PCA9536D datasheet by NXP Semiconductors

PCA9536D Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that the PCA9536D can support?
  The PCA9536D can support I2C bus frequencies up to 400 kHz, but it is recommended to operate at 100 kHz or lower for reliable operation.
• How do I handle the case where the PCA9536D is not responding to I2C commands?
  If the PCA9536D is not responding to I2C commands, try resetting the device by toggling the RESET pin low and then high. Also, check the I2C bus for any bus contention or noise issues.
• Can I use the PCA9536D to drive inductive loads such as relays or solenoids?
  No, the PCA9536D is not designed to drive inductive loads. It is recommended to use an external driver or buffer to drive inductive loads. The PCA9536D is suitable for driving resistive loads such as LEDs or switches.
• How do I determine the correct pull-up resistor value for the I2C bus?
  The pull-up resistor value depends on the I2C bus frequency, bus capacitance, and the number of devices on the bus. A good starting point is to use a 2.2 kΩ pull-up resistor for a 100 kHz I2C bus frequency. Adjust the value based on the specific application requirements.
• Can I use the PCA9536D to implement a level shifter for 5V to 3.3V or vice versa?
  No, the PCA9536D is not designed to be used as a level shifter. It is recommended to use a dedicated level shifter IC or a voltage translator IC for level shifting applications.