Design Files
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Accurate RTC with 512 B RAM and Battery Backup
- This page contains information on a product that is not recommended for new designs.
PCF2127 devices are "Not Recommended for New Designs", please use the replacement part PCA2131TF
The PCF2127 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 very low power consumption. The PCF2127 has 512 bytes of general-purpose static RAM, a selectable I²C-bus or SPI-bus, a backup battery switch-over circuit, a programmable watchdog function, a timestamp function, and many other features.
Product Details
Features
Key Features
- UL Recognized Component
- Operating temperature range from -40 °C to +85 °C
- Temperature Compensated Crystal Oscillator (TCXO) with integrated capacitors
- Typical accuracy:
- PCF2127AT: ±3 ppm from -15 °C to +60 °C
- PCF2127T: ±3 ppm from -30 °C to +80 °C
- Integration of a 32.768 kHz quartz crystal and oscillator in the same package
- Provides year, month, day, weekday, hours, minutes, seconds, and leap year correction
- 512 bytes of general-purpose static RAM
- Timestamp function:
- with interrupt capability
- detection of two different events on one multilevel input pin (for example, for tamper detection)
- Two line bidirectional 400 kHz Fast-mode I²C-bus interface
- 3 line SPI-bus with separate data input and output (maximum speed 6.5 Mbit/s)
- Battery backup input pin and switch-over circuitry
- Battery backed output voltage
- Battery low detection function
- Extra power fail detection function with input and output pins
- Power-On Reset Override (PORO)
- Oscillator stop detection function
- Interrupt output (open-drain)
- Programmable 1 second or 1 minute interrupt
- Programmable watchdog timer with interrupt
- Programmable alarm function with interrupt capability
- Programmable square wave output pin
- Programmable countdown timer with interrupt
- Clock operating voltage: 1.8 V to 4.2 V
- Low supply current: typical 0.70 μA at VDD = 3.3 V
Part numbers include: PCF2127AT, PCF2127T.
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Documentation
Quick reference to our documentation types.
1-5 of 13 documents
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Application Note
Application and soldering information for the PCF2127 TCXO RTC
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Application Note
ESD and EMC sensitivity of IC
Design Resources
Engineering Services
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1 engineering service
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Independent Design House (IDH)
Embedded Software Design
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