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BQ25150: Bq25150

suraj nagulamalyala
Prodigy 130 points
Part Number: BQ25150
Other Parts Discussed in Thread: BQ27426

Hello team,

 Am presently working on bq25150 battery controller,am fac

Ing an issue while charging the li-ion battery

1.Am unable to get battery regulation voltage at BAT terminals.

As default mentioned 3.6v mentioned in datasheet of bq25150.

2.but am getting 1.9v at bat terminals,what is these voltage am getting,

Is these a LDO o/p voltage or what could it be,

Even though when am disable the LDO,am getting these 1.9v at battery terminals, what could be reason..??

3.One thing to say is my bat+ and bat- terminals are connected to 

Fuel guage of bq27426,is these guage driving my battery regulation voltage..?

4.what should be configuration AND what are the registers  in ADC needed to charge Li-ion Battery..?

  • 0
    TI__Expert 4205 points

    Hello Suraj,

     

    1. The default VBAT Regulation will be 4.2V as specified on DS Pg. 50. You can set the VBATREG to be any value from 3.6V to 4.6V by updating register VBAT_CTRL (Reg Address = 0x12).
    2. Changing the LDO state would not affect the output of the BAT terminal. The BQ25150 will charge your battery up to VBATREG when charging is enable.
    3. In order to answer this I will need more information: How are you measuring the VBAT voltage? What is the status of the /CE pin on your current setup? Is there anything else (besides the gauge + battery) connected on the BAT pin? Do you have any scope captures of the battery terminals? Do you have a schematic of your current setup we can review?
    4. For starting on applications with the BQ25150 we recommend starting by using the setup guide: 
      https://www.ti.com/lit/zip/sluc679

      You can configure your system and get the right registers values based on your application using this tool. To get a starting guide with the setup guide, you can refer to: https://www.ti.com/lit/an/slua973/slua973.pdf?ts=1618237580604&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FBQ25150

     

    Best Regards,

     

    Arelis G. Guerrero

  • 0 in reply to Arelis Guerrero
    Prodigy 130 points

    3.FYI, am measuring the vbat voltage by using MULTIMETER,CE pin left floating in my schematics and CE pin should be mad low in order to charge enable,so am doing that in my S/W, but i don't know why am not getting 4.2v at bat terminals,and am checking voltage at series resistance and capacitance of BAT terminals,am not getting 4.2v,

    1.how can i get 4.2v, what configurations should i do ..?

    2.what would you prefer the configuration,is ADC need to be enabled for charging the battery,pls could you tell me,it would resolve my issue ?

  • +1 in reply to suraj nagulamalyala
    TI__Expert 4205 points

    Hi Suraj, 

    Let's follow up offline about your application. I sent you a friend request with my email. 

    Best regards, 

    Arelis G. Guerrero 

  • 0 in reply to Arelis Guerrero
    Prodigy 130 points

    3.FYI, am measuring the vbat voltage by using MULTIMETER,CE pin left floating in my schematics and CE pin should be mad low in order to charge enable,so am doing that in my S/W, but i don't know why am not getting 4.2v at bat terminals,and am checking voltage at series resistance and capacitance of BAT terminals,am not getting 4.2v,

    1.how can i get 4.2v, what configurations should i do ..?

    2.what would you prefer the configuration,is ADC need to be enabled for charging the battery,pls could you tell me,it would resolve my issue ?

  • 0 in reply to suraj nagulamalyala
    TI__Expert 4205 points

    Hello Suraj, 

    1. The default configuration of the BQ25150 is for VBAT Regulation to be 4.2V. Assuming: the battery is connected, VIN is valid, and charge is enable then the charger will charge the battery to 4.2V by default configuration of registers. You can configure the VBAT regulation to a different voltage by updating register VBAT_CTRL (Reg Address = 0x12) based on your requirements. Figure 13 of D/S shows a flow diagram of the charger behavior. 

    2. The BQ25150 is highly configurable. We recommend starting with the setup guide to select the parameters based on your battery and applications requirements. The ADC does not need to be enable for charging the battery. Section 8.3.3.3 of D/S lists the pins that are available for ADC readings. With ADC_READ_EN register you can select which channel are enabled for measurements. 

    Setup Guide: 
    https://www.ti.com/lit/zip/sluc679

    3. Do you have a scope capture of your battery terminals? Do you have a schematic capture of you configuration you can share with us? 

    Best Regards, 

    Arelis G. Guerrero