SPI-Bus Real-Time Clock and Calendar

PCA21125

The PCA21125 is a CMOS Real-Time Clock (RTC) and calendar optimized for low-power consumption and an operating temperature up to 125 °C. Data is transferred via a Serial Peripheral Interface (SPI-bus) with a maximum data rate of 6.0 Mbit/s. Alarm and timer functions are also available with the possibility to generate a wake-up signal on the interrupt pin.

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Block Diagram

PCA21125 Block Diagram

PCA21125 Block Diagram
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Features

  • AEC Q100 compliant for automotive applications
  • Provides year, month, day, weekday, hours, minutes, and seconds based on 32.768 kHz quartz crystal
  • Resolution: seconds to years
  • Clock operating voltage: 1.3 V to 5.5 V
  • Low supply current: typical 0.8 μA at Tamb = 25 °C
  • 4-line SPI-bus with separate, but combinable data input and output
  • Serial interface at VDD = 1.6 V to 5.5 V
  • 1 second or 1 minute interrupt output
  • Freely programmable timer with interrupt capability
  • Freely programmable alarm function with interrupt capability
  • Integrated oscillator capacitor
  • Internal Power-On Reset (POR)
  • Open-drain interrupt pin

Target Applications

  • Automotive time keeping
  • Metering

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