NXP Semiconductors PCF85263A Real-Time Clock (RTC) & Calendar

NXP Semiconductors PCF85263A Real-Time Clock (RTC) and Calendar is optimized for low power consumption with automatic switching to battery on main power loss. The PCF85263A 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 a clock output and two independent interrupt signals, two alarms, an I²C interface, and quartz crystal calibration.

Features

UL Recognized Component
Provides year, month, day, weekday, hours, minutes, seconds and 100th seconds based on a 32.768kHz 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
Two independent interrupt generators plus predefined interrupts at every second, minute, or hour

Frequency adjustment via programmable offset register
Clock operating voltage: 0.9V to 5.5V
Low current; typical 0.28µA at V_DD = 3.0V and Tamb = 25ºC
400kHz two-line I²C-bus interface (at V_DD = 1.8V to 5.5V)
Programmable clock output for peripheral devices (32.768kHz, 16.384kHz, 8.192kHz, 4.096kHz, 2.048kHz, 1.024kHz, and 1Hz)
Configurable oscillator circuit for a wide variety of quartzes: CL = 6pF, CL = 7pF, and CL = 12.5pF
DFN-10, TSSOP-8, and TSSOP-10 package options