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BQ24770: BQ24770

user6232573
Prodigy 20 points
Part Number: BQ24770
Other Parts Discussed in Thread: BQSTUDIO, BQ24773, EV2400

How to use 51 series MCU to control BQ24770 ? BQ24770 datasheet only SMBUS communication protocol.Do you have a user manual  or information for this chip, which is relatively detailed and suitable for the first use of this chip?In addition, the address of charge option2 in datasheet is 0x38, but it is 0x3c on TI studio.which is right ?

  • 0
    TI__Mastermind 25800 points

    Hello, 

    I am not familiar with the 51 series MCU. The SMBus communication section of the datasheet describes the command structure that your MCU would need to follow to program the charger. So your MCU must support I2C or SMBus to operate this charger. Beyond that, you only need to follow the data packet structure shown the datasheet. 

    The Register Map in the datasheet describes each register and associated bitfields which you can use to adjust the charger's settings.

    And as far as ChargeOption2, I believe you are looking at the incorrect BQStudio file. Please make sure open the BQ24770 file, not the BQ24773. The address is 0x3C both in the datasheet and BQStudio.

    Regards,

    Joel H

  • 0 in reply to Joel Hernandez II
    Prodigy 20 points

    I confirm that the selected Partnumber is BQ24770, not BQ24773 BQStudio is also 0X3C ;

    In addition, I used EV2400 to debug BQ24770 today and found that the charging function could not be achieved. The schematic diagram is recommended for BQ24770 datasheet.Pin 28 VCC input power voltage is 12VDC, the used battery cell is 2 serial, the input current is 3.2A ;charging current is 1.024A, the min voltage is 6144 mV, and the max voltage is 9008 mV ;0x12[15] set as low ;In addition, it was found that after turn off  the power, again turn on power ,the chip returned to the factory setting.How to make the ACDRV pin of BQ24770 output high level, how to better use this chip? TKS !

  • 0 in reply to user6232573
    TI__Mastermind 25800 points

    Hello,

    You are correct. The BQStudio file is incorrect. It should be 0x38; not 0x3C. 

    I want to note that the schematic diagram is recommended for a 18V+ input. Did you adjust the ACDET resistor network such that you follow section 8.3.2 Adapter Detect and ACOK Output of the datasheet?

    Regards,

    Joel H