PCA9541PW/01,118 datasheet by NXP Semiconductors

PCA9541PW/01,118 Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that the PCA9541PW can support?
  The PCA9541PW can support I2C bus frequencies up to 400 kHz, but it's recommended to limit the frequency to 100 kHz for reliable operation.
• Can I use the PCA9541PW as a level shifter between 3.3V and 5V I2C buses?
  Yes, the PCA9541PW can be used as a level shifter between 3.3V and 5V I2C buses, but it's essential to ensure that the voltage levels on the input and output sides are within the recommended operating range.
• How do I handle the enable pin (EN) of the PCA9541PW?
  The enable pin (EN) should be tied to a logic high (VCC) to enable the device. If EN is tied to a logic low (GND), the device will be in a low-power standby mode, and the I2C bus will be disconnected.
• What is the maximum capacitance that can be driven by the PCA9541PW?
  The PCA9541PW can drive capacitive loads up to 400 pF on the SCL and SDA lines. Exceeding this limit may cause signal distortion and affect the reliability of the I2C bus.
• Can I use the PCA9541PW to connect multiple I2C masters to a single I2C bus?
  No, the PCA9541PW is designed to connect multiple I2C slaves to a single I2C master. It's not intended for use with multiple I2C masters.