PCA9956ATWY datasheet by NXP Semiconductors

PCA9956ATWY Frequently Asked Questions (FAQs)

• What is the maximum current that can be sourced or sunk by each I/O pin?
  According to NXP's application note AN11588, each I/O pin can source or sink up to 25 mA.
• How do I implement a reset circuit for the PCA9956ATWY?
  A simple reset circuit can be implemented using a 10 kΩ resistor and a 10 μF capacitor connected to the RESET pin. This ensures that the device is properly reset during power-up.
• What is the recommended clock frequency for the PCA9956ATWY?
  The recommended clock frequency for the PCA9956ATWY is between 10 kHz and 400 kHz. However, the device can operate at frequencies up to 1 MHz, but with reduced performance.
• How do I configure the PCA9956ATWY for I2C-bus or SMBus operation?
  The PCA9956ATWY can be configured for I2C-bus or SMBus operation by setting the SCL pin high or low, respectively, during power-up. This is described in detail in the datasheet, section 7.3.
• What is the purpose of the A0, A1, and A2 address pins?
  The A0, A1, and A2 address pins are used to set the slave address of the PCA9956ATWY. By connecting these pins to VCC or GND, the device can be assigned one of eight possible slave addresses.