NXP Semiconductors

PCF85263 CMOS Real-Time Clock

NXP introduces its tiny real-time clock/calendar with alarm function, battery switch-over, time stamp input, and I²C-bus

Image of NXP's PCF85263 CMOS Real Time ClockNXP's PCF85263A is a CMOS Real-Time Clock (RTC) and calendar optimized for low-power consumption and with automatic switching to battery on main power loss. The RTC can also be configured as a stop-watch (elapsed time counter). Three time log registers triggered from battery switch-over as well as input driven events. The PCF85263A features clock output and two independent interrupt signals, two alarms, I²C interface, and quartz crystal calibration.

Features
  • UL recognized component (PCF85263ATL)
  • Provides year, month, day, weekday, hours, minutes, seconds, and 100th seconds based on a 32.768 kHz quartz crystal
  • Stop-watch-mode for elapsed time counting, from 100th seconds to 999999 hours
  • Two independent alarms
  • Battery back-up circuit
  • WatchDog timer
  • Three timestamp registers
  • Clock operating voltage: 0.9 V to 5.5 V
  • Two independent interrupt generators plus predefined interrupts at every second, minute, or hour
  • Frequency adjustment via programmable offset register
  • Low-current; typical 0.28 μA at VDD = 3.0 V and Tamb = 25°C
  • 400 kHz two-line I²C-bus interface (at VDD = 1.8 V to 5.5 V)
  • Programmable clock output for peripheral devices (32.768 kHz, 16.384 kHz, 8.192 kHz, 4.096 kHz, 2.048 kHz, 1.024 kHz, and 1 Hz)
  • Configurable oscillator circuit for a wide variety of quartzes: CL=6 pF, CL=7 pF, and CL=12.5 pF
Published: 2015-03-11