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TPS7B7702-Q1: SENSE1, SENSE2, ERR pin question

Yuta Kurimoto
Genius 10665 points
Part Number: TPS7B7702-Q1

Hello Team,

Customer will set the /SENSE_EN=SEN_SEL=Lo.

The SENSE1 is connected with MCU ADC, The SENSE2 is also connected with MCU ADC. The /ERR pin is connected with GPIO of MCU. 


Q1. In customer's use case, they monitor the /ERR status continuously. If the /ERR trigger to Lo, then they will check the ADC value for the SENSE1, SENSE2 pin. This is because they want to reduce the current consumption of ADC as much as possible. Is this way no problem?

Do you have any recommendation method to detect fault?

Q2. In case they monitor ADC voltage periodically(~10ms period), They don't need to monitor /ERR pin, Is it correct?.

If there any fault which can only be noticed by /ERR pin, please let me know?

Q3. Regarding with SENSE1, SENSE2 behavior, is below understanding correct?

Short circuit or current limit : Only the correspond SENSE pin output 2.4-2.65V. (For example, if CH1 is short circuit, CH2 is normal, only SENSE1 output 2.4-2.65V)

Thermal shutdown : Both SENSE1 and SENSE2 output 2.7-3V.

Output short to battery : Only the correspond SENSE pin output 3.05-3.3V.

Reverse current : Only the correspond SENSE pin output 3.05-3.3V.

Thanks,

Yuta Kurimoto

  • 0
    TI__Mastermind 23361 points

    Hi Kurimoto-san, 

    Please see my comments below your questions. 

    Q1. In customer's use case, they monitor the /ERR status continuously. If the /ERR trigger to Lo, then they will check the ADC value for the SENSE1, SENSE2 pin. This is because they want to reduce the current consumption of ADC as much as possible. Is this way no problem?

    Do you have any recommendation method to detect fault?

    This method will work, but they need to set a delay for the SENSE pin to reach to the correct voltage. Here is a plot to show you roughly how much time SENSE can reach to a targeted voltage.

    Q2. In case they monitor ADC voltage periodically(~10ms period), They don't need to monitor /ERR pin, Is it correct?.

    If there any fault which can only be noticed by /ERR pin, please let me know?

    I would still consider the check of /ERROR pin as you can see when an error happens, it will take 500us for the sense pin to charge up to indicate the error. 

    Q3. Regarding with SENSE1, SENSE2 behavior, is below understanding correct?

    Short circuit or current limit : Only the correspond SENSE pin output 2.4-2.65V. (For example, if CH1 is short circuit, CH2 is normal, only SENSE1 output 2.4-2.65V) 

    --Yes, SENSE pins are independent. 

    Thermal shutdown : Both SENSE1 and SENSE2 output 2.7-3V.

    --Yes. The thermal shutdown will turning on and off both channels at the same time. 

    Output short to battery : Only the correspond SENSE pin output 3.05-3.3V.

    --Yes.

    Reverse current : Only the correspond SENSE pin output 3.05-3.3V.

    --Yes.

    Regards, 
    Jason Song