responsibility for damages
of any kind resulting from delays or errors in data transmitted or received using
the Sierra Wireless modem, or for failure of the Sierra Wireless modem to
transmit or receive such data.
Safety and
Hazards
Do not operate the Sierra Wireless modem in areas where blasting is in progress,
where explosive atmospheres may be present, near medical equipment, near life
support equipment, or any equipment which may be susceptible to any form of
radio interference. In such areas, the Sierra Wireless modem MUST BE
POWERED OFF. The Sierra Wireless modem can transmit signals that could
interfere with this equipment.
Do not operate the Sierra Wireless modem in any aircraft, whether the aircraft is
on the ground or in flight. In aircraft, the Sierra Wireless modem MUST BE
POWERED OFF. When operating, the Sierra Wireless modem can transmit
signals that could interfere with various onboard systems.
Note: Some airlines may permit the use of cellular phones while the aircraft is on the
ground and the door is open. Sierra Wireless modems may be used at this time.
The driver or operator of any vehicle should not operate the Sierra Wireless
modem while in control of a vehicle. Doing so will detract from the driver or
operator's control and operation of that vehicle. In some states and provinces,
operating such communications devices while in control of a vehicle is an offence.
Limitation of
Liability
The information in this manual is subject to change without notice and does not
represent a commitment on the part of Sierra Wireless. SIERRA WIRELESS AND
ITS AFFILIATES SPECIFICALLY DISCLAIM LIABILITY FOR ANY AND ALL
DIRECT, INDIRECT, SPECIAL, GENERAL, INCIDENTAL, CONSEQUENTIAL,
PUNITIVE OR EXEMPLARY DAMAGES INCLUDING, BUT NOT LIMITED TO,
LOSS OF PROFITS OR REVENUE OR ANTICIPATED PROFITS OR REVENUE
ARISING OUT OF THE USE OR INABILITY TO USE ANY SIERRA WIRELESS
PRODUCT, EVEN IF SIERRA WIRELESS AND/OR ITS AFFILIATES HAS BEEN
ADVISED OF THE POSSIBILITY OF SUCH DAMAGES OR THEY ARE
FORESEEABLE OR FOR CLAIMS BY ANY THIRD PARTY.
Notwithstanding the foregoing, in no event shall Sierra Wireless and/or its
affiliates aggregate liability arising under or in connection with the Sierra Wireless
product, regardless of the number of events, occurrences, or claims giving rise to
liability, be in excess of the price paid by the purchaser for the Sierra Wireless
product.
Preface
Rev 1 Apr.17 3 41110693
Patents This product may contain technology developed by or for Sierra Wireless Inc. This
product includes technology licensed from QUALCOMM®. This product is
manufactured or sold by Sierra Wireless Inc. or its affiliates under one or more
patents licensed from InterDigital Group and MMP Portfolio Licensing.
Copyright © 2017 Sierra Wireless. All rights reserved.
Trademarks Sierra Wireless®, AirPrime®, AirLink®, AirVantage® and the Sierra Wireless logo
are registered trademarks of Sierra Wireless.
Windows® and Windows Vista® are registered trademarks of Microsoft
Corporation.
Macintosh® and Mac OS X® are registered trademarks of Apple Inc., registered in
the U.S. and other countries.
QUALCOMM® is a registered trademark of QUALCOMM Incorporated. Used
under license.
Other trademarks are the property of their respective owners.
Contact
Information
Revision
History
Sales information and technical
support, including warranty and returns
Web: sierrawireless.com/company/contact-us/
Global toll-free number: 1-877-687-7795
6:00 am to 6:00 pm PST
Corporate and product information Web: sierrawireless.com
Revision
number
Release date Changes
1March 2, 2017 Initial conversion to SWI template.
—>>I
Rev 1 Apr.17 4 41110693
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Key Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
General Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
RF Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Audio Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Electric Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Product Models. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Physical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Module Footprint. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Placement Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Audio Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Hardware Design Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
BC127/BC127-HD with a Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Boot Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Charging and Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
BC127-EXT for Extended Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Role of VREG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
ESD protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Role of VREG. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Connection Microphones . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Mono Microphone Example Schematic . . . . . . . . . . . . . . . . . . . . . . . . . .20
Connecting Speakers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
External Amplifier Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
External Speaker Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
GPIO and UART. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Digital Pin States on Reset or After Power Up . . . . . . . . . . . . . . . . . . . . .25
Contents
Rev 1 Apr.17 5 41110693
BC127 and BC127-HD With External Supply . . . . . . . . . . . . . . . . . . . . . . . 26
Boot Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
BC127/BC127-HD/BC127-EXT to Wake-Up an External Processor on Connection
27
Power Supply Sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
GPIO Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Solder Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Regulatory Certifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
United States - FCC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Canada IC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Bluetooth Qualification Program (BQP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Packaging Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Main Box Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Inside Tape and Reel Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
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1
1: Introduction
The BC127/BC127-HD/BC-127EXT is a highly flexible, low power, small form factor
Bluetooth Audio module. The BC127, BC127HD, and BC127-EXT are Bluetooth
Version 4.2 Certified.
The model comes preloaded with Sierra Wireless Melody software, and is ideal for
developers who want to quickly and cost effectively integrate Bluetooth functionality
into their products.
Figure 1-1: BC127
Note: this is an example image and does not represent the label used on commercial
shipments.
Figure 1-2: BC127 Flow Diagram
BC127-EXT ........ £$§£
Introduction
Rev 1 Apr.17 7 41110693
Figure 1-3: BC127-EXT Flow Diagram
Applications
Wireless Speakers, Docks and Headsets
SmartPhone Controlled Audio Systems
Automotive Infotainment Systems
Medical Devices
High Quality Audio Streaming
Gaming Accessories and MP3 Players
Key Specifications
Bluetooth Certified 4.2 Audio module
Dual Mode: Bluetooth and Bluetooth Low Energy (BLE)
Backwards compatible with 1.1, 2.0, 2.1 + EDR and 3.0
Embedded Bluetooth Protocol Stack
Supports HFP, A2DP, AVRCP, PBAP and SPP
Supports IAP1/IAP2 profiles for connection to iOS devices
Simple UART and GPIO interface for command and control
Can connect to external codecs with I2S, PCM, SPDIF interface
Includes aptX-HD™ license and algorithm1
Small form factor (11.8mm x 18mm x 3.2mm)
1. Only on BC127-HD
Product Technical Specification
Rev 1 Apr.17 8 41110693
General Specifications
RF Specifications
Audio Specifications
Table 1-1: General Specifications
Specification Description
Bluetooth Standard Bluetooth 4.2 Class 2
Interfaces UART, AIO, GPIO, USB, SPI, Audio In, Mic In, PCM, I2S,
SPDIF, I2C
Size 11.8mm x 18mm x 3.2mm
Weight 1.1g
Table 1-2: RF Specifications
Specification Description
Frequency Band 2,402 MHz to 2,480 MHz
Modulation 8 DPSK, PI/4 DQPSK, GFSK
Maximum Data Rate 3Mbps (typical 1.6Mbps)
Operating Range 20m to 30m
RF Sensitivity 0.1% BER at -88dBm
Transmit Power BER/EDR Class2 < 4dBm, BLE < 10dBm
Table 1-3: Audio Specifications
Specification Description
DAC resolution 16 bits
DAC Output Sample
Rate
8 KHz to 90 KHz
DAC SNR 96dB
Stereo Separation -87.7dB
Introduction
Rev 1 Apr.17 9 41110693
Electric Specifications
Product Models
BC127/BC127-HD/BC127-EXT modules are shipped flashed with the latest
Melody firmware production build. Customers need to confirm at order with
distributors that they will receive the firmware build they require. For volume
orders (1k quantities), the BC127/BC127-HD/BC127-EXT can be shipped flashed
with custom firmware.
Table 1-4: Electrical Specifications
Specification Description
Supply Voltage 3.3V to 4.7 V DC (supports Li-ion battery voltage range)
Typical Current 15mA (music streaming)
Typical Current Idle <1mA (connectable)
Operating
Temperature
-40°C to 85°C
Storage
Temperature
-40°C to 105°C
Table 1-5: Model Names
Models Description
BC127 Class2 Bluetooth 4.2 Module with integrated chip antenna
BC127-EXT Class2 Bluetooth 4.2 Module with external antenna
connection
BC127-HD Class2 Bluetooth 4.2 Module with integrated chip antenna &
support for aptX HD® audio
BC127-HD-EXT Class2 Bluetooth 4.2 Module with external antenna
connection & support for aptX HD® audio
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Rev 1 Apr.17 10
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2
2: Physical Characteristics
Module Footprint
Figure 2-1: Module Footprint
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Physical Characteristics
Rev 1 Apr.17 11 41110693
Placement Considerations
Figure 2-2: Placement Layout
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Rev 1 Apr.17 12
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3
3: Audio Circuit
The Audio circuit consists of:
two independent 16-bit high-quality ADC channels:
·Programmable as either microphone or line input
·Programmable as either stereo or dual-mono input
·Multiplexed with two of the digital microphone inputs
·Each channel is independently configurable to be either single-ended or fully
differential
·Each channel has an analog and digital programmable gain stage
A dual differential class A-B output stage. If a single ended audio output is
required, use an external differential to single-ended converter.
The main features of the interface are:
Stereo and mono analog input for voice band and audio band
Stereo and mono analog output for voice band and audio band
Support for stereo digital audio bus standards such as I2S
Support for IEC-60958 standard stereo digital audio bus standards (e.g. SPDIF
and AES3)
Support for PCM including PCM master codecs that require an external system
clock
The analog audio diagram is shown in Figure 3-1:
Figure 3-1: Audio Diagram
Audio Circuit
Rev 1 Apr.17 13 41110693
Pin Descriptions
Table 3-1: Pin Descriptions for the BC127/BC127-HD/BC127EXT
No Pin Name Pin Type Pin Description
1GND GND Common Ground
2GND GND Common Ground
3GND GND Common Ground
4GND GND Common Ground
5PIO_6/
PCM2_SYNC
Bi-directional Programmable I/O (PCM2_SYNC or
I2S_S)
6PIO_7/
PCM2_CLK
Bi-directional Programmable I/O (PCM2_CLK or
I2S_CLK)
7CAP_SENSE_1 Analog Input Capacitive Touch Sense Input
8CAP_SENSE_4 Analog Input Capacitive Touch Sense Input
9CAP_SENSE_3 Analog Input Capacitive Touch Sense Input
10 CAP_SENSE_2 Analog Input Capacitive Touch Sense Input
11 GND GND Common Ground
12 AIO_1 Bi-directional Analog programmable input/output line
13 SPKR_LN Audio output Speaker output negative, left
14 SPKR_LP Audio output Speaker output positive, left
15 SPKR_RN Audio output Speaker output negative, right
16 SPKR_RP Audio output Speaker output positive, right
17 MIC_BIAS_A Analog Input Microphone bias
18 MIC_RN Analog Input Microphone input negative, right
19 MIC_RP Analog Input Microphone input positive, right
20 MIC_LN Analog Input Microphone input negative, left
21 MIC_LP Analog Input Microphone input positive, left
22 GND GND Common Ground
23 PIO_0 Bi-directional Programmable input/output line
24 PIO_1 Bi-directional Programmable input/output line
25 PIO_5/
PCM2_OUT
Bi-directional Programmable I/O (PCM2_OUT or
I2S_OUT)
26 PIO_4/
PCM2_IN
Bi-directional Programmable I/O (PCM2_IN or I2S_IN)
27 GND GND Common Ground
Product Technical Specification
Rev 1 Apr.17 14 41110693
28 VREGEN Analogue Take High to Enable Switch-Mode
Regulator
29 CHG_EXT Charger input External battery charger control
30 VCHG Charger input Battery Charger Input
31 VBAT_SENSE Battery Sense Battery Charger Sense
32 VBAT Battery terminal
+ve
Battery Positive
33 VDD_PADS Supply Positive Supply input
34 3V3_USB Supply Positive Supply output
35 USB_N Bi-directional USB data negative
36 USB_P Bi-directional USB data positive
37 LED_0 Open drain output LED Driver
38 LED_1 Open drain output LED Driver
39 LED_2 Open drain output LED Driver
40 UART_CTS Bi-directional UART Clear to Send
41 UART_TX Bi-directional UART TX Data
42 UART_RX Bi-directional UART RX Data
43 UART_RTS Bi-directional UART request to send, active low
44 RST# Reset Input with
Pull-Up
Reset if low for more than 5ms
45 SPI_PCM# Input Select PCM/SPI
46 PCM1_SYNC Bi-directional Synchronous data sync
47 PCM1_CLK Bi-directional Synchronous data clock
48 PCM1_OUT CMOS output Synchronous data output
49 PCM1_IN CMOS input Synchronous data input
50 PIO_2 Bi-directional Programmable input/output line
51 PIO_3 Bi-directional Programmable input/output line
Table 3-2: Additional Pins on the BC127-EXT
No Pin Name Pin Type Pin Description
52 GND GND Common Ground
Table 3-1: Pin Descriptions for the BC127/BC127-HD/BC127EXT
No Pin Name Pin Type Pin Description
Audio Circuit
Rev 1 Apr.17 15 41110693
Notes
PIO_X are bidirectional with weak pull down
Reset Input is with strong pull-up
USB data positive with selectable internal 1.5kΩ pull up resistor
UART are bidirectional with weak pull up
PCM_OUT, IN, SYNC, and CLK can be used as SPI_MISO, MOSI, CSB, and
CLK respectively. SPI-PCM# high switches SPI/PCM lines to SPI, low
switches to PCM/PIO use
53 BT RF BT RF BT RF
54 GND GND Common Ground
Table 3-2: Additional Pins on the BC127-EXT
No Pin Name Pin Type Pin Description
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4
4: Hardware Design Guidelines
BC127/BC127-HD with a Battery
Figure 4-1: Hardware Design
Note 1. VREGEN should be driven high 5ms after VBAT is applied to boot the
module.
Referring to the figure above, a Li-ion battery is connected to VBAT and VBUS from
an external USB source is connected to VCHG. It is assumed that the VBUS supply is
not connected permanently but periodically.
*This is the minimum voltage allowed to enable the module in the boot modes
described below.
Table 4-1: Pin Voltages
Net Min Typ Max
VCHG 3.1V*/4.75V 5V 5.75V
VBAT_SENSE 2.8V 3.7V 4.25V
VBAT 2.8V 3.7V 4.25V
VDD_PADS 1.7V 3.3V 3.6V
VREGEN 2.8V 3.7V 4.25V
Hardware Design Guidelines
Rev 1 Apr.17 17 41110693
VCHG is the input to the battery charger regulator.
VBAT_SENSE is the input to the Battery sensor circuitry.
VBAT is the main supply input to the internal switch mode and LDO regulators
and is the supply domain for VREGEN.
VDD_PADS is the supply to all the I/O domains for PIO, UART, PCM, LED and
RST#.
Boot Modes
The module will boot automatically whenever a voltage greater than 3.1V is
applied to VCHG (for example, when a USB source is plugged in).
The module does not support a soft start supply configuration, for fast transient
supply sources or supply sources with limited sourcing current use a filter (see
R3/C4 in the main schematic above) to slow the rising edge of the supply voltage
at turn on. A large inrush current at turn on can cause a dipping of the supply
voltage applied to the module, in turn causing the module to lock out, adding the
filter as shown keeps the input supply voltage rise monotonic and avoids lock out.
Charging and Battery
In this configuration an external pass transistor is connected between VCHG,
VBAT_SENSE, and CHG_EXT to support an external fast charge configuration.
VBAT_SENSE is connected to VBAT via a 400mR resistor.
The charging current is by default 150mAmp. It can be configured by UART
command to be between 0 and 200mAmp. Please refer to the Melody Manual for
configuration.
R1 and C1 in the main schematic diagram form a RC snubber circuit that is
designed to maintain stability over a wide range of Battery ESRs. The maximum
ESR of the battery should not exceed 1Ω.
The external VBUS voltage connected to VCHG is used to supply the current to
charge the battery. Typically this comes from an external USB source.
In the above circuit VDD_PADS is supplied by a regulated voltage from VBAT, in
the case of batteries that are flat or discharged, the absence of a voltage on
VDD_PADS will halt the booting of the module. Therefore to ensure that a voltage
is available on VDD_PADS to support discharged batteries, the following circuit is
required. This circuit combines the VBAT and VCHG inputs to generate the
supply for VDD_PADS.
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Product Technical Specification
Rev 1 Apr.17 18 41110693
Figure 4-2: Circuit to Support Discharged Battery Starting
If the voltage of the battery is below 2.9V, the charger will enter ‘trickle charge
mode’, when in this mode, the battery is charged at a current of a few milliamps in
order to safely charge deeply discharged batteries. Once the voltage of the
battery reaches anything above 2.9 V, fast charging mode will be used. In this
mode, the battery is charged at the current configured by the user in the battery
configuration settings, provided that there is enough headroom between the
charger’s input voltage and the voltage of the battery.
The BC127/BC127-HD will stop charging when the voltage at VBAT_SENSE
reaches 4.2V. The BC127/BC127-HD will shut down when the battery voltage
reaches 2.9V indicating that the battery is depleted.
BC127-EXT for Extended Range
The BC127-EXT (BC128 in the schematics in Figure 4-3 below) supports the
same supply and control configurations as the BC127. The BC127-EXT supports
an external 50 Ohm RF port for use in larger area applications to connect to an
external antenna with a greater gain than the internal module antenna for
extended range.
Hardware Design Guidelines
Rev 1 Apr.17 19 41110693
Figure 4-3: BC128 for Extended Range
Role of VREG
Once the module is booted, VREGEN acts like a standard PIO. The function of
VREGEN can be configured.
Please refer to the Melody Manual for the VREGEN function once the module is
booted.
ESD protection
The module has no supplementary ESD protection other than that provided by
the IC within the module. The Bluetooth IC ESD protection is limited to:
Human Body Model Contact Discharge per ANSI/ESDA/JEDEC JS-001
Class 2 - 2kV (all pins except CHG_EXT; CHG_EXT rated at 1kV)
Machine Model Contact Discharge per JEDEC/EIA JESD22-A115
200V (all pins)
Charged Device Model Contact Discharge per JEDEC/EIA JESD22-C101
Class II - 200V (all pins)
Sierra Wireless recommends adding supplementary ESD protection to externally
available interfaces in the end application.
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Product Technical Specification
Rev 1 Apr.17 20 41110693
Role of VREG
Once the module is booted, VREGEN acts like a standard PIO. The function of
VREGEN can be configured. Please refer to the Melody Manual for the VREGEN
function once the module is booted.
Connection Microphones
A stereo microphone example schematic is shown in Figure 4-4:
Figure 4-4: Stereo Microphone Example Schematic
Mono Microphone Example Schematic
Figure 4-5: Mono Microphone Example Schematic
Hardware Design Guidelines
Rev 1 Apr.17 21 41110693
The left channel is used for mono operation, leave the right channel unconnected.
For dual mono operation the right channel forms the auxiliary channel; connect as
per stereo example schematic.
By default mic bias will go high for a hands-free and for a music connection. The
behavior of Mic Bias can be configured. Please refer to the Melody UART manual
for configuration options.
Mic bias is 2.6V and can source up to 2.8mA of current. Melody fixes it at a
certain voltage. Please refer to the manual. The microphone input goes into a
buffer stage so its input resistance is high.
Connecting Speakers
The analogue output is not AC coupled. The analogue output circuit comprises a
DAC, a buffer with gainsetting, a low-pass filter, and a class AB output stage
amplifier. The output is available as a differential signal between SPKR_LN and
SPKR_LP for the left channel, and between SPKR_RN and SPKR_RP for the
right channel. The amplifiers expect a load impedance of 16 to 32 Ohms. Peak
voltage output depends on the gain setting though one should expect nothing
more than a peak to peak voltage of 1.5V with a DC offset of around 1.2V at
maximum gain.
External Amplifier Support
On the BC127/BC127-HD/BC127-EXT (non MFI builds), PIO3 goes high when an
audio link is active. That PIO can be used for turning ON and OFF an external
amplifier.
The BC127/BC127-HD/BC127-EXT is designed to provide direct speaker drive
however in the case where higher audio power is required, the BC127/BC127-
HD/BC127-EXT can drive an external amplifier.
The BC127/BC127-HD/BC127-EXT speaker outputs are DC coupled to the
Bluetooth IC internal to the module. The speaker outputs are referenced to 1.8V.
Sierra Wireless recommends connecting the BC127/BC127-HD/BC127-EXT to
an external amplifier in a differential configuration for enhanced noise immunity. In
this configuration common mode noise is rejected by the amplifier configuration.
In many applications supply noise can significantly degrade audio performance so
supplying filtering and layout grounding is essential to gain best performance in
audio applications. This is especially important in USB powered applications or
where a USB source is used to charge a battery powered applications, USB
supplies vary significantly with noise levels and supply stability. Good grounding
and isolation of noise ground currents is essential for superior audio applications.
In addition to steady state noise levels from USB supplies, the plugging and
unplugging of USB chargers can cause large supply transients that ripple through
the supply chain to cause clicking and popping in the audio domain. Sierra
Wireless recommends following good noise immunity pcb design practices,
ground isolation, short residual current return paths and the use of ferrite bead
and large decoupling capacitors on USB supply connections.
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Product Technical Specification
Rev 1 Apr.17 22 41110693
An example USB supply configuration is shown Figure 4-6:
Figure 4-6: Example USB Supply Configuration
The BC127/BC127-HD/BC127-EXT Discovery Board and the BC127/BC127-HD/
BC127-EXT Development Board use an external amplifier for audio application
demonstration purposes. For superior audio performance always follow the
design and layout guidelines provided by the amplifier manufacturer.
Always use a high quality audio amplifier ideally with click and pop suppression
circuits built in. These amplifiers use noise suppression and soft start techniques
to filter supply noise and transients as well as minimising ground loop currents
and DC offsets that can cause degraded audio effects. Some amplifiers even
employ ground sensing and suppression techniques to minimise and remove
noise coupling to the audio path.
In the example amplifier circuit below, the amplifier audio ground is connected to
the main ground via a single “star” point at the audio output jack. This is suitable
for connection to headphones where noise from an external source is not
expected. This circuit is used on the BC127/BC127-HD/BC127-EXT Development
Board.
Figure 4-7: Example External Audio Amplifier Connection Suitable for Connecting to External
Headphones
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Hardware Design Guidelines
Rev 1 Apr.17 23 41110693
No two audio amplifiers are the same so it is important to ensure that you follow
the design recommendations provided by the supplier of the amplifier.
When connecting to external devices such as laptops in a “line In” configuration,
there is a possibility that the sleeve of the audio cable can carry noise derived
from the laptop. Also external devices connected through the audio cable sleeve
can have different ground potentials which causes currents to flow through the
sleeve ground. In this case it is important to isolate the sleeve ground from the
audio amplifier to avoid the noise coupling to the amplifier and degrading the
signal source. In this case add a filter circuit or ferrite bead connecting the sleeve
ground to the ground on the application board as shown in Figure 4-7 below.
Figure 4-8: Isolating the Sleeve Ground from the Amplifier
Some amplifiers do not support “capless” operation and require AC coupling on
the input and output of the amplifier. Series capacitance can introduce clicks and
pops during turn off and turn on as voltage transients occur across the capacitors
causing audible spikes on the audio output.
Choice of capacitors used in these configurations is important; avoid using
ceramic capacitors as these tend to have high voltage coefficients. Use low
voltage coefficients capacitors such as tantalum or electrolytic capacitors to
reduce low frequency distortion effects.
In differential mode the tolerance of the source and feedback resistors which set
the gain of an amplifier is important. 1% resistors give a 40dB CMRR whereas
0.1% resistors give a 60dB CMRR. Use 0.1% resistor arrays for even better
performance.
The BC127/BC127-HD/BC127-EXT can be used to drive amplifiers in a single
ended format. Simply terminate the +ve differential outputs directly to the audio
ground. An example of a single ended connection is shown below.
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Product Technical Specification
Rev 1 Apr.17 24 41110693
External Speaker Connections
In some versions of the BC127/BC128, the speaker lines SPKR_LN, SPKR_LP,
SPKR_RN & SPKR_RP were internally DC blocked by 100nF capacitors on the
module. This limited the low frequency response of the audio output. A new
BC127 (V4 and above still to be released) will have these capacitors removed. So
external series capacitors are now required on the four audio output lines
mentioned above.
Select the capacitor values based on the low frequency response you wish to
achieve in your application. 1uF would be a typical suggested value.
Figure 4-9: External Series Capacitance Required for Speaker Output Connects
Figure 4-10: Isolation
Hardware Design Guidelines
Rev 1 Apr.17 25 41110693
GPIO and UART
The BC127/BC127-HD/BC127-EXT is controlled by GPIOs. This can be
configured. If GPIO control is not used, these GPIOs should be left floating. The
UART by default does not use RTS/CTS flow control. If the users do not expect to
use it, these lines should be left floating.
Digital Pin States on Reset or After Power Up
The following table shows the Digital Pin States on Reset or after power up.
PD = Pull Down, PU = Pull Up
Table 4-2: Digital Pin States on Reset or after Power up
Pin Name/Group I/O Type State after Power Up or
Reset
USB_DP Digital bi-directional N/A
USB_DN Digital bi-directional N/A
UART_RX Digital bi-directional with PU Strong PU
UART_TX Digital bi-directional with PU Weak PU
UART_CTS Digital bi-directional with PD Weak PD
UART_RTS Digital bi-directional with PU Weak PU
SPI_CS# Digital input with PU Strong PU
SPI_CLK Digital input with PD Weak PD
SPI_MISO Digital tri-state output with PD Weak PD
SPI_MOSI Digital input with PD Weak PD
SPI_PCM# Digital bi-directional with PD Strong PD
PCM_IN Digital bi-directional with PD Weak PD
PCM_OUT Digital bi-directional with PD Weak PD
PCM_SYNC Digital bi-directional with PD Weak PD
PCM_CLK Digital bi-directional with PD Weak PD
RST# Digital input with PU Strong PU
PIO[7:0] Digital bi-directional with PD Weak PD
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Product Technical Specification
Rev 1 Apr.17 26 41110693
BC127 and BC127-HD With External
Supply
Figure 4-10 shows an example of a fixed voltage configuration.
Figure 4-11: Example of Fixed Voltage Configuration
Referring to Figure 4-11 above, a 3.3V supply is connected to pins VCHG,
VBAT_SENSE, VBAT, and VDD_PADS. The minimum voltage is 3.1V to enable
the module to boot.
VCHG is the input to the battery charger regulator though in this configuration the
charging circuit is not used.
VBAT_SENSE is the input to the battery sensor circuitry, which in this
configuration is not used.
VBAT is the main supply input to the internal switch mode and LDO regulators
and supply domain for VREGEN.
Table 4-3: Input and Tri-state Currents
Input and Tri-state Currents Min Typ Max Unit
Strong pull-up -150 -40 -10 µA
Strong pull-down 10 40 150 µA
Weak pull-up -5 -1.0 -0.33 µA
Weak pull-down 0.33 1.0 5.0 µA
Hardware Design Guidelines
Rev 1 Apr.17 27 41110693
VDD_PADS is the supply to all the I/O domains for PIO, UART, PCM, LED and
RST#.
Boot Modes
Application of a voltage greater than 3.1V correctly boots the module, the module
can be powered down by removing the fixed supply voltage or by pulling
VREGEN low. If the fixed supply voltage remains, restart the module by pulling
VREGEN high.
BC127/BC127-HD/BC127-EXT to Wake-Up an
External Processor on Connection
With GPIO control disabled, the BC127/BC127-HD/BC127-EXT has PIOs that will
go high when a Bluetooth connection is established. Please refer to the Melody
Manual for more details.
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Rev 1 Apr.17 28
41110693
5
5: Power Supply Sequencing
VBAT and VDD_PADS should be driven high at the same time, VREGEN must be
delayed by at least 5ms before driving high to enable the module. RST# should be
driven low for at least 20ms to reset the module. It is not necessary to reset the
module post power up.
Figure 5-1: Power Supply Sequencing
The VBAT ramp should be monotonic, any dips in the VBAT ramp in the region of 1.6
to 3.1V may cause the module to power up incorrectly.
When using VCHG to power the module the VCHG ramp should be monotonic, any
dips in the VCHG ramp in the region of 1.6 to 3.1V may cause the module to power up
incorrectly.
Rev 1 Apr.17 29
41110693
6
6: GPIO Electrical Specifications
Table 6-1: Input and Tri-state Currents
Input and Tri-
state Currents
Min Typ Max Unit
Strong pull-up -150 -40 -10 µA
Strong pull-
down
10 40 150 µA
Weak pull-up -5 -1.0 -0.33 µA
Weak pull-
down
0.33 1.0 5.0 µA
Sink and
Source
Currents
-8 - 8 mA
250 217 no mln
Rev 1 Apr.17 30
41110693
7
7: Solder Reflow Profile
The solder profile is described below.
Figure 7-1: Solder Profile
Zone A: Preheat: This raises the temperature at a controlled rate, typically 0.5 - 2C/s.
This will preheat the component to 120°C to 150°C to distribute the heat uniformly to
the PCB.
Zone B: Equilibrium1: In this zone, the flux becomes soft and uniformly spreads
solder particles over the PCB board, preventing re-oxidisation. The recommended
temperature for this zone is 150°C to 200°C for 60s to 120s.
Zone C: Equilibrium2: This is optional and in order to resolve the upright component
issue. Temperature is 210°C to 217°C for 20s to 30s.
Zone D: Reflow zone: The temperature should be high enough to avoid wetting but
low enough to avoid component deterioration. The recommended peak temperature is
230°C to 250°C. The soldering time should be 30s to 90s when the temperature is
above 217°C.
Zone E: Cooling: The cooling rate should be fast to keep the solder grains small
which will give a longer lasting joint. A typical cooling rate is 4°C/s.
Rev 1 Apr.17 31
41110693
A
A: Regulatory Certifications
Caution: Unauthorized modifications or changes not expressly approved by Sierra Wireless
could void compliance with regulatory rules, and thereby your authority to use this equipment.
The BC127/BC127-HD/BC127-EXT module is designed to meet, and upon
commercial release, will meet the requirements of the following regulatory bodies and
regulations, where applicable:
Federal Communications Commission (FCC) of the United States
The Certification and Engineering Bureau of Industry Canada (IC)
Ministry of Internal Affairs and Communications (MIC) of Japan
Radio Equipment and Telecommunications Terminal Equipment (R&TTE)
Directive of the European Union
Upon commercial release, the following industry certification will have been obtained,
where applicable:
Bluetooth SIG
Additional certifications and details on specific country approvals may be obtained
upon customer request — contact your Sierra Wireless account representative for
details.
Additional testing and certification may be required for the end product with an
embedded BC127/BC127-HD/BC127-EXT module and are the responsibility of the
OEM. Sierra Wireless offers professional services-based assistance to OEMs with the
testing and certification process, if required.
United States - FCC
The BC127/BC127-HD/BC127-EXT module, upon commercial release, will have been
granted modular approval by the FCC. Integrators may use the BC127/BC127-HD/
BC127-EXT module in their end products without additional FCC certification if the
following conditions are met.
At least 20 cm separation distance between the antenna and the user’s body
must be maintained at all times.
The BC127/BC127-HD/BC127-EXT module must not be collocated with any other
transmitter within a host device.
The regulatory label on the end product must include the text “Contains FCC ID:
SSS-BC11X” and the following compliance statement:
This device complies with Part 15 of the FCC Rules. Operation is subject to the
following two conditions: (1) This device may not cause harmful interference,
and (2) this device must accept any interference received, including interfer-
ence that may cause undesired operation.
A user manual with the end product must clearly indicate the operating requirements
and conditions to ensure compliance with current FCC RF exposure guidelines.
The end product with an embedded BC127/BC127-HD/BC127-EXT module may also
need to meet the FCC Part 15 unintentional emission requirements and be properly
authorized per FCC Part 15 Subpart B.
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Product Technical Specification
Rev 1 Apr.17 32 41110693
Canada IC
The BC127/BC127-HD/BC127-EXT module, upon commercial release, will have
been granted modular approval by IC. Integrators may use the BC127/BC127-HD/
BC127-EXT module in their end products without additional IC certification if the
following conditions are met.
At least 20 cm separation distance between the antenna and the user’s body
must be maintained at all times.
The BC127/BC127-HD/BC127-EXT module must not be collocated with any
other transmitter within a host device.
The regulatory label on the end product must include the text “Contains IC :
11012A-BC11X” and the following compliance statement:
This device complies with Industry Canada license-exempt RSS standard(s).
Operation is subject to the following two conditions: (1) this device may not
cause interference, and (2) this device must accept any interference,
including interference that may cause undesired operation of the device.
Le présent appareil est conforme aux CNR d'Industrie Canada applicables
aux appareils radio exempts de licence. L'exploitation est autorisée aux deux
conditions suivantes: (1) l'appareil ne doit pas produire de brouillage, et (2)
l'utilisateur de l'appareil doit accepter tout brouillage radioélectrique subi,
même si le brouillage est susceptible d'en compromettre le fonctionnement.
Bluetooth Qualification Program (BQP)
In case no other non-certified Bluetooth components are incorporated, the
BC127/BC127-HD/BC127-EXT's BQP marking certification allows users to
integrate the module into products without the need to obtain subsequent and
separate approval.
The BC127/BC127-HD/BC127-EXT has been approved by the Bluetooth
Qualification Body (BQB) to use the Bluetooth trademark and to offer official
Bluetooth functionality. The approval according to the V4.0B Bluetooth speci-
fication confirms that the module complies with the Bluetooth specification
and will successfully operate with other products supporting the same profile.
BQP certification also ensures that the module has gone through safety
assessment. This certification was granted through a combination of product
performance testing and interoperability testing. This certification applies
globally.
Labelling
Products complying with all relevant requirements are allowed to bear the
official Bluetooth logo
For further information regarding the BQP certification requirements please
review the following websites:
Bluetooth Special Interest Group:
https://www.bluetooth.org/apps/content/
Rev 1 Apr.17 33
41110693
B
B: Packaging Dimensions
Main Box Dimensions
Figure 2-1: Main Box Dimensions
A=380mm
B=380mm
C=85mm
D=0mm
Product Technical Specification
Rev 1 Apr.17 34 41110693
Inside Tape and Reel Dimensions
Figure 2-2: Inside Tape and Reel Dimensions
C1=330mm
A=2.5mm
B=11mm
H=56.8mm
I=2.25mm
D=99.5mm

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