BQ25155: BQ25155EVM　Charging operation

Hi 

Can you please share other register values?

Also, can you please share the status of your /CE, /LP, and MR pins?

Best Regards,

Juan Ospina

Attach Save data.
Initial value and changed value.

* Created: Fri Feb 16 07:46:22 JST 2024
*
* Format: Register Name  tab Character,\t  Register Address  tab Character,\t  Hexadecimal register value.
* Device: bq25155
* BQZ Container: Charger_1_00-bq25155.bqz
*
STAT0	01
STAT1	00
STAT2	00
FLAG0	01
FLAG1	00
FLAG2	00
FLAG3	00
MASK0	00
MASK1	00
MASK2	71
MASK3	00
VBAT_CTRL	3C
ICHG_CTRL	28
PCHRGCTRL	84
TERMCTRL	14
BUVLO	00
CHARGERCTRL0	82
CHARGERCTRL1	C2
ILIMCTRL	06
LDOCTRL	E0
MRCTRL	2A
ICCTRL0	10
ICCTRL1	00
ICCTRL2	40
ADCCTRL0	02
ADCCTRL1	40
ADCDATA_VBAT_M	9DDE
ADCDATA_TS_M	556C
ADCDATA_ICHG_M	0030
ADCDATA_ADCIN_M	6ACC
ADCDATA_VIN_M	D52C
ADCDATA_PMID_M	C206
ADCDATA_IIN_M	040A
ADCALARM_COMP1_M	2320
ADCALARM_COMP2_M	3890
ADCALARM_COMP3_M	0000
ADC_READ_EN	00
TS_FASTCHGCTRL	34
TS_COLD	7C
TS_COOL	6D
TS_WARM	38
TS_HOT	27
DEVICE_ID	35

* Created: Fri Feb 16 07:41:45 JST 2024
*
* Format: Register Name  tab Character,\t  Register Address  tab Character,\t  Hexadecimal register value.
* Device: bq25155
* BQZ Container: Charger_1_00-bq25155.bqz
*
STAT0	01
STAT1	00
STAT2	00
FLAG0	01
FLAG1	00
FLAG2	00
FLAG3	00
MASK0	00
MASK1	00
MASK2	71
MASK3	00
VBAT_CTRL	3C
ICHG_CTRL	08
PCHRGCTRL	02
TERMCTRL	14
BUVLO	00
CHARGERCTRL0	82
CHARGERCTRL1	C2
ILIMCTRL	06
LDOCTRL	B0
MRCTRL	2A
ICCTRL0	10
ICCTRL1	00
ICCTRL2	40
ADCCTRL0	02
ADCCTRL1	40
ADCDATA_VBAT_M	9DDE
ADCDATA_TS_M	556C
ADCDATA_ICHG_M	0030
ADCDATA_ADCIN_M	6ACC
ADCDATA_VIN_M	D52C
ADCDATA_PMID_M	C206
ADCDATA_IIN_M	040A
ADCALARM_COMP1_M	2320
ADCALARM_COMP2_M	3890
ADCALARM_COMP3_M	0000
ADC_READ_EN	00
TS_FASTCHGCTRL	34
TS_COLD	7C
TS_COOL	6D
TS_WARM	38
TS_HOT	27
DEVICE_ID	35

LP=VIO. MR=Open.
I set the CE pin to Open (L).
Charging will start, but if you leave it for a few minutes, the current will drop to around 10mA again.
Why isn't it retained?

For example, even if you change LDOCTRL to 3.0V and press "ReadRegister" to read it, it will remain at 3.0V.
ICHG_CTRL will change to 10mA.

I wonder why?

Is it working with some kind of timer, or is the timer setting incorrect?

In addition, if you disconnect VIN while BATT is connected,
Even if I perform "ReadRegister" to read the ADC, the ADC value is not updated.
ADCDATA_VBAT_M　0x42～0x4E
What is the cause of this?

Disable watchdog register.
The charging issue has been resolved. Thank you.

Regarding the ADC, I was able to read it, but the problem remained.

If you check ADC Conv Start and click ReadRegister, it will be updated, but the check for ADC Conv Start will be cleared and you will need to check it again.
Also, even if the ADC Read Rate is set to every second, it will not be updated and a ReadRegister will be required.

Is this behavior correct?
Is there something wrong with using it?

I don't really understand how to use ADC Read Rate. Please explain.

Just to confirm, is there no ADC that monitors BATT's discharge current or PMID's output current?
Please let me know if there is anything that can be substituted.

Please also tell me about SaveRegister and LoadRegister.
The register is saved and then read, but it seems to be reflected in the register on the screen, but it does not seem to be written to the actual EV board.
Even if I set UpdateMode to Mnual and write, it doesn't seem to be reflected.
Why?

Hi,

The ADC Conv Start bit is meant to be self clearing once the ADC read begins, though for the 1s mode it should be reading again once per second. Can you try setting it to continuous mode to see if it updates on its own?

ADC Read Rate should set the rate at which the channels are sampled (continously, once per second, once per minute, or manually). Please refer to the ADC section of the datasheet for more information.

Read Register executes I2C reads of the device register memories so it will reflect the existing register values on the device.

Write register allows for manually writing of the I2C commands. Typically this won't have an effect if you are in "immediate" write mode since it will write the I2C as soon as the value is changed. If you have manual write mode then write register is when the register values will be written.

yuuzi kuriiwa said:

Even if I set UpdateMode to Mnual and write, it doesn't seem to be reflected.

Is this true for all register values (where none of them are updated) or only some register values? Some register values require certain conditions to be writable.

yuuzi kuriiwa said:

Just to confirm, is there no ADC that monitors BATT's discharge current or PMID's output current?

No, there isn't an ADC channel that measures discharge current for this device, only charge current.

Best Regards,

Juan Ospina

The setting value is recorded to the File using SaveRegister.
If you load this ↑ File with LoadRegister,
I believe that the data will be reflected on the EVM board.
However, register is not reflected. (All Registers)
Is my understanding wrong?

Hi Yuuzi,

In that case you will have to set the software to manual write and press the write register button to write all the register values to the EVM.

Best Regards,

Juan Ospina

I've already tried it, and I also tried it manually, but the result is the same.

Can you please share a screen shot after LoadRegister but before manual write, then after manual write, then after a read? The writable registers should be changed in value, the non-writable fields may not change.

Writable Registers are also not reflected.