PCF8566TS/1,118 datasheet by NXP Semiconductors

PCF8566TS/1,118 Frequently Asked Questions (FAQs)

• What is the recommended power-on reset (POR) circuit for PCF8566TS/1,118?
  A simple RC circuit with a 1 kΩ resistor and a 10 μF capacitor is recommended to ensure a clean power-on reset. This circuit helps to prevent the device from malfunctioning during power-up.
• How do I handle the clock calibration process for PCF8566TS/1,118?
  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 essential to follow the recommended calibration procedure to ensure accurate clock operation.
• What is the purpose of the CLKOUT pin on PCF8566TS/1,118, and how do I use it?
  The CLKOUT pin provides a clock output signal that can be used to drive other devices. The clock frequency can be set to 32.768 kHz, 1 Hz, or 1 kHz using the CLKOUT control register (0x0F). This pin can be used to synchronize other devices or to provide a clock signal for other applications.
• How do I implement a battery-backed real-time clock (RTC) using PCF8566TS/1,118?
  To implement a battery-backed RTC, connect a battery to the VBAT pin and ensure that the device is powered from the battery when the main power supply is absent. The PCF8566TS/1,118 will automatically switch to battery power when the main power supply is lost, allowing the RTC to continue operating.
• What is the maximum clock accuracy that can be achieved with PCF8566TS/1,118?
  The PCF8566TS/1,118 can achieve a clock accuracy of ±2 minutes per year at 25°C, making it suitable for most RTC applications. However, the actual accuracy may vary depending on the crystal oscillator used and the operating conditions.