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Original question:

TIDA-010216: TIDA-010216

TIDA-010216: TIDA-010216

Utku Kir
Prodigy 20 points
Part Number: TIDA-010216
Other Parts Discussed in Thread: BQ76952, CSD19536KTT

Tool/software:

In reference design file, low side mosfets and drivers part:

Could you please explain charger reverse, pack_en, ld_Wake, pack_adc and chg_wake ports? We will exclude them if they are not essential for our design.

Thank you.

Utku

  • +1
    TI__Intellectual 2330 points

    Hi Utku,

    CHG_wake: This is a wake signal connected to BQ76952 TS2 pin to wake AFE after charger attached. If you don't need charger detection, you can remove this circuit but you also need a wake up signal connected to TS2 pin. This signal can come from MCU or switch ...

    Charger reverse and Pack_adc ports: These two ports have same purpose: detect PACK- voltage. Different is pack- voltage at charger reverse is higher than short circuit. So we design two resistor divider to monitor different pack- voltage at different senerios.

    Pack_en: this is a control signal from MCU, you can enable Pack_en to monitor PACK- voltage.

    LD_wake: when load attached, LD_wake turns high to wake MCU(start ADC conversion etc.)

    BRs

    Kian

  • 0 in reply to Kian Lin
    Prodigy 20 points

    If I drive CHG and DSG pins with external PWM signal to control charging and discharging current, what is the approximate frequency for the PWM signals considering we will drive CSD19536KTT Mosfets?

  • 0 in reply to Utku Kir
    TI__Intellectual 2330 points

    Hi Utku,

    I never tried to do that. But I think there are many limitations:

    1. The voltage/current ripple your load can accept
    2. The switching loss of CSD19536KTT
    3. The MSOFET ON/OFF response time of BQ76952(I remember there have some delays between receive command with actual turning on/off)

    You may do some experiments and calculations to get a suitable switching frequency.

    BRs

    Kian