PCF85363A Tiny Real Time Clock/Calendar Demonstration Board

The PCF85363A 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. Featuring clock output and two independent interrupt signals, two alarms, I²C interface and quartz crystal calibration, 64 byte battery backed-up RAM.

• UL Recognized Component (PCF85363ATL)
• Provides year, month, day, weekday, hours, minutes, seconds and 100th secondsbased 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
• Two independent interrupt generators plus predefined interrupts at every second,minute, or hour
• 64 byte battery backed-up RAM
• Frequency adjustment via programmable offset register
• Clock operating voltage: 0.9 V to 5.5 V
• Low current; typical 0.28 µA at V_DD = 3.0 V and T_amb = 25 °C
• 400 kHz two-line I²C-bus interface (at V_DD = 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: C_L = 6 pF, C_L = 7 pF, andC_L = 12.5 pF