PCF8562TT/S400/2,5 datasheet by NXP Semiconductors

PCF8562TT/S400/2,5 Frequently Asked Questions (FAQs)

• What is the recommended power-on reset (POR) circuit for PCF8562?
  A simple RC circuit with a 100nF capacitor and a 1kΩ resistor is recommended for power-on reset. This ensures that the device is properly reset during power-up.
• How do I handle the clock calibration process for PCF8562?
  The clock calibration process involves writing the calibration value to the CAL register (0x08). The calibration value can be calculated using the formula provided in the datasheet. It's recommended to perform calibration during manufacturing or at the start of the application.
• What is the purpose of the VBAT pin on PCF8562, and how should it be connected?
  The VBAT pin is used to connect a battery or a supercapacitor to maintain the RTC's timekeeping function during power failures. It should be connected to a battery or a supercapacitor with a voltage range of 1.5V to 3.6V.
• How do I ensure that the PCF8562's oscillator starts up correctly?
  To ensure the oscillator starts up correctly, a 100nF capacitor should be connected between the XIN pin and the XOUT pin. Additionally, the oscillator start-up time should be taken into account during system design.
• What is the maximum frequency for the clock output on PCF8562?
  The maximum frequency for the clock output on PCF8562 is 32.768 kHz. This frequency is used for the RTC's timekeeping function and can also be used as a clock source for other devices.