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TPS4H160-Q1: if the TPS4H160 is directly connected to 12V,will it affect the I2C communication?

Amelie Zheng
Genius 10865 points
Part Number: TPS4H160-Q1

The TPS4H160 device is used in the hardware design to manage the power supply of the camera. Tier1 customers have not used this kind of chip before and have some concerns.

They are worried that if the TPS4H160 is directly connected to the vehicle battery 12V, the voltage change will be relatively large when the transient conduction anti-interference experiment is performed, and will it affect the transmission of communication data, such as the transmission of I2C.
Do you have any experience in this area for reference?

  • 0
    TI__Mastermind 19094 points

    Amelie,

    I2C is a digital interface and the SDA/SCL lines will be pulled up to generally the logic level of the microcontroller and attached slave devices (generally 1.8V, 3.3V or 5V). While the high side could potentially act as the upstream power supply, the 12V would likely feed into an LDO regulator or similar voltage conditioning device to feed the digital logic and be used to pull the SDA/SCL lines high for I2C communication. 

    During transient events such as a capacitive inrush the current limit of the TPS4H160-Q1 will be it and a fault will be reported by the high side switch. While a fault is being reported the software on the processor/microcontroller can take the necessary precautions to keep the proper operation of the I2C bus and attached devices.