BQ27410-G1: State of Charge (SOH) and Remaining Capacity stuck at 0 after a Factory Reset

Hello Johann,

Does this happen all the gauges? When the batteries are swopped you perform the cycles to update the Qmax and Ra again? For a factory reset are you re-uploading your golden image?

Sincerely,

Wyatt Keller

Hi Wyatt, 

yes it happens with all the gauges so its repeatable.  If by "golden image" you mean previously captured calibration data, we don't do that.  We simply set parameters like Design Capacity and then run 2 charge-discharge cycles so the gauge can learn the properties of the battery.

regards

Hi Wyatt, the only thing that changed from "working fine" to "SoC remains 0% during both charge-discharge cycles" is I call the below function at fuelgauge initialisation.  However, if I call the below function and then power off the product and power it back on then it does the learning cycles with SoC valid.  Even if I call my fuelgauge_init() function after FACTORY_RESTORE it doesn't fix the problem.  So something else is needed after sending a factory_restore command and I don't know what that is.  Could it be a long delay?

#define SUB_FACTORY_RESTORE 0x0015 //Forces a Factory Restore of learned resistance and Qmax to defaults.

void fuelgauge_factory_reset(const HANDLE i2c_handle)
{
// Set-up transmission buffer.
tx_buffer[0] = (uint8_t) CMD_CONTROL;
// Control status sub-command low byte.
tx_buffer[1] = (uint8_t) SUB_FACTORY_RESTORE;
// Control status sub-command high byte.
tx_buffer[2] = (uint8_t) (SUB_FACTORY_RESTORE >> 8);

// Send data to fuel gauge.
fuelgauge_write(i2c_handle, 3);
}

regards

Thank you Wyatt. 

I had a look at the datasheet again and don't see that it is mentioned in the description of "factory reset" to follow it up with a power cycle.  Is it mentioned somewhere else.  I don't see a command as such to do a full power-on-reset (power cycle), only the various power modes - is there such a command or does the factory reset require a physical power cycle?

regards