BQ34Z100-G1: Full Access Command

Javier Gutierrez Jimenez

Part Number: BQ34Z100-G1

Hi,

I am trying to execute from my microcontroller a Full access comand to BQ34Z100-G1 but it does not works. My code is the following:

i2c_write(BQ,0xAA); // I2C Address
i2c_write(BQ,0x00); // Register
i2c_write(BQ,0xFF); // Byte 0 Default Key for Full access
i2c_write(BQ,0xFF); // Byte 1 Default Key for Full access
i2c_write(BQ,0xFF); // Byte 2 Default Key for Full access
i2c_write(BQ,0xFF); // Byte 3 Default Key for Full access

I have other commands in my code with a similar structure that work like It enable, etc.

Can anybody help me?

Thanks in advanced

over 4 years ago

0 Shirish over 4 years ago

TI__Guru 57697 points

For full access commands to work, the gauge must be in unsealed mode before sending Full access commands.

0 Javier Gutierrez Jimenez over 4 years ago in reply to Shirish

Intellectual 360 points

Hi Sirish,

Thanks for you answer.

When I send the full access command the Guage is in unsealed mode but not works. Is my I2C sequence correct?

Thanks in advanced.

0 Shirish over 4 years ago in reply to Javier Gutierrez Jimenez

TI__Guru 57697 points

Hi Javier,

I suggest that you try the same commands from Battery Management Studio Advanced Comm tab and compare.This will identify if there may be something wrong with your code or if the gauge is in a state where it cannot enter full access mode.

You may also want to check if the key was changed from default to a new value.

0 Javier Gutierrez Jimenez over 4 years ago in reply to Shirish

Intellectual 360 points

Hi Sirish.

Thanks for you answer.

I have tried the battery studio commands and all work correctly(Sealed, unsealed and full acces commmnand). I have also checked the FAST and SS bits of the Control register and their values are correct.

The keys for unseal and full access are the default keys:

- FFFFFF: Full acces
- 36720413: Unseal.

I think there is something wrong with my I2C sequence code, because for the same situation, the full command of battery studio Works but my Code I2C not doesn't. 

Best regards

0 Javier Gutierrez Jimenez over 4 years ago in reply to Javier Gutierrez Jimenez

Intellectual 360 points


Hi sirish,

I have gotten the unsealed full acces command to work from my MCU.

Now, my question is the following: When I write from my MCU using I2C a BQ flash parameter and change its value , is it necessary to execute any command like RESET or IT ENABLE afterwards ?

Best regards

0 Shirish over 4 years ago in reply to Javier Gutierrez Jimenez

TI__Guru 57697 points

Hello Javier,

It depends on what flash parameters are being written. Not everything requires a reset. You can send a single reset after writing all flash parameters.

Note that BQ34z100-G1 is designed to be used as a pack side gauge where flash parameters are set at time of manufacture.

0 Javier Gutierrez Jimenez over 4 years ago in reply to Shirish

Intellectual 360 points

Hello Sirish,

Thanks for you answer. I'll send the RESET COMMAND after writing all flash parameter.

Actually I send a IT ENABLE COMMAND after writing "current taper Window", "taper current", "FC Clear" and "cell charge voltage T1-T2 T2-T3,T3-T4", this command is necessary for this flahs paramters or just the RESET COMMAND is enough?

We configure the flash parameters at time of manufature, but we want to have the posivility to change parameters when our equipment is working.

Best regards

0 Shirish over 4 years ago in reply to Javier Gutierrez Jimenez

TI__Guru 57697 points

IT enable is separate from Reset. IT Enable should be sent after parameters are set during manufacture. It should stay enabled after that and there is no need to send it again

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BQ34Z100-G1: Full Access Command