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Original question:

BQ25713EVM-017: BQ25713EVM

BQ25713: BQ25713

Gavin OConnor
Prodigy 100 points
Part Number: BQ25713
Other Parts Discussed in Thread: BQ25720EVM, BQ25720

Tool/software:

Hi There,

I have purchased a BQ25713EVM017 and can't seem to get the output voltage above 8.2v, I have attached below what I have done with the registers:

Basically I have a 3S Battery which should charge up to 12.6V with a charge current of 500mA. I have an input Voltage of 14V, please advise what I need to change in order to get the Dev Kit to work please.

Regards,

Gavin

  • 0
    TI__Mastermind 33305 points

    Hi, Gavin,

    The default 3S setting should get you to 12.6V. 

    Please follow the BQ25713EVM user guide on how to operate the device in charge mode. 

    www.ti.com/.../BQ25713EVM-017

    Regards,

    Tiger

  • 0 in reply to Tiger Zhou
    Prodigy 100 points

    Hi Tiger,

    I have re-read the EVM User guide, I can't find the default mode for 3S?, Page 9 does not show that?

    Regards,

    Gavin

  • 0 in reply to Gavin OConnor
    TI__Mastermind 33305 points

    Fullscreen 20V-BQ25713-DEFAULT-SETTINGS.txt Download 
    * Created: Fri May 14 11:06:30 CDT 2021
*
* Format: Register Name  tab Character,\t  Hexadecimal register value.
* Device: bq25713
* BQZ Container: Charger_1_00-bq25713.bqz
*
Charge Option 0	E70E
Charge Current Register	0080
Charge Voltage Register	20D0
OTG Voltage Register	0000
OTG Current Register	0000
Input Voltage Register	1D40
Minimum System Voltage	1800
Input Current Register	4100
Charge Status Register	8000
Prochot Status Register	A800
Input Current Limit In Use	4100
VBUS and PSYS Voltage Read Back	8900
Charge and Discharge Current Read Back	0000
Input Current and CMPIN Voltage Read Back	0000
System and Battery Voltage Read Back	0000
Manufacture ID and Device ID Read Back	8840
Device ID Read Back	1188
Charge Option 1	0211
Charge Option 2	02B7
Charge Option 3	0030
Prochot Option 0	4A65
Prochot Option 1	81A0
ADC Option	2000

    The default setting is stored inside the chip. When first power on, it loads its default setting. 

  • 0 in reply to Tiger Zhou
    Prodigy 100 points

    Thanks Tiger!, I will give it a go!

  • 0 in reply to Gavin OConnor
    Prodigy 100 points

    Hi Tiger, I tried the attached and got the below: 

    My Main issue is my power supply which is supply the 14V does not draw any current and the battery does not go above 7.91V, all the jumpers are in the default setting, am I doing something wrong?

  • 0 in reply to Gavin OConnor
    TI__Mastermind 33305 points

    Hi, Gavin,

    Your charge current is set to zero, or time-out by the watchdog. I would suggest disabling watchdog timer, then set charge current to a non-zero value. 

    Regards,

    Tiger

  • 0 in reply to Tiger Zhou
    Prodigy 100 points

    Thanks!, I have it working!, Do you perhaps have the default values for the BQ25720RSN?, am I also correct saying the BQ25720RSN is the Pin to Pin Compatible with the BQ25713?

  • 0 in reply to Gavin OConnor
    TI__Mastermind 33305 points

    Glad to hear that. The default register values are stored inside the part. You can also find it in the BQ25720EVM user guide. That is right, BQ25720 is pin-to-pin compatible with BQ25713, with better efficiency. 

  • 0 in reply to Tiger Zhou
    Prodigy 100 points

    Hi Tiger, I was hoping that you had another text file available that I could load into the device. I have laid out a separate PC Board with the BQ2720 but can't seem to connect to the device through I2C, and I tried to load in the BQ25713 file but it was missing the charge 4 option.

  • 0 in reply to Gavin OConnor
    TI__Mastermind 33305 points

    Fullscreen 20V-DEFAULT-SETTINGS.txt Download 
    * Created: Tue May 11 15:06:13 CDT 2021
*
* Format: Register Name  tab Character,\t  Hexadecimal register value.
* Device: bq25720
* BQZ Container: Charger_1_00-bq25720.bqz
*
Charge Option 0	E70E
Charge Current	0000
Max Charge Voltage	20D0
OTG Voltage	09C4
OTG Current	3C00
Input Voltage	0000
Min System Voltage	4200
IIN_HOST	4100
Charger Status	8000
Prochot Status	B800
IIN_DPM	4100
ADC VBUS and PSYS	CF00
ADC IBAT	0000
ADC IIN and CMPIN	0000
ADC VSYS and VBAT	0000
Manufacture ID	0040
Device ID	00E1
Charge Option 1	3300
Charge Option 2	00B7
Charge Option 3	0434
Prochot Option 0	4A81
Prochot Option 1	41A0
ADC Option	2000
Charge Option 4	0048
Vmin Active Protection	006C