PCF8537AH/1,518 datasheet by NXP Semiconductors

PCF8537AH/1,518 Frequently Asked Questions (FAQs)

• What is the recommended power-on sequence for the PCF8537AH/1,518?
  The recommended power-on sequence is to apply VDD first, followed by VBAT. This ensures that the internal voltage regulator is enabled before the battery voltage is applied.
• How do I configure the PCF8537AH/1,518 for low-power mode?
  To configure the PCF8537AH/1,518 for low-power mode, set the PD bit in the Control Register (CR) to '1'. This will put the device in power-down mode, reducing the current consumption to a minimum.
• What is the maximum clock frequency that can be used with the PCF8537AH/1,518?
  The maximum clock frequency that can be used with the PCF8537AH/1,518 is 400 kHz. Exceeding this frequency may result in incorrect operation or damage to the device.
• How do I reset the PCF8537AH/1,518?
  The PCF8537AH/1,518 can be reset by applying a low pulse to the RST pin. The pulse width should be at least 100 ns to ensure a proper reset.
• What is the purpose of the VBAT pin on the PCF8537AH/1,518?
  The VBAT pin is used to connect a battery or a supercapacitor to the device. It provides a backup power source to the internal voltage regulator, allowing the device to maintain its internal state during power failures.