PCA9536DRG4 datasheet by Texas Instruments

PCA9536DRG4 Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that the PCA9536DRG4 can support?
  The PCA9536DRG4 can support I2C bus frequencies up to 400 kHz, but it is recommended to operate at 100 kHz or lower for reliable operation.
• How do I handle the power-on reset (POR) of the PCA9536DRG4?
  The PCA9536DRG4 has an internal POR circuit that resets the device when the supply voltage (VCC) is powered on. To handle POR, ensure that the I2C bus is idle during power-on and wait for at least 1 ms after power-on before sending commands to the device.
• What is the maximum current that can be sunk or sourced by each GPIO pin?
  Each GPIO pin of the PCA9536DRG4 can sink or source up to 25 mA of current. However, the total current sunk or sourced by all GPIO pins should not exceed 100 mA.
• How do I configure the PCA9536DRG4 for open-drain or push-pull output mode?
  The PCA9536DRG4 can be configured for open-drain or push-pull output mode by writing to the Output Mode Register (OMR). Setting OMR to 0x00 configures the device for open-drain output mode, while setting OMR to 0x01 configures it for push-pull output mode.
• What is the purpose of the internal pull-up resistors on the PCA9536DRG4?
  The internal pull-up resistors on the PCA9536DRG4 are used to pull up the GPIO pins to VCC when they are configured as inputs. This helps to prevent floating inputs and ensures that the pins are in a known state.