STC3115: Does not start up

Hello,

We are using a STC3115 in one of our designs. The problem is that it does not start up.

I read: 

https://github.com/st-sw/STC3115GenericDriver/wiki/STC3115-FAQ

It looks like the problem is that the BATD is 'high'. I tried to force it low by connecting it to ground through a 1K resistor. However, the output of BATD is still 3.7V. Is there a way I can force it to become 'low'?

On the software side:

- I can communicate via I2C. The counter value reads: 1. So it seems that it starts, but then stops.

- A soft reset does not help

- I call BatterMonitorInit once 

BatteryReadStateOfCharge is called every 500 ms.

- This results in the following o

utput:

My question is, why does it not start? Is 

there something else i need to initialise?

Code 

void BatteryMonitorInit(TI2CWriteReadFunction I2CWriteReadFunction)

{

    I2CWriteRead = I2CWriteReadFunction;

    TxBuffer[0] = 1; //regctrl

    TxBuffer[1] = 0; //reset

    I2CWriteRead(TxBuffer, 2, RxBuffer, 0);

    // nrf_delay_ms(10);

    //write REG_CC_CNF

    TxBuffer[0] = REG_CC_CNF;

    TxBuffer[1] = 210; //466

    TxBuffer[2] = 1;

    I2CWriteRead(TxBuffer, 3, RxBuffer, 0);

    //write REG_VM_CNF

    TxBuffer[0] = REG_VM_CNF;

    TxBuffer[1] = 157; //157

    TxBuffer[2] = 0;

    I2CWriteRead(TxBuffer, 3, RxBuffer, 0);    

    TxBuffer[0] = REG_MODE;

    TxBuffer[1] = 1+16;

    I2CWriteRead(TxBuffer, 2, RxBuffer, 0);

}

uint8_t BatteryMonitorReadStateOfCharge(void)

{

    TxBuffer[0] = REG_SOC;

    I2CWriteRead(TxBuffer, 1, RxBuffer, 2);

    uint16_t StateOfCharge = (RxBuffer[1] << 8) + RxBuffer[0];

    dbg(''rx[1]:%d\n'',RxBuffer[1]);

    dbg(''rx[0]:%d\n'',RxBuffer[0]);

    uint8_t StateOfChargePercentage = StateOfCharge >> 9;

    TxBuffer[0] = 1; //regctrl

    I2CWriteRead(TxBuffer, 1, RxBuffer, 1);

    dbg(''REG_CTRL\n'')

    dbg(''rx[0]:%d\n'',RxBuffer[0]);

    TxBuffer[0] = 0; //regmode

    I2CWriteRead(TxBuffer, 1, RxBuffer, 1);

    dbg(''REG_MODE\n'')

    dbg(''rx[0]:%d\n'',RxBuffer[0]);

    TxBuffer[0] = 4;

    I2CWriteRead(TxBuffer, 1, RxBuffer, 2);

    dbg(''Counter\n'');

    dbg(''rx[0]:%d\n'',RxBuffer[0]);

    dbg(''rx[1]:%d\n'',RxBuffer[1]);

    TxBuffer[0] = 8; //reg voltage

    I2CWriteRead(TxBuffer, 1, RxBuffer, 2);

    dbg(''batt voltage\n'');

    dbg(''rx[1]:%d\n'',RxBuffer[1]);

    dbg(''rx[0]:%d\n'',RxBuffer[0]);

    TxBuffer[0] = 13; //reg open circuit voltage

    I2CWriteRead(TxBuffer, 1, RxBuffer, 2);

    dbg(''Open circuit voltage\n'');

    dbg(''rx[1]:%d\n'',RxBuffer[1]);

    dbg(''rx[0]:%d\n'',RxBuffer[0]);

    TxBuffer[0] = 22; //reg relax

    I2CWriteRead(TxBuffer, 1, RxBuffer, 1);

    dbg(''relax counter\n'');

    dbg(''rx[0]:%d\n'',RxBuffer[0]);

    return StateOfChargePercentage;

}

Resulting Output:

SOC

rx[1]:58

rx[0]:168

REG_CTRL

rx[0]:4

REG_MODE

rx[0]:17

Counter

rx[0]:1

rx[1]:0

batt voltage

rx[1]:6

rx[0]:173

Open circuit voltage

rx[1]:26

rx[0]:180

relax counter

rx[0]:120

result 29

SOC

rx[1]:58

rx[0]:160

REG_CTRL

rx[0]:4

REG_MODE

rx[0]:17

Counter

rx[0]:2

rx[1]:0

batt voltage

rx[1]:6

rx[0]:162

Open circuit voltage

rx[1]:26

rx[0]:179

relax counter

rx[0]:120