PCF5001T datasheet by Philips Semiconductors

PCF5001T Frequently Asked Questions (FAQs)

• What is the recommended operating voltage range for PCF5001T?
  The recommended operating voltage range for PCF5001T is 2.7V to 5.5V, although it can tolerate up to 6V for short periods.
• How do I ensure reliable communication between the PCF5001T and the microcontroller?
  To ensure reliable communication, use a pull-up resistor (e.g., 1kΩ) on the SCL line, and a pull-down resistor (e.g., 1kΩ) on the SDA line. Also, ensure that the microcontroller's I2C clock frequency is within the PCF5001T's specified range (100 kHz to 400 kHz).
• What is the maximum clock frequency for the PCF5001T's I2C interface?
  The maximum clock frequency for the PCF5001T's I2C interface is 400 kHz. Exceeding this frequency may cause communication errors or device malfunction.
• How do I handle the PCF5001T's power-on reset (POR) and brown-out detection (BOD) features?
  The PCF5001T has an internal POR and BOD circuitry. During power-up, the device will reset when the supply voltage reaches 2.7V. To ensure proper operation, add an external capacitor (e.g., 10nF) between VCC and GND to filter out noise and voltage spikes.
• What is the purpose of the PCF5001T's internal oscillator, and how do I use it?
  The internal oscillator is a 32.768 kHz clock source used for the real-time clock (RTC) and watchdog timer. To use it, connect the X1 and X2 pins to a 32.768 kHz crystal, and ensure that the oscillator is enabled by setting the appropriate register bits.