TCA9539RTWR datasheet by Texas Instruments

TCA9539RTWR Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that the TCA9539RTWR can support?
  The TCA9539RTWR can support I2C bus frequencies up to 400 kHz.
• How do I configure the TCA9539RTWR to operate in input mode?
  To configure the TCA9539RTWR to operate in input mode, set the corresponding bit in the Input/Output Register (Register 0x02) to '1'. This will configure the pin as an input.
• What is the maximum current that the TCA9539RTWR can sink or source per pin?
  The TCA9539RTWR can sink or source up to 25 mA per pin.
• How do I reset the TCA9539RTWR?
  The TCA9539RTWR can be reset by pulling the RESET pin low for at least 1 ms. This will reset all registers to their default values.
• What is the purpose of the internal pull-up resistors on the TCA9539RTWR?
  The internal pull-up resistors on the TCA9539RTWR are used to pull up the I2C bus lines (SCL and SDA) to the supply voltage (VCC) when the device is not actively driving the bus.