PCA9558PW,112 datasheet by NXP Semiconductors

PCA9558PW,112 Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that the PCA9558PW,112 can support?
  The PCA9558PW,112 can support I2C bus frequencies up to 400 kHz, but it is recommended to operate at 100 kHz or 400 kHz to ensure compatibility with other I2C devices.
• How do I configure the PCA9558PW,112 to operate in 8-bit or 16-bit mode?
  The PCA9558PW,112 can be configured to operate in 8-bit or 16-bit mode by setting the MODE register (address 0x03). Setting bit 0 of the MODE register to 0 enables 8-bit mode, while setting it to 1 enables 16-bit mode.
• What is the purpose of the internal pull-up resistors on the I2C bus lines?
  The internal pull-up resistors on the I2C bus lines (SCL and SDA) are used to pull the lines high when they are not being driven by the master or slave devices. This helps to prevent bus contention and ensures reliable communication.
• Can I use the PCA9558PW,112 as a level translator between 3.3V and 5V systems?
  Yes, the PCA9558PW,112 can be used as a level translator between 3.3V and 5V systems. The device can operate with a VCC supply voltage of 2.3V to 5.5V, and the I/O pins can tolerate input voltages up to 5.5V.
• How do I reset the PCA9558PW,112 to its default state?
  The PCA9558PW,112 can be reset to its default state by asserting the RESET pin low for at least 1 ms. This will reset all registers to their default values and disable the I2C interface.