PCF8523TS/1,118 datasheet by NXP Semiconductors

PCF8523TS/1,118 Frequently Asked Questions (FAQs)

• What is the recommended crystal oscillator frequency for the PCF8523?
  The recommended crystal oscillator frequency for the PCF8523 is 32.768 kHz.
• How do I configure the PCF8523 for battery-backed mode?
  To configure the PCF8523 for battery-backed mode, connect the VBAT pin to a battery, and ensure that the VCC pin is connected to a power source. The device will automatically switch to battery-backed mode when the VCC pin is powered down.
• What is the maximum clock frequency for the PCF8523's I2C interface?
  The maximum clock frequency for the PCF8523's I2C interface is 400 kHz.
• How do I reset the PCF8523?
  The PCF8523 can be reset by pulling the RST pin low for at least 1 ms. This will reset the device and clear all registers.
• What is the accuracy of the PCF8523's internal oscillator?
  The accuracy of the PCF8523's internal oscillator is ±10% over the operating temperature range of -40°C to 85°C.