Accurate RTC with Battery Backup
Design Files
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Nano-Power Highly Accurate RTC with Integrated Quartz Crystal
The PCF2131 is a CMOS real time clock (RTC) and calendar with an integrated temperature compensated crystal (Xtal) oscillator (TCXO) and a 32.768 kHz quartz crystal optimized for very high accuracy and ultra-low power consumption. The PCF2131 features:
- Selectable I²C-bus or SPI-bus interfaces for full flexibility when selecting the associated MCU/MPU
- Backup battery input and switch-over circuit, allowing the RTC to keep track of the time, even when the main power supply is removed
- Calendar capabilities to keep tracking of the time from years down to 1/100 seconds
- Up to 4 timestamp registers, which can be associated to timestamp input in order to register tampering events
- Up to 2 interrupt outputs to enable/disable systems to reduce the overall current consumption
Product Details
Features
Nano-Power Device
- Clock operating voltage from 1.2 V to 5.5 V
- Supply current of 64 nA @ VDD = 3.3 V (typical)
Highly Accurate Real Timing
- ±3 ppm from -40 °C to +85 °C (typical)
- ±8 ppm from -40 °C to +85 °C (worst)
Integrated Quartz Crystal and Oscillator
- 32.768 kHz quartz crystal
- Temperature compensated crystal oscillator (TCXO)
Battery Back Up Supported
- Battery backup input pin and switch-over circuitry
- Battery backed output voltage
- Battery low detection function
Timestamp and Interrupt Functionality
- 4x Time stamp inputs with independent registers
- 2x Interrupt pin with selectable interrupt source
Multiple Interfaces Supported
- I²C-bus support (400 kHz fast-mode)
- SPI-bus (maximum speed 6.5 Mbit/s)
Calendar Capabilities
- Provide year, month, day, weekday, hours, minutes, seconds and 1/100 seconds
- Leap year correction
Product Longevity Program
- This product is included in the NXP Product Longevity Program ensuring a stable supply of products for your embedded designs. The PCF2131TF is included in the 10-year program.
Related products
Accurate RTC with 512 B RAM and Battery Backup
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Documentation
Quick reference to our documentation types.
Design Resources
Hardware
Quick reference to our
board types.
5 hardware offerings
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Evaluation and Development BoardsPCF2131/PCA2131 Arduino® Shield Evaluation BoardFeatured
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Evaluation and Development BoardsFRDM i.MX 93 Development Board
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Reference Design1500 V Battery Energy Storage Reference Design
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Software
Quick reference to our software types.
2 software files
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BSPs and Device Drivers
PCF2131 Real-Time Clock Driver with Demo App (SDK)
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BSPs and Device Drivers
PCF2131 Real-Time Clock - Application Code Hub
Note: For better experience, software downloads are recommended on desktop.