PCA9557RGVR datasheet by Texas Instruments

PCA9557RGVR Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that the PCA9557RGVR can support?
  The PCA9557RGVR can support I2C bus frequencies up to 400 kHz.
• How do I configure the PCA9557RGVR for 8-bit or 16-bit port expansion?
  The PCA9557RGVR can be configured for 8-bit or 16-bit port expansion by setting the A0 and A1 address pins. For 8-bit expansion, tie A0 and A1 to GND. For 16-bit expansion, tie A0 to VCC and A1 to GND.
• What is the maximum current that the PCA9557RGVR can sink or source per output?
  The PCA9557RGVR can sink or source up to 25 mA per output.
• How do I reset the PCA9557RGVR?
  The PCA9557RGVR can be reset by pulling the RESET pin low for at least 1 ms.
• What is the power-on default state of the PCA9557RGVR outputs?
  The PCA9557RGVR outputs are in a high-impedance state after power-on reset.