Clock & Timer IC

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PCA85073A CMOS Real-Time Clock/Calendar is an automotive-grade RTC, optimized for low power consumption. An offset register allows fine-tuning of the clock. All addresses and data are transferred serially via the two-line bidirectional I2C-bus. The PCA85073A features a maximum data rate of up to 400kbit/s. The register address is incremented automatically after each written or read data byte.


  • AEC-Q100 grade 2 compliant for automotive applications
  • Provides year, month, day, weekday, hours, minutes, and seconds based on a 32.768kHz quartz crystal
  • Low current; typical 0.25µA at VDD = 3.0V and Tamb = +25°C
  • Programmable clock output for peripheral devices (32.768kHz, 16.384kHz, 8.192kHz, 4.096kHz, 2.048kHz, 1.024kHz, and 1.0Hz)
  • Alarm function
  • Minute and half minute interrupt
  • Internal Power-On Reset (POR)
  • -40°C to +105°C operating temperature range
  • 0.9V to 5.5V clock operating voltage
  • 400kHz two-line I2C-bus interface (at VDD = 1.8V to 5.5V)
  • Selectable integrated oscillator load capacitors for CL = 7pF or CL = 12.5pF
  • Countdown timer
  • Oscillator stop detection function
  • Programmable offset register for frequency adjustment
  • Latch-up performance exceeds 100mA per JESD 78, Class II
  • ESD protection exceeds JESD 22
    • 4000V Human-Body Model (A114-A)
    • 1000V Charged-Device Model (C101)
  • TSSOP-8 package


  • Accurate timing
  • Air conditioning
  • Body control and battery management
  • Center stack
  • Dashboard
  • Infotainment
  • Telematics
  • Tracking time of the day