Original question:
Hi there,
It seemed to be obvious, however, it doesn't work.
I habe a BQ34110 connected successfully to the Battery Management Studio. I can see all registers. As I have a 4-series-cell NiMH configuration with 2300 mAh, I would like to change these settings. So going to the "Data Memory" and changing the "Number of Series Cells" to 4, then clicking "Write_All" does not take it. when reading all registers this number is set back to "1".
What do I do wrong?
Best regards
Nik
Hi Nick
Thx for responding so quickly. I tried to send UNSEAL command and also UNSEAL_FULL_ACCESS, but neither made it work.
According to the registers bit SEC1 = 0 and SEC0 = 1 it seems to be in full access mode.
I attached a screenshot of the registers and the memory:
I also try to set VEN_EN in the Pin Control Config. To do so I first set the PCTL_EN, which I could do successfully. However, when pressing on "Write to Data Memory" button simply nothing is sent to the BQ (I'm monitoring the I2C). Pressing "Write_All" and then read all back again simply resets VEN_EN again.
So what do I do wrong?
Eventually I want to read the voltage of the battery package. For this I have to set VEN so that my external voltage devider circuti gets active. And I have to set the number of cells.
Kind regards, Nik
Hi Nick,
I'm using my own circuit which looks like this (sorry for not providing this previously!!):
I have a 4s-setup (4x NiMH). Thus I added that voltage devider circuitry as described in the user guide (or data sheet, or ...).
So there are two things to do:
- Set the "Number of Series Cells" in Configuration (as shown above, which I am unable to change for unknown reason?)
- Set VEN_EN bit of the Pin Control Config byte in Settings. This is to enable the battery voltage to reach BAT pin of the fuel gauge. This is the reason why the voltage is still read as '0'. But neither I'm able to manipulate this pin.
Kind regards
Nik
Hi Nick,
Thank you for your response.
"You are going to create a new circuit or configuration that supports 1 battery in series".
Well, I can't change the specifications of the application which requires 4 batteries in series!? (Or did ther occur a missunderstanding?) Due to that the BQ34110 got selected as it supports multi-cell configuration like this. The required external voltage divider (controlled by VEN) is added.
Now I only need to be able to configure the BQ34110 according to this setup as it comes by default with "1s Li-Ion).
I already decribed to process in my previous post.
"If the gauge can not read a voltage, then you will not be able to change data flash parameters in data memory."
Well, I need to be able to control VEN first before the gauge is able to read anything else then zero volt.
So this may be the first issue to solve: Why doens't the gauge want to accept my command to enable VEN? I.e.
1. Enable Pin Control:
2. Enable "VEN_EN":
But when reading all regisers it return to '0' again.
Best regards
Nik
Hi Nick
Thank for your response. You didn't point me directly to the solution but you pushed me there! So thank you very much for your patience.
However, below the solution:
Sending "CAL_TOGGLE" command puts the device into calibration mode, in which disables write restrictions to the flash.
After this step, I was able to change the number of cells as well as enable VEN output pin. Now the voltage is displayed.
