Microchip offers a complete range of Real-Time Clock/Calendar (RTCC) products, from basic clocks with minimal features to highly integrated clocks with advanced timekeeping features and non-volatile memory in a single battery-backed device. By including onboard digital trimming in all RTCCs, accurate timekeeping over temperature is possible in cost sensitive as well as high-end applications.
RTCC Development Tools
Real-Time Clock PICtail™ daughter board provides a low cost method of evaluating real-time clock functionality in standard development platforms. For additional functionality a coin cell holder and battery are included for backup power.
||Results & Benefits
|VBAT with Power-Fail Timestamp
- Separate VBAT input pin with automatic switchover to backup power
- Timestamp logs the time when VCC is lost and when it is restored
- Time and Duration of power failures are easily determined
- Dual alarms, but single output using either VCC or VBAT
- Clock output from 1 Hz to 32.768 KHz with Vcc only
- Longer MCU sleep cycles can be supported for lower overall power
- Digital circuit compensates for crystal frequency drift over temperature
- Adds and subtracts clock pulses to maintain accurate time
- Accurate timekeeping supported over temperature
|On Board Memory
- 64 Bytes SRAM, 1Kb or 2Kb EEPROM & 64 bit ID in a single RTCC
- Unique ID can be ordered blank or pre-programmed with MAC ID
- Wafer level programming: Lower cost & increased reliability of MAC ID
|Watchdog Timer (WDT)
- Dual programmable retriggers using SPI bus or digital input on WDT
- Separate hardware Reset output to MCU if WDT is not retriggered
- Robust system designs can require the WDT to be outside the MCU
|Event Detect Inputs
- A low speed input with debounce circuit for mechanical switches
- A high speed input with programmable pulse count setting
- Dual event detect inputs preserve MCU I/O pins & lower system power
How do you plan to use Real-Time Clock/Calendar in your application or design? Here are some examples of how RTCC Technology can take your applications to bigger and better places.
Smart Energy applications can use a real-time clock with a MAC address for wired and wireless communications with other devices.
Digital trimming in the real-time clock can be used to perform software temperature compensation for more accurate time.
EUI-48TM or EUI-64™ MAC Address in the RTCC can provide any Ethernet enabled application with its own unique identification.
Time of day and date from a real-time clock is regularly displayed on the LCD in many systems.