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  • TI Thinks Resolved

BQ76PL455A-Q1: Does GPIO of BQ76PL455A-Q1 OCP and OVP function?

Part Number: BQ76PL455A-Q1

Dear Sir:

                We want to used BQ76PL455A-Q1 to do 96V(48V battery module x2) BMS application. Does BQ76PL455A-Q1 can use GPIO for UVP and OVP alarm? BTW , Our system BD as below , Does TI have some suggest to us?

Best Regard

Jason

  • what is the intent of bypassing the built-in capability of OV, UV of the bq76PL455-q1 ? you unwanted cost to the overall system! adding complexity. Adding a nMOS on the return of high-current path, can have issues, when its OPEN.

    Depending on the application and qualification, take a look at TI's BQ769x0 family for your needs too.

    hope this helps,
    vish

    Vish Nadarajah , TI, Battery Automotive Products ,Applications Engineering , Dallas, Texas USA

  • In reply to Vish Nadarajah:

    Our requirement as follow:
    1) bq76PL455-q1 Built-in Passive balance
    2) STOP DISCHARGE during any cell under-voltage (150A 150V(96V) MOSFET)
    3a) 20A charger * 1pcs install in Battery Pack(AC220V to 96VDC/20A)
    3b) 20A charger * 2pcs install in upper-module and lower-module(AC220V to 48VDC/20A)
    4a) STOP CHARGE during any cell over-voltage (20A 150V(96V) MOSFET)
    4b) STOP CHARGE during any cell over-voltage of upper-module or lower-module (20A 75V(48V) MOSFET * 2)
    5) Battery pack will split to 2 module when shipping
    6) Short circuit protection on each module

    We choice 3b+4b temporarily, because we can not found the 96VDC/20A charger right now.

    Q1) How to using built-in OV and UV of the bq76PL455 can match the requirements?
    Q2) Which batter for 3a+4a or 3b+4b?
  • In reply to Vish Nadarajah:

    How to using BQ769x0 to match to requirements?
    How to using BQ769x0 for 26-serial cells?
  • In reply to Jet Lee:

    You need to have INA to measure the current and pass on to the uC. uC to make control Mosfet.
    PL455A is just AFE with no state machine. YOu have to have uC in your block diagram.
  • In reply to Roger Hwang:

    Yes, we have uC & current sensor. uC connect to BQ76PL455A-Q1#1 with Tx/Rx/Wakeup/Fault_N.
    May I sent instruction by uC(Tx/Rx) to control GPIO of BQ76PL455A-Q1?
  • In reply to Jet Lee:

    Hi Jet,
    If I'm to understand the question correctly, the GPIO pins are programmed as INPUTS. The GPIO_xxx is located at addresses 0x78-7D. To use GPIO addressing scheme, the uC needs to set DEVCONCONFIG{ADDR_SEL}=0.

    hope this helps.

    Vish Nadarajah , TI, Battery Automotive Products ,Applications Engineering , Dallas, Texas USA

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