PCF8564ACX9/B/1,02 datasheet by NXP Semiconductors

PCF8564ACX9/B/1,02 Frequently Asked Questions (FAQs)

• What is the recommended power-on reset (POR) circuit for PCF8564?
  A simple RC circuit with a 100nF capacitor and a 1kΩ resistor is recommended for power-on reset. This ensures a clean reset signal during power-up.
• How do I handle the clock calibration process for PCF8564?
  The clock calibration process involves writing a correction value to the clock calibration register. This value can be calculated using the formula provided in the datasheet. It's recommended to perform calibration during manufacturing or at system startup.
• What is the maximum clock frequency that can be used with PCF8564?
  The maximum clock frequency that can be used with PCF8564 is 32.768 kHz. This is the typical frequency used for real-time clock applications.
• How do I ensure that the PCF8564 retains its data during power-down?
  To ensure data retention during power-down, the VBAT pin should be connected to a battery or a capacitor with a minimum capacity of 1 μF. This provides a backup power source to maintain the internal clock and data.
• What is the purpose of the VBAT pin on PCF8564?
  The VBAT pin is used to connect a battery or a capacitor that provides a backup power source to the device. This allows the internal clock and data to be retained during power-down or battery replacement.