InetrfaceProducts NXP / PCF2127

PCF2127 and PCF2129 are high accuracy real-time-clock (RTC) module. This library provides simple interface to accessing clock information.

Dependents:   PCF2127_Demo PCF2127_Hello

PCF2127 and PCF2129

PCF2127T is in SO16 package

The PCF2127 and the PCF2129 are 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.
Both of PCF2127 and PCF2129 have a selectable I2C-bus or SPI-bus, a backup battery switch-over circuit, a programmable watchdog function, a timestamp function, and many other features.
On addition to this, the PCF2127 has 512 bytes of general-purpose static RAM.

These 4 types of RTC modules are software compatible. So this library "PCF2127" can be used all of those.
This library only supports I²C to communicate with the PCF2127/PCF2129.

Type variations

Main feature difference

Pin assign

PCF2127T

Connection between MCU and PCF2127/PCF2129

These examples show how the RTC module can be connected via I²C bus.

References

• Datasheet
  • PCF2127T and PCF2127AT
  • PCF2129T
  • PCF2129AT
• User manual
  • Demo board OM13513
• Other information PCF2127
  • PCF2129T
  • PCF2129AT