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TUSB1211 Chrg_DET function.

kerr chang
Genius 4075 points
Other Parts Discussed in Thread: TUSB1211, BQ24193

We have project use Intel Bay Trail with TI TUSB1211.
TUSB1211 Pin F2 CHRG_DET in connect to TI BQ24193 Pin2 (PSEL)
Could you help to explain CHRG_DET output H and L conditions? we need check PSEL function

  • 0
    TI__Mastermind 36085 points

    Hello Kerr,

        CHRG_DET H and L conditions depend on CHRG_POL.

        If CHRG_POL is connected to GND, then CHRG_DET output pin is active low. Otherwise, when CHRG_POL is connected to VBAT then CHRG_DET output pin is active high.

       To be precisely, when CHRG_POL pin is at GND then CHRG_DET is in active low open-drain mode with external RCHRGDET(100K) connected to VBAT. When CHRG_POL pin is at VBAT then CHRG_DET is in active high open-source mode with external RCHRGDET (100K) connected to GND. This pin is 5V tolerant.

      Per Battery charging spec: In order for the Power Management Unit (PMU) to know if a portable device was attached to a charging port, the PMU would receive a signal from the PHY; it is recommended that the interface between the PHY and the PMU be an active low, open drain, charger detect signal, as shown in the following image.

    Best regards,

    Diego.