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BQ25708: Can not make it work without battery.

Anatoly Dobreen
Prodigy 110 points
Part Number: BQ25708
Other Parts Discussed in Thread: EV2400, BQSTUDIO, BQ25700A

Hi all.

I have some trouble with BQ25708 design. Added schematic.

It work good with connected battery. Battery charge ok.

But I can not make it work without battery.
It not started, I have about 1V at Vsys, so my 5V converter not worked.
(but I have 6V at REGN and VDDA)

Chip in default state, no write to registers, only CELL_BATPRESZ pin connected to GND (for case without battery)

Thanks advance.

AnatolyBQ25708RSNT - test board.pdf

  • 0
    TI__Genius 13605 points

    Anatoly,

    Actually,

    DC/DC should operate whatever battery existed or not. So could you help me to double check below signal?

    1. What is voltage in REGN pin?

    2. Could you measure input voltage, SYS voltage and system current waveform to check?

    From your circuit, I find there some items need to modify.

    3. please change R67/R43/R38/R39 resistor value from 100ohm to 10ohm

    4. Change C12/C29 capacitor value to 47nF

    5. Please keep your input voltage max value is 24V because of our recommend operation max voltage is 24V

    6. what is your JP2/3/4 jumper status?

    Thanks

  • 0 in reply to Paul Yeh
    Prodigy 110 points

    Hi Paul.

    Thanks for reply. We changed resistors and capacitors according points 3 and 4

    But this no have fundamental difference. It still not work as needed. We have tested several boards 

    "1. What is voltage in REGN pin?"

    6V at all boards

    2. Could you measure input voltage, SYS voltage and system current waveform to check?

    Added waveform from good board (Blue - 24V, yellow - Vsys) . At other board it all flat, nothing really moving.

     

     

    "3. please change R67/R43/R38/R39 resistor value from 100ohm to 10ohm

    4. Change C12/C29 capacitor value to 47nF"

    This done

    "5. Please keep your input voltage max value is 24V because of our recommend operation max voltage is 24V"

    Sure

     

    "6. what is your JP2/3/4 jumper status?"

    For waveform that was done. Only JP4 set (battery not connected). Remove JP4 stop oscillating (Goes dead). Move to JP3 - still dead (without battery)
    after add battery, starts up.

    I was thinking that problem can be in 24V source, but even if we using external adjustable power supply (tried 24V and 18V) nothing changed.

    Additional question, what must be default Vsys voltage? (without battery, JP4 set, after reset state)?


    Thanks.

    Regards, Anatoly

  • 0 in reply to Anatoly Dobreen
    TI__Genius 13605 points

    Anatoly,

    For 4cell design and no battery condition, the min system voltage should be 12.288V.

    Do you isolate system loading, just no load condition to see does system voltage ramp up or not?

    BTW, could you also send your register setting log file to me I would like to check your initial setting?

    Thanks

  • 0 in reply to Paul Yeh
    Prodigy 110 points

    Hi Paul. Thanks for help.

    Sorry for delay with reply. We have bought and waited for delivery EV2400 to read and write setup registers at BQ25708.

    Comment. Since I did not found configuration file for BQ25708 at latest BQSTUDIO,

    I used setup for BQ25700A (As I understand it almost same) from this topic https://e2e.ti.com/support/power-management/f/196/t/611912

    I made this setup procedure:

    set max system voltage regulation // REG0x15() = 0x3130H (12.592 V)
    set min system voltage regulation //REG0x3E() = 0x3000H (12.288V)
    set Input current regulation at 1.5A // REG0x3F() = 0x1DFFH
    set charge voltage regulation // REG0x15() = 0x3130H (12.592V)
    set charge current regulation in fast charge // REG0x14() = 0x0400H (1024mA)
    set charge current regulation in LDO mode // REG0x14() = 0x00C0H (192mA)

    and  set bit 5 in "Input current limit in Use" register 0x22  (1 = Adds 1600 mA of input current)

    Please take a look what we have from registers at the moment. Added log files.

    Batt Connected 12.27 J3 output ok 

    * Created: Thu Oct 18 12:41:56 EDT 2018
    *
    * Format: Register Name tab Character,\t Hexadecimal register value.
    * Device: bq25700A
    * BQZ Container: Charger_1_00-bq25700A.bqz
    *
    Charge Option 0 E20E
    Charge Current Register 0000
    Charge Voltage Register 1060
    OTG Voltage Register 0000
    OTG Current Register 0000
    Input Voltage Register 1780
    Minimum System Voltage 0E00
    Input Current Register 4100
    Charge Status Register A010
    Prochot Status Register 0000
    Input Current Limit In Use 4100
    VBUS and PSYS Voltage Read Back 7200
    Charge and Discharge Current Read Back 0000
    Input Current and CMPIN Voltage Read Back 0000
    System and Battery Voltage Read Back 0000
    Manufacture ID Read Back 0040
    Device ID Read Back 007C
    Charge Option 1 0210
    Charge Option 2 02B7
    Charge Option 3 0000
    Prochot Option 0 4A54
    Prochot Option 1 8120
    ADC Option 2000

    23v in Jumper on J4 No Batt No Out

    * Created: Thu Oct 18 12:41:02 EDT 2018
    *
    * Format: Register Name tab Character,\t Hexadecimal register value.
    * Device: bq25700A
    * BQZ Container: Charger_1_00-bq25700A.bqz
    *
    Charge Option 0 E20E
    Charge Current Register 0000
    Charge Voltage Register 3130
    OTG Voltage Register 0000
    OTG Current Register 0000
    Input Voltage Register 1780
    Minimum System Voltage 2400
    Input Current Register 4100
    Charge Status Register A010
    Prochot Status Register 0000
    Input Current Limit In Use 4100
    VBUS and PSYS Voltage Read Back 7200
    Charge and Discharge Current Read Back 0000
    Input Current and CMPIN Voltage Read Back 0000
    System and Battery Voltage Read Back 0000
    Manufacture ID Read Back 0040
    Device ID Read Back 007C
    Charge Option 1 0210
    Charge Option 2 02B7
    Charge Option 3 0000
    Prochot Option 0 4A54
    Prochot Option 1 8120
    ADC Option 2000

    "Do you isolate system loading, just no load condition to see does system voltage ramp up or not?"

    Even with min loading only 5V converter without 5V load (to disconnect this converter I need cut tracks at PCB, I want avoid this at the moment),

    system voltage drop from 12V to 1V, when we disconnect battery.

    Just in case I added one more log.

    log.log 
    Thu Oct 18 12:37:31 EDT 2018

Device Name = bq25700A
Firmware Version = 1.00


Sample,DateTime,ElapsedTime,Charge_Option_0,Charge_Current_Register,Charge_Voltage_Register,OTG_Voltage_Register,OTG_Current_Register,Input_Voltage_Register,Minimum_System_Voltage,Input_Current_Register,Charge_Status_Register,Prochot_Status_Register,Input_Current_Limit_In_Use,VBUS_and_PSYS_Voltage_Read_Back,Charge_and_Discharge_Current_Read_Back,Input_Current_and_CMPIN_Voltage_Read_Back,System_and_Battery_Voltage_Read_Back,Manufacture_ID_Read_Back,Device_ID_Read_Back,Charge_Option_1,Charge_Option_2,Charge_Option_3,Prochot_Option_0,Prochot_Option_1,ADC_Option,LogRowTime(ms),LogStatus
1,2018-10-18 12:37:35,4.004,,0000,1060,0000,0000,1AC0,0E00,4100,A010,0000,4100,7F00,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,404,ERROR : Please check C:\Users\Documents\Enventys\Wincor\log.log.err
2,2018-10-18 12:37:39,8.002,E20E,0000,1060,0000,0000,1AC0,0E00,4100,A010,0000,4100,7F00,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,361,SUCCESS
3,2018-10-18 12:37:43,12.002,E20E,0000,1060,0000,0000,1AC0,0E00,4100,A010,0000,4100,7F00,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,359,SUCCESS
4,2018-10-18 12:37:47,16.003,E20E,0000,1060,0000,0000,1AC0,0E00,4100,A010,0000,4100,7F00,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,360,SUCCESS
5,2018-10-18 12:37:51,20.003,E20E,0000,1060,0000,0000,1AC0,0E00,4100,A010,0000,4100,7F00,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,352,SUCCESS
6,2018-10-18 12:37:55,24.004,E20E,0000,1060,0000,0000,1AC0,0E00,4100,A010,0000,4100,7F00,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,358,SUCCESS
7,2018-10-18 12:37:59,28.004,E20E,0000,1060,0000,0000,1AC0,0E00,4100,A010,0000,4100,7F00,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,358,SUCCESS
8,2018-10-18 12:38:03,32.005,E20E,0000,1060,0000,0000,1AC0,0E00,4100,A010,0000,4100,7F00,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,357,SUCCESS
9,2018-10-18 12:38:07,36.005,E20E,0000,1060,0000,0000,1AC0,0E00,4100,A010,0000,4100,7F00,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,356,SUCCESS
10,2018-10-18 12:38:11,40.006,E20E,0000,1060,0000,0000,1AC0,0E00,4100,A010,0000,4100,7F00,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,357,SUCCESS
11,2018-10-18 12:38:15,44.007,E20E,0000,1060,0000,0000,1AC0,0E00,4100,A010,0000,4100,7F00,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,354,SUCCESS
12,2018-10-18 12:38:19,48.006,E20E,0000,1060,0000,0000,1AC0,0E00,4100,A010,0000,4100,7F00,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,356,SUCCESS
13,2018-10-18 12:38:23,52.007,E20E,0000,1060,0000,0000,1AC0,0E00,4100,A010,0000,4100,7F00,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,356,SUCCESS
14,2018-10-18 12:38:27,56.007,E20E,0000,1060,0000,0000,1AC0,0E00,4100,A010,0000,4100,7F00,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,354,SUCCESS
15,2018-10-18 12:38:31,60.007,E20E,0000,1060,0000,0000,1AC0,0E00,4100,A010,0000,4100,7F00,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,354,SUCCESS
16,2018-10-18 12:38:35,64.008,E20E,0000,1060,0000,0000,1AC0,0E00,4100,A010,0000,4100,7F00,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,353,SUCCESS
17,2018-10-18 12:38:39,68.009,E20E,0000,1060,0000,0000,1AC0,0E00,4100,A010,0000,4100,7F00,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,354,SUCCESS
18,2018-10-18 12:38:43,72.009,E20E,0000,1060,0000,0000,1AC0,0E00,4100,A010,0000,4100,7F00,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,352,SUCCESS
19,2018-10-18 12:38:47,76.010,E20E,0000,1060,0000,0000,1AC0,0E00,4100,A010,0000,4100,7F00,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,353,SUCCESS
20,2018-10-18 12:38:51,80.010,E20E,0000,1060,0000,0000,1AC0,0E00,4100,2010,0000,4100,7F00,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,351,SUCCESS
21,2018-10-18 12:38:55,84.011,E20E,0000,3130,0000,0000,1780,2400,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,351,SUCCESS
22,2018-10-18 12:38:59,88.011,E20E,0000,3130,0000,0000,1780,2400,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,351,SUCCESS
23,2018-10-18 12:39:03,92.012,E20E,0000,3130,0000,0000,1780,2400,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,351,SUCCESS
24,2018-10-18 12:39:07,96.012,E20E,0000,3130,0000,0000,1780,2400,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,350,SUCCESS
25,2018-10-18 12:39:11,100.012,E20E,0000,3130,0000,0000,1780,2400,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,366,SUCCESS
26,2018-10-18 12:39:15,104.013,E20E,0000,3130,0000,0000,1780,2400,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,365,SUCCESS
27,2018-10-18 12:39:19,108.013,E20E,0000,3130,0000,0000,1780,2400,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,364,SUCCESS
28,2018-10-18 12:39:23,112.014,E20E,0000,3130,0000,0000,1780,2400,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,365,SUCCESS
29,2018-10-18 12:39:27,116.015,E20E,0000,3130,0000,0000,1780,2400,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,363,SUCCESS
30,2018-10-18 12:39:31,120.015,E20E,0000,3130,0000,0000,1780,2400,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,363,SUCCESS
31,2018-10-18 12:39:35,124.016,E20E,0000,3130,0000,0000,1780,2400,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,360,SUCCESS
32,2018-10-18 12:39:39,128.016,E20E,0000,3130,0000,0000,1780,2400,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,362,SUCCESS
33,2018-10-18 12:39:43,132.017,E20E,0000,3130,0000,0000,1780,2400,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,360,SUCCESS
34,2018-10-18 12:39:47,136.017,E20E,0000,3130,0000,0000,1780,2400,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,361,SUCCESS
35,2018-10-18 12:39:51,140.018,E20E,0000,3130,0000,0000,1780,2400,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,360,SUCCESS
36,2018-10-18 12:39:55,144.018,E20E,0000,3130,0000,0000,1780,2400,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,359,SUCCESS
37,2018-10-18 12:39:59,148.018,E20E,0000,3130,0000,0000,1780,2400,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,360,SUCCESS
38,2018-10-18 12:40:03,152.019,E20E,0000,3130,0000,0000,1780,2400,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,359,SUCCESS
39,2018-10-18 12:40:07,156.019,E20E,0000,3130,0000,0000,1780,2400,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,360,SUCCESS
40,2018-10-18 12:40:11,160.019,E20E,0000,3130,0000,0000,1780,2400,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,360,SUCCESS
41,2018-10-18 12:40:15,164.020,E20E,0000,3130,0000,0000,1780,2400,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,358,SUCCESS
42,2018-10-18 12:40:19,168.021,E20E,0000,3130,0000,0000,1780,2400,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,356,SUCCESS
43,2018-10-18 12:40:23,172.021,E20E,0000,3130,0000,0000,1780,2400,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,357,SUCCESS
44,2018-10-18 12:40:27,176.022,E20E,0000,3130,0000,0000,1780,2400,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,355,SUCCESS
45,2018-10-18 12:40:31,180.023,E20E,0000,3130,0000,0000,1780,2400,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,355,SUCCESS
46,2018-10-18 12:40:35,184.023,E20E,0000,3130,0000,0000,1780,2400,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,354,SUCCESS
47,2018-10-18 12:40:39,188.024,E20E,0000,3130,0000,0000,1780,2400,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,353,SUCCESS
48,2018-10-18 12:40:43,192.025,E20E,0000,3130,0000,0000,1780,2400,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,352,SUCCESS
49,2018-10-18 12:40:47,196.025,E20E,0000,3130,0000,0000,1780,2400,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,352,SUCCESS
50,2018-10-18 12:40:51,200.026,E20E,0000,3130,0000,0000,1780,2400,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,352,SUCCESS
51,2018-10-18 12:40:55,204.026,E20E,0000,3130,0000,0000,1780,2400,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,352,SUCCESS
52,2018-10-18 12:40:59,208.026,E20E,0000,3130,0000,0000,1780,2400,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,352,SUCCESS
53,2018-10-18 12:41:03,212.027,E20E,0000,3130,0000,0000,1780,2400,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,351,SUCCESS
54,2018-10-18 12:41:07,216.028,E20E,0000,3130,0000,0000,1780,2400,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,350,SUCCESS
55,2018-10-18 12:41:11,220.029,E20E,0000,1060,0000,0000,1780,0E00,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,348,SUCCESS
56,2018-10-18 12:41:15,224.029,E20E,0000,1060,0000,0000,1780,0E00,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,363,SUCCESS
57,2018-10-18 12:41:19,228.030,E20E,0000,1060,0000,0000,1780,0E00,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,363,SUCCESS
58,2018-10-18 12:41:23,232.030,E20E,0000,1060,0000,0000,1780,0E00,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,362,SUCCESS
59,2018-10-18 12:41:27,236.031,E20E,0000,1060,0000,0000,1780,0E00,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,362,SUCCESS
60,2018-10-18 12:41:31,240.032,E20E,0000,1060,0000,0000,1780,0E00,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,360,SUCCESS
61,2018-10-18 12:41:35,244.032,E20E,0000,1060,0000,0000,1780,0E00,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,362,SUCCESS
62,2018-10-18 12:41:39,248.032,E20E,0000,1060,0000,0000,1780,0E00,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,360,SUCCESS
63,2018-10-18 12:41:43,252.033,E20E,0000,1060,0000,0000,1780,0E00,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,361,SUCCESS
64,2018-10-18 12:41:47,256.033,E20E,0000,1060,0000,0000,1780,0E00,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,360,SUCCESS
65,2018-10-18 12:41:51,260.034,E20E,0000,1060,0000,0000,1780,0E00,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,359,SUCCESS
66,2018-10-18 12:41:55,264.034,E20E,0000,1060,0000,0000,1780,0E00,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,359,SUCCESS
67,2018-10-18 12:41:59,268.035,E20E,0000,1060,0000,0000,1780,0E00,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,359,SUCCESS
68,2018-10-18 12:42:03,272.036,E20E,0000,1060,0000,0000,1780,0E00,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,358,SUCCESS
69,2018-10-18 12:42:07,276.036,E20E,0000,1060,0000,0000,1780,0E00,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,357,SUCCESS
70,2018-10-18 12:42:11,280.036,E20E,0000,1060,0000,0000,1780,0E00,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,356,SUCCESS
71,2018-10-18 12:42:15,284.037,E20E,0000,1060,0000,0000,1780,0E00,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,355,SUCCESS
72,2018-10-18 12:42:19,288.038,E20E,0000,1060,0000,0000,1780,0E00,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,356,SUCCESS
73,2018-10-18 12:42:23,292.038,E20E,0000,1060,0000,0000,1780,0E00,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,356,SUCCESS
74,2018-10-18 12:42:27,296.038,E20E,0000,1060,0000,0000,1780,0E00,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,356,SUCCESS
75,2018-10-18 12:42:31,300.039,E20E,0000,1060,0000,0000,1780,0E00,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,354,SUCCESS
76,2018-10-18 12:42:35,304.039,E20E,0000,1060,0000,0000,1780,0E00,4100,A010,0000,4100,7200,0000,0000,0000,0040,007C,0210,02B7,0000,4A54,8120,2000,354,SUCCESS

  • 0 in reply to Anatoly Dobreen
    TI__Genius 13605 points

    Hi,

    For BQ25708 GUI, I will ask design team to support.

    From your register content, I saw there is SYSOVP event in Charge Status Register 0x20[4]. And sysovp will turn off charge.

    So could you check your system voltage status?

    Thanks

  • 0 in reply to Paul Yeh
    Prodigy 110 points

    Hi Paul.

    Thanks a lot for help.

    We got a much more complex device than expected initially. Now making experiments with registers settings


    Couple additinal questions :
    - is command "write register" write only one register? sometimes after writing one register, settings for others are changing

    - Chaeger chip became very hot (70-80 deg, it maybe more). Is this correct? As I understand it used only for control power components. Do we need additional heat sink?

    Just in case added sshot for charger PCB area

    PCB in 2 layers. (Real device very big - so we used 2 layers, instead 4. save cost option) 

    R107 was missed in PCB - it soldered manually

    Thanks,
    Anatoly

  • 0 in reply to Anatoly Dobreen
    TI__Genius 13605 points

    Anatoly,

    1. For Write command, it will write all registers once you press the button.

    2. In general, IC should not be thermal source, could you double check MOSFETs and Inductor temperature, may be heat is from these components. Maybe you should need heat sink for these power components.

    3. For this 10ohm resistor, I think manually soldering should be fine. This part is not big current dissipation part.

    4. 2-layer board should be challenge in thermal design.

    Thanks 

     

     

     

  • 0 in reply to Paul Yeh
    Prodigy 110 points

    Hi Paul.

    Sorry for long delay with reply. I working at another projects in another place. (plenty works)

    I think that I found problem (Unfortunately I can not check at real device at the moment)

    It maybe I have problem with 24V supply. Since my supply close to max supply voltage, so when device started it turn on another loads at 24V bus, charger detected overvoltage (transients when loads ON/OFF), and then

    "The charger has fixed ACOV voltage. When VBUS pin voltage is higher than ACOV, it is considered as adapter over voltage. CHRG_OK will be pulled low, and converter will be disabled." (from datasheet)

    Is this mean that charger totally off? So Vsys also off?

    So when I using battery and when charger restarted, Vsys take battery voltage through parasitic diode at battery mosfet and I have stable 5V from Vsys.

    But in case if I try to use device without battery, charger constantly restarted.
    so Vsys - also can not be stable, so my host device at 5V also constantly restarted.

    How do you think can this have sense?

    I want to try decrease supply voltage to 23V and check how it will work without battery. Will check this at real device as soon as I can.

    Thank a lot for help.

    Regards,
    Anatoly

  • 0 in reply to Anatoly Dobreen
    TI__Genius 13605 points

    Anatoly,

    For ACOV condition, BQ25708 will turn off converter then turn on BATFET to discharge.

    And if ACOVP situation is disappeared, BQ25708 will re-start.

    Thanks

  • 0 in reply to Paul Yeh
    Prodigy 110 points

    Thanks for reply. Will check at real device as soon as I can. (then I hope, close topic)

    Additional question from our software developer. "Do TI have any example code for demonstration product with this charger chip?"


    Thanks again.

    Regards, Anatoly

  • 0 in reply to Anatoly Dobreen
    TI__Mastermind 25800 points

    Hey Anatoly,

    We do not have any TI support example code for this device, but I can point you to a third-party site with drivers for this device. Just know this reference code is not supported by TI.

    chromium.googlesource.com/chromiumos/platform/ec/+/master/driver/charger

    Regards,

    Joel H

  • 0 in reply to Anatoly Dobreen
    Prodigy 110 points

    Hi all.

    Sorry for huge delay with reply. Only now we continue work with those boards.

    Problems with work without battery solved with decreasing input voltage from 24V to 22.5V.


    Now we continue work with boards. There are some additional questions, for our design. To not make this topic cumbersome I will make anther topic.

    Thanks all for help. Have a great holidays!


    Regards,
    Anatoly