PCA9542APW/DG,118 datasheet by NXP Semiconductors

PCA9542APW/DG,118 Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that the PCA9542APW/DG,118 can support?
  The PCA9542APW/DG,118 can support I2C bus frequencies up to 400 kHz, but it's recommended to limit the frequency to 100 kHz for reliable operation.
• Can the PCA9542APW/DG,118 be used as a level shifter for I2C signals?
  Yes, the PCA9542APW/DG,118 can be used as a level shifter for I2C signals, allowing communication between devices with different voltage levels.
• How do I configure the PCA9542APW/DG,118 to use a specific I2C address?
  The PCA9542APW/DG,118 has three address pins (A0, A1, and A2) that can be connected to VCC or GND to set the I2C address. The address can be calculated using the formula: 0x70 + (A2 << 2) + (A1 << 1) + A0.
• What is the maximum number of PCA9542APW/DG,118 devices that can be connected on the same I2C bus?
  The maximum number of PCA9542APW/DG,118 devices that can be connected on the same I2C bus is limited by the I2C bus capacitance and the pull-up resistor values. As a general rule, up to 8 devices can be connected on the same bus.
• Can the PCA9542APW/DG,118 be used to isolate I2C buses with different voltage levels?
  Yes, the PCA9542APW/DG,118 can be used to isolate I2C buses with different voltage levels, providing electrical isolation between the buses.