TCA9554DWR datasheet by Texas Instruments

TCA9554DWR Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C clock that the TCA9554DWR can handle?
  The TCA9554DWR can handle I2C clock frequencies up to 400 kHz, but it's recommended to limit it to 100 kHz for reliable operation.
• How do I handle the power-on reset (POR) of the TCA9554DWR?
  The TCA9554DWR has an internal POR circuit that resets the device during power-up. To handle POR, ensure that the VCC pin is powered up before the I2C bus is active, and wait for at least 1 ms after power-up before sending I2C commands.
• Can I use the TCA9554DWR as a level translator between 3.3V and 5V logic?
  Yes, the TCA9554DWR can be used as a level translator between 3.3V and 5V logic. The device is designed to operate with a VCC range of 1.65V to 5.5V, and the input thresholds are compatible with both 3.3V and 5V logic levels.
• How do I configure the TCA9554DWR for open-drain or push-pull output mode?
  The TCA9554DWR has a configurable output mode. To configure the output mode, write to the Configuration Register (register 0x03) and set bit 0 to 0 for open-drain mode or 1 for push-pull mode.
• What is the maximum sink current of the TCA9554DWR outputs?
  The maximum sink current of the TCA9554DWR outputs is 25 mA per pin, with a total device sink current limit of 100 mA.