A simple RC circuit with a 1 kΩ resistor and a 10 μF capacitor is recommended for power-on reset. This ensures a clean reset signal during power-up.
To ensure accurate timekeeping, use a high-quality 32.768 kHz crystal oscillator, and make sure the PCB layout is designed to minimize noise and interference. Also, consider using a backup battery to maintain the RTC's timekeeping during power outages.
The maximum frequency for the clock output (CLKOUT) is 1 Hz to 32.768 kHz. However, the typical application uses a 1 Hz or 32.768 kHz clock output.
Yes, PCF8531U/2DA/1 is compatible with 5V microcontrollers. The IC's I/O pins are 5V tolerant, but the supply voltage (VCC) should be within the recommended range of 2.5V to 5.5V.
The PCF8531U/2DA/1 has a built-in battery switchover circuit. When the main power supply (VCC) fails, the IC automatically switches to the backup battery (VBAT) to maintain the RTC's operation.
