BQ76952EVM: OTP programming error.

Andras Tamas Magyar

Part Number: BQ76952EVM

Hi,

I got the BQ76952EVM which I hooked up to a 16S battery pack, then i have this screen:

I have a few question:

1.Is the startup OTP looks right?

2. Why do I have those certain alam enable bits enabled?

3. In the lowest windows I have checked if I can write the OTP or not, but it says the the BAT voltage is too high, why is is to?

My battery voltage is around 5240 * 10mV which can be seen in the GUI and also as I measured the on the VC16 bit..

Also when I send on SET_CFGUPDATE command the OTPB bit should dissapear but it does not:

Also important thing is that when I set the bit OTPW_EN in the Mfg Status Init the OTPB dissapears but also CFGUPDATE bit.

Thanks for the answer,

Andras

+1 Luis H. S. over 3 years ago

Hello Andras,

In order to OTP program, you have to have a BAT voltage of 10-V to 12-V. This is mentioned in Section 7.3 of the datasheet.

You should read Section 3 OTP Programming of the BQ769x2 Calibration and OTP Programming Guide in order to better understand how to OTP program.

If you have any questions after reading this guide, let us know.

Best Regards,

Luis Hernandez Salomon

0 Andras Tamas Magyar over 3 years ago in reply to Luis H. S.

Hi,

Ok, thanks!

Other things: Why the alarm enable signals are on such as SSBC,SSA, PF, MSK_SFALERT, MSK_PFALERT?

Why the fets are off by the default?

I do not see any protection triggered in the safety status and alarm registers, it is strange.

Thanks,

Andras

0 Andras Tamas Magyar over 3 years ago in reply to Luis H. S.

Hy,

In the meantime I solved my problem: FET_EN has to be on in the Mfg Init Status.

Thanks anyway,

Andras

0 Luis H. S. over 3 years ago in reply to Andras Tamas Magyar

Hello Andras,

I am glad you were able to solve your problem.

Best Regards,

Luis Hernandez Salomon

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