PMM-3738-VM1010-R Datasheet by PUI Audio, Inc.

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Preliminary
PUI Audio, Inc. A Projects Unlimited Company, 3541 Stop Eight Road, Dayton, OH 45414
Tel: (937) 415-5901 Fax: (937) 415-5925
Low-Noise Bottom Port
Piezoelectric MEMS Microphone
with Wake on Sound Feature
Data Sheet PMM-3738-VM1010-R
PUI Audio, with Vesper’s exclusive technology, presents the PMM-3738-VM1010-R:
The world’s first ZeroPower Listening™ piezoelectric MEMS microphone designed
for ultra-low power always listening solution; delivering voice activation to battery-
powered devices.
Features:
ZeroPower Listening technology
Full audio output on wake-up
Capable of voice detection with just 18 µW
operating power
Extends Battery life up to 10x
Dust and moisture resistant (IP test results
pending)
The PMM-3738-VM1010-R is a single-ended
analog MEMS microphone with Wake on Sound.
The Wake on Sound mode allows for detection of
voice activity while consuming only 5 µA of supply
current (9 µW of power). In Wake on Sound mode,
a sound in the vocal band above the level threshold
instantly alerts a processor of an acoustic event.
The processor (DSP or Voice Processor) then
switches the PMM-3738-VM1010-R into Normal
mode, with full audio output within 100
microseconds! Fast enough for the microphone to
capture the triggering sound and pass it along for
processing. This is the system architecture for
ZeroPower Listening.
Wake on Sound delivers voice activation to battery-
powered voice-interface consumer deviceswhile
drawing nearly zero powersuch as smart
speakers, smart TV remote controls, smart
headphones, and IoT smart home products.
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Preliminary
PUI Audio, Inc. A Projects Unlimited Company, 3541 Stop Eight Road, Dayton, OH 45414
Tel: (937) 415-5901 Fax: (937) 415-5925
Specifications
All specifications are at 25°C, VSupply = 1.8 V unless otherwise noted.
Parameter Symbol Conditions Min. Typ. Max. Units
Normal Mode Acoustic Specifications
Sensitivity 1 kHz, 94 dB SPL -41 -38 -35 dBV
Signal-to-Noise
Ratio
SNR 94 dB SPL at 1 kHz signal, 60 dB(A)
20 Hz 20 kHz, A-weighted
Noise
Signal-to Noise
Ratio Voice Band
SNR 94 dB SPL at 1 kHz signal, 62 dB(A)
20 Hz 8 kHz, A-weighted
Total Harmonic
Distortion
THD 94 dB SPL 0.1 %
Acoustic Overload
Point
AOP 10.0% THD 124 dB SPL
Roll Off Frequency -3db at 1 kHz 100 Hz
Directivity Omni
Wake on Sound Acoustic Specifications
(on material Date Code 1811 and higher)
Max Acoustic
Threshold
(default)
PaTH
Rg = Open
89 dB
SPL
Mid Acoustic
Threshold
PaTH
Rg = 90 kOhm
77 dB
SPL
Min Acoustic
Threshold
PaTH
Rg = 18 kOhm
65 dB
SPL
Supply Voltage Supply Current V S 1.8 V, Mode Normal 83 100 Power Supply PSRR 756 Power Supply PSR 787 Output Impedance Z 1000 Output DC Offset 075 Supply Voltage VDD Supply Current V S 1.8 V, Mode WoS 10 14
Preliminary
PUI Audio, Inc. A Projects Unlimited Company, 3541 Stop Eight Road, Dayton, OH 45414
Tel: (937) 415-5901 Fax: (937) 415-5925
Normal Mode Electrical Specifications
Supply Voltage
VDD
1.6
1.8
3.6
V
Supply Current
VDD 1.8 V, Mode Normal
83
100
μA
Power Supply
Rejection Ratio
PSRR
VDD = 1.8, 1kHz, 200mVPP
Sine wave
-56
dB
Power Supply
Rejection
PSR
VDD = 1.8, 217Hz, 100mVPP
square wave, 20 Hz 20kHz,
A-weighted
-87
dB(A)
Output Impedance
ZOUT
1000
Ω
Output DC Offset
0.75
V
Wake on Sound Mode Electrical Specifications
Supply Voltage
VDD
1.6
1.8
V
Supply Current
VDD 1.8 V, Mode WoS
7
10
μA
Digital Electrical Interface Specifications
Logic Input High 0.65*VDD 3.6 V
Logic Input Low -0.3 0.35*VDD V
Logic Output High ILoad = 2mA 0.7*VDD VDD V
Logic Output Low ILoad = 2mA 0 0.3*VDD V
Driving Capability 100 pF
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Preliminary
PUI Audio, Inc. A Projects Unlimited Company, 3541 Stop Eight Road, Dayton, OH 45414
Tel: (937) 415-5901 Fax: (937) 415-5925
Absolute Maximum Ratings
Parameter
Maximum
U
n
it
s
Supply Voltage
3
.
6
V
Sound Pressure Level
160
dB re 20 μPa
Temperature Range
-40 to +85
°C
Storage Temperature Range
-50 to +150
°C
Frequency Response (Normal Mode)
Environmental Robustness
IP adherence is evaluated by 1 kHz Sensitivity spec post stress
Ingress Protection Type Description
Dust Resistance IP5X
Microphone Modes
mode pin
Mic mode
Idd, typ. (µA)
Vout pin
dout p
in
high
Wake-on-Sound
10
GND
Low, then latches high
after first wake-up
event
low or
floating
Normal-Power
83
audio
output
Tied to GND through low
impedance
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Preliminary
PUI Audio, Inc. A Projects Unlimited Company, 3541 Stop Eight Road, Dayton, OH 45414
Tel: (937) 415-5901 Fax: (937) 415-5925
Microphone
Operation
The PMM-3738-VM1010-R is a user-controlled, multi-mode microphone. Through the single
bit digital input pin mode, the user provides a signal that will put the microphone into Wake on Sound or
Normal modes of operation. When in the Wake on Sound mode, should a sound be detected, the
microphone will output a digital high through the dout pin. The user can then switch the microphone to
Normal mode by providing a digital low to the mode pin. The user would at some later point, provide a
digital high to the mode pin to return the microphone to Wake on Sound mode. Figure 2 shows the states
of various pins that are either user provided (mode, Vdd) or PMM-3738-VM1010-R provided (dout, Vout)
at three points of operation.
Figure 2: Timing diagrams showing turn-on time (left), transition time
i
nt
o
Wake on Sound mode (center) & Normal mode
(righ
t)
It is recommend to power up the microphone in Normal mode (mode pin low), and then enter into
WoS mode as needed.
Product Revision Technical Update
The PMM-3738-VM1010-R has been updated with a wider Wake on Sound range, on parts date
code 1811 and higher, giving designers more configurability in the acoustic threshold and
allowing for ZeroPower Listening to be used in more applications. Previously, this range was from
65 to 78 dB SPL. On parts date code 1811 and higher, this range has been extended from 65 dB to
89 dB SPL.
To accommodate this change, users simply need to change the Rg (GA1 to GA21 external resistor)
value. See the table below for the value of Rg to use to configure the turn-on threshold.
Vdd (1,8V) yIL? OpEnCondItI'on: 0— Default Thresho/d 0— —>0— Sound ) > Vdd :2; am mode Vout VMlOlO Microphone ’WakeVup’ dIgital Input -0—>— Analog Output .0— ‘Mode cunt/0W dIgI'ra/ output DSP or Voice Processor ADC Wll‘h MIC preamp 1
Preliminary
PUI Audio, Inc. A Projects Unlimited Company, 3541 Stop Eight Road, Dayton, OH 45414
Tel: (937) 415-5901 Fax: (937) 415-5925
System Architecture
A. Control loop for Wake-on-Sound:
Figure 3: Block diagram of example system built a
r
ou
nd the
PMM-3738-VM1010- R
microphone
In the figure above, the PMM-3738-VM1010-R microphone wakes up the system when triggered
by sound. The DSP or Voice Processor can be kept in a low-power state when there is no sound to
process.
Temperature 2°C/ Typical Solder Reflow Profile 260°C, 405 2“C/s 150°C, 605 3°C/s Time
Preliminary
PUI Audio, Inc. A Projects Unlimited Company, 3541 Stop Eight Road, Dayton, OH 45414
Tel: (937) 415-5901 Fax: (937) 415-5925
Solder Reflow Profile
Handling Instructions
PUI Audio’s piezoelectric MEMS microphones are very robust to harsh environments such as dust and
moisture. However, to avoid mechanical damage to the microphone, we recommend using
appropriate handling procedures when manually handling the parts or when using pick and place
equipment. The following guidelines will help to avoid damage:
Do not apply a vacuum to the bottom side of the microphone. A vacuum pen may be used with
care on the top side only.
Do not apply very high air pressure over the port hole.
Do not insert any large particles or objects in the port hole. The microphone is robust to small
particles per IP5x specification.
Do not board wash or clean after the reflow process or expose the acoustic port to harsh
chemicals.
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Preliminary
PUI Audio, Inc. A Projects Unlimited Company, 3541 Stop Eight Road, Dayton, OH 45414
Tel: (937) 415-5901 Fax: (937) 415-5925
Dimensions and Pin Layout
Pin Number
Pin Name
Description
1
Vout
Analog Output Voltage
2
GA2
Wake-on-Sound Acoustic Threshold Adjust pin 2
3
GA1
Wake-on-Sound Acoustic Threshold Adjust pin 1
4
GND
Ground
5
mode
Mode control (hi=Wake-on-Sound, lo=Normal-
Power)
6
Vdd
Power Supply (1.6V to 3.6V)
7
dout
Digital output for Wake-on-Sound trigger
8
GND
Ground
Engineering Samples
Engineering samples may vary from the technical specifications contained in this data sheet, are not
intended for use in end-products, and are intended for evaluation and testing, only. The performance
of an engineering sample may not reflect the performance of a final product.
Bottom View
Revision Description Date Preliminar Released from Engineering 6 1 2017 A Revised Pm Numbers on Drawing 6/26/2017 mensions on B 4,5,and6 3 14 2017 c 5 23 2013
Preliminary
PUI Audio, Inc. A Projects Unlimited Company, 3541 Stop Eight Road, Dayton, OH 45414
Tel: (937) 415-5901 Fax: (937) 415-5925
Specifications Revisions
Revision
Description
Date
Preliminary
Released from Engineering
6/1/2017
A
Revised Pin Numbers on Drawing
6/26/2017
B
Revised Dimensions on Pins 1, 2, 3,
4, 5, and 6
8/14/2017
C
Revised current draw, added
storage temperature ratings, and
added Product Revision Technical
Update on page 5 regarding Wake
on Sound range
5/23/2018
Note:
1. All dimensions are in millimeters.
2. Specifications subject to change or withdrawal without notice.
3. This part is RoHS 2011/65/EU Compliant.

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