PCF8563TS/4 datasheet by NXP Semiconductors

PCF8563TS/4 Frequently Asked Questions (FAQs)

• What is the recommended power-on reset (POR) timing for the PCF8563TS/4?
  The recommended POR timing is to keep the VCC pin above 1.5V for at least 100ms to ensure a reliable power-on reset.
• How do I handle the clock calibration for the PCF8563TS/4?
  The PCF8563TS/4 has an internal clock calibration mechanism. The device automatically calibrates the clock frequency during power-on reset. However, if the clock frequency drifts due to temperature or voltage changes, the device can be recalibrated by writing to the calibration register (address 0x0E).
• What is the maximum clock frequency deviation allowed for the PCF8563TS/4?
  The maximum clock frequency deviation allowed for the PCF8563TS/4 is ±5% over the entire operating temperature range (-40°C to 85°C).
• How do I reset the PCF8563TS/4 to its default settings?
  To reset the PCF8563TS/4 to its default settings, perform a power-on reset (POR) by cycling the VCC pin. This will reset all registers to their default values.
• What is the purpose of the XIN and XOUT pins on the PCF8563TS/4?
  The XIN pin is the input pin for an external clock signal, and the XOUT pin is the output pin for the clock signal. These pins can be used to connect an external crystal oscillator or to drive an external clock signal.