BQ25730EVM: BQ25730EVM about

Hi Seung Woo,

Thanks for reaching out.

1. Power will be consumed in battery only condition to keep the IC operating. However, you should be able to achieve very low quiescent current (~22 uA). You will need to disconnect J8 to achieve that. That path is also used to power circuitries not related to the charger.

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1012238/bq25713-bq25713-low-power-mode 

2. What is your battery voltage and what are you using as a battery (actual battery, emulator, or others,)? For 2 cell setting, charge voltage defaults to 8.4 V. To achieve a minimum system voltage, you can access and change the VSYS_MIN() register. 

Can you also read ChargerStatus() to see if any protection/fault is active? Hopefully that will give us some insight to why your setup is not charging. In generally, it should be not too hard to get the EVM setup to work.

Thanks and I hope this helps,

Peng

*Please press "This Resolved My Issue" on the thread if my answer is satisfactory

HI

The input uses a 24V 2.5A adapter and the I2C settings are as follows.

But it doesn't charge. Can you tell me why?

    bq25730(chg_ok).txt
    
* Created: Mon Jul 26 16:01:58 KST 2021
*
* Format: Register Name  tab Character,\t  Hexadecimal register value.
* Device: bq2573x
* BQZ Container: Charger_1_00-bq2573x.bqz
*
Charge Option 0	020E
Charge Current	0200
Max Charge Voltage	20D0
OTG Voltage	09C4
OTG Current	3C00
Input Voltage	1CC0
Min System Voltage	5400
IIN_HOST	2000
Charger Status	8A00
Prochot Status	B9A0
IIN_DPM	2000
ADC VBUS and PSYS	6600
ADC IBAT	0000
ADC IIN and CMPIN	0000
ADC VSYS and VBAT	0000
Manufacture ID	D540
Device ID	00D5
Charge Option 1	3E00
Charge Option 2	00B7
Charge Option 3	0030
Prochot Option 0	4A00
Prochot Option 1	41A4
ADC Option	2000
Charge Option 4	0048
Vmin Active Protection	006C

Hi Seung Woo,

I took a look at the register list. It is mostly ok but I found a few spots weird.

Something doesn't add up with your picture and your I2C setting. Did you load the system output when you capture this I2C setting? I went through the register values and this is what I found:



So adapter was present but it was in IINDPM. When the device is in IINDPM, it prioritize the load over charging so that is why you won't see it charging. All the power goes to the output load on VSYS. 

I also noticed that your input cable is very thin, recommend to change to larger cables for power testing.

Can you try a benchtop power supply for the input and a DC load as the battery to assist with debug? Please follow the EVM instructions to get the charger operation going before moving to actual adapter + actual battery.

https://www.ti.com/lit/ug/sluucb9a/sluucb9a.pdf?ts=1627309072847&ref_url=https%253A%252F%252Fwww.google.com%252F 




Thanks and I hope this helps,

Peng

*Please press "This Resolved My Issue" on the thread if my answer is satisfactory

HI

thanks for the reply.

But Tested with nothing connected to VSYS.

Do I need to JUMPER ON JP4 and JP2 as shown in the EVM datasheet?

Hi Seung Woo,

Using the factory setting is fine for now:



Thanks and I hope this helps,

Peng

*Please press "This Resolved My Issue" on the thread if my answer is satisfactory

Dear Phengzhao,

Hello, This is Chase, handle this issue with Seung Woo.

As Seung Woo said, there was no load on VSYS(J6). is it possible under this condition?

additionally, the screenshot of charger status, it says the charger is in precharge status but the power supply does not appear any current consumption.

could you expect the reason of this symptom?

Best regards,

Chase

Hi Chase,

Have you guys followed the EVM instruction and still not able to do it? Please try that first with a benchtop power supply and DC load. Make sure the jumper setting corresponds to the setup used (for example, DC load voltage range aligns with battery cell setting). Make sure JP6 is not installed.

If you guys still not able to get it to work. Please:

1. Let me know your input voltage, dc load voltage
2. send the register setting again
3. Let me know your jumper setting.

Thanks and I hope this helps,

Peng

*Please press "This Resolved My Issue" on the thread if my answer is satisfactory

HI

If the adapter is connected while the i2c setting is set to the default value, it becomes IN IINDPM. Why is that??

1. input voltage 10V

3. JP2, JP3(3-4), JP8 JUMPER ON

    BQ25730default.txt
    
* Created: Thu Jul 29 14:15:32 KST 2021
*
* Format: Register Name  tab Character,\t  Hexadecimal register value.
* Device: bq2573x
* BQZ Container: Charger_1_00-bq2573x.bqz
*
Charge Option 0	E70E
Charge Current	0000
Max Charge Voltage	20D0
OTG Voltage	09C4
OTG Current	3C00
Input Voltage	1500
Min System Voltage	4200
IIN_HOST	2000
Charger Status	8800
Prochot Status	B820
IIN_DPM	2000
ADC VBUS and PSYS	6700
ADC IBAT	0000
ADC IIN and CMPIN	0000
ADC VSYS and VBAT	0000
Manufacture ID	D540
Device ID	00D5
Charge Option 1	3F00
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

Hi Seung Woo,

Based on my experience working with the EVM, I would say that it should not be this hard to get the EVM to work (would be different if it is a customized design). I suspect it is a damaged board. Is there a possibility that the board is damaged? Do you have another EVM you can try?

I will go into the lab tomorrow and put the EVM under the same condition as you right now and confirm for you, this is what I will test:

VIN = 10 V
Battery Emulator at VBAT = 7.8 V

Default JP setting on the EVM

Default I2C settings and only change the minimum to enable charging.

I will let you know tomorrow. I apologize for the inconvenience.

Thanks and I hope this helps,

Peng

*Please press "This Resolved My Issue" on the thread if my answer is satisfactory

thank you peng

Dear Pengzhao,

Thank you for your support.

we will get another EVM, and test it again as you mentioned.

i will reply to this thread about the result. Thanks.

Best regards,

Chase