Other Parts Discussed in Thread: BQSTUDIO
hello
I use BQ76952 as BMS and have 4 NTCs for cell temp and 2 NTCs for mosfet
here are the configs of these 6 pins
Error_flag=BQ769x2_SetRegister(TS1Config, 0x07, 1);
if(Error_flag)
return Error_flag;
Error_flag=BQ769x2_SetRegister(TS2Config, 0, 1);
if(Error_flag)
return Error_flag;
// Set TS3 to measure Cell Temperature -0x92FF = 0x07
Error_flag=BQ769x2_SetRegister(TS3Config, 0x07, 1);
if(Error_flag)
return Error_flag;
// Set HDQ to measure Cell Temperature - 0x9300 = 0x07
Error_flag=BQ769x2_SetRegister(HDQPinConfig, 0x07, 1);
if(Error_flag)
return Error_flag;
// Set CFETOFF to measure Cell Temperature - 0x92FA = 0x07
Error_flag=BQ769x2_SetRegister(CFETOFFPinConfig, 0x07, 1);
if(Error_flag)
return Error_flag;
// Set DDSG to measure MOSFET Temperature - 0x9302 = 0x0F
Error_flag=BQ769x2_SetRegister(DDSGPinConfig, 0x0F, 1);
if(Error_flag)
return Error_flag;
// Set DDSG to measure MOSFET Temperature - 0x9301 = 0x0F
Error_flag=BQ769x2_SetRegister(DCHGPinConfig, 0x0F, 1);
if(Error_flag)
return Error_flag;
and here is Enable Protection B and Alarm mask
Error_flag=BQ769x2_SetRegister(EnabledProtectionsB, 0xF7, 1);
if(Error_flag)
return Error_flag;
Error_flag=BQ769x2_SetRegister(DefaultAlarmMask, 0xF882, 2);
if(Error_flag)
return Error_flag;
and here is OTC and OTD config and for mosfet default values are ok
Error_flag=BQ769x2_SetRegister(OTCThreshold, 45, 1);//charge over temp 10-45 according datasheet
if(Error_flag)
return Error_flag;
Error_flag=BQ769x2_SetRegister(OTCDelay, 2, 1);
if(Error_flag)
return Error_flag;
Error_flag=BQ769x2_SetRegister(OTCRecovery, 40, 1);
if(Error_flag)
return Error_flag;
Error_flag=BQ769x2_SetRegister(OTDThreshold, 55, 1);//discharge over temp -20-55 according datasheet
if(Error_flag)
return Error_flag;
Error_flag=BQ769x2_SetRegister(OTDDelay, 2, 1);
if(Error_flag)
return Error_flag;
Error_flag=BQ769x2_SetRegister(OTDRecovery, 50, 1);
if(Error_flag)
return Error_flag;
the problem is none of the temperature protections for Cells or Mosfets will trigger or make mosfet off
here is the all of the init function
Error_flag=CommandSubcommands(SET_CFGUPDATE);
if(Error_flag)
return Error_flag;
//////////////////////////////Power and Reg configs //////////////////////////////
// 'Power Config' - 0x9234 = 0x2D80
// Setting the DSLP_LDO bit allows the LDOs to remain active when the device goes into Deep Sleep mode
// Set wake speed bits to 00 for best performance
Error_flag=BQ769x2_SetRegister(PowerConfig, 0x2D80, 2);
if(Error_flag)
return Error_flag;
// 'REG0 Config' - set REG0_EN bit to enable pre-regulator
Error_flag=BQ769x2_SetRegister(REG0Config, 0x01, 1);
if(Error_flag)
return Error_flag;
//BQ769x2_SetRegister(REG0Config, 0x00, 1);
// 'REG12 Config' - Enable REG1 with 5V output (0x0D for 3.3V, 0x0F for 5V)
Error_flag=BQ769x2_SetRegister(REG12Config, 0x0F, 1);
if(Error_flag)
return Error_flag;
//BQ769x2_SetRegister(REG12Config, 0x00 , 1);
////////Watch DOG
//turn on and off reg for 7 second
Error_flag=BQ769x2_SetRegister(HWDRegulatorOptions, 0x27, 1);
if(Error_flag)
return Error_flag;
//10s with now communications will triger Watchdog
Error_flag=BQ769x2_SetRegister(HWDDelay, 10, 2);
if(Error_flag)
return Error_flag;
//////////////////////////////pin configs //////////////////////////////
// Set DFETOFF pin to control BOTH CHG and DSG FET - 0x92FB = 0x42 (set to 0x00 to disable)
Error_flag=BQ769x2_SetRegister(DFETOFFPinConfig, 0x42, 1);
if(Error_flag)
return Error_flag;
// Set up ALERT Pin - 0x92FC = 0x2A
// This configures the ALERT pin to drive high (REG1 voltage) when enabled.
// The ALERT pin can be used as an interrupt to the MCU when a protection has triggered or new measurements are available
Error_flag=BQ769x2_SetRegister(ALERTPinConfig, 0x2A, 1);
if(Error_flag)
return Error_flag;
// Set TS1 to measure Cell Temperature - 0x92FD = 0x07
Error_flag=BQ769x2_SetRegister(TS1Config, 0x07, 1);
if(Error_flag)
return Error_flag;
Error_flag=BQ769x2_SetRegister(TS2Config, 0, 1);
if(Error_flag)
return Error_flag;
// Set TS3 to measure Cell Temperature -0x92FF = 0x07
Error_flag=BQ769x2_SetRegister(TS3Config, 0x07, 1);
if(Error_flag)
return Error_flag;
// Set HDQ to measure Cell Temperature - 0x9300 = 0x07
Error_flag=BQ769x2_SetRegister(HDQPinConfig, 0x07, 1);
if(Error_flag)
return Error_flag;
// Set CFETOFF to measure Cell Temperature - 0x92FA = 0x07
Error_flag=BQ769x2_SetRegister(CFETOFFPinConfig, 0x07, 1);
if(Error_flag)
return Error_flag;
// Set DDSG to measure MOSFET Temperature - 0x9302 = 0x0F
Error_flag=BQ769x2_SetRegister(DDSGPinConfig, 0x0F, 1);
if(Error_flag)
return Error_flag;
// Set DDSG to measure MOSFET Temperature - 0x9301 = 0x0F
Error_flag=BQ769x2_SetRegister(DCHGPinConfig, 0x0F, 1);
if(Error_flag)
return Error_flag;
//////////////////////////////cell und protection configs //////////////////////////////
// 'VCell Mode' - Enable 16 cells - 0x9304 = 0x0000; Writing 0x0000 sets the default of 16 cells
Error_flag=BQ769x2_SetRegister(VCellMode, 0x0000, 2);
if(Error_flag)
return Error_flag;
// Enable protections in 'Enabled Protections A' 0x9261 = 0xBC
// Enables SCD (short-circuit), OCD2 (over-current in discharge), OCD1 (over-current in discharge), OCC (over-current in charge),
// COV (over-voltage), CUV (under-voltage)
Error_flag=BQ769x2_SetRegister(EnabledProtectionsA, 0xFC, 1);
if(Error_flag)
return Error_flag;
// Enable all protections in 'Enabled Protections B' 0x9262 = 0xF7
// Enables OTF (over-temperature FET), OTINT (internal over-temperature), OTD (over-temperature in discharge),
// OTC (over-temperature in charge), UTINT (internal under-temperature), UTD (under-temperature in discharge), UTC (under-temperature in charge)
Error_flag=BQ769x2_SetRegister(EnabledProtectionsB, 0xF7, 1);
if(Error_flag)
return Error_flag;
// Enable Precharge Timeout (PTO)
Error_flag=BQ769x2_SetRegister(EnabledProtectionsC, 0x04, 1);
if(Error_flag)
return Error_flag;
// 'Default Alarm Mask' - 0x..82 Enables the FullScan and ADScan bits, default value = 0xF800
Error_flag=BQ769x2_SetRegister(DefaultAlarmMask, 0xF882, 2);
if(Error_flag)
return Error_flag;
//////////////////////////////cell balancing configs //////////////////////////////
// Set up Cell Balancing Configuration - 0x9335 = 0x03 - Automated balancing while in Relax or Charge modes
// Also see "Cell Balancing with BQ769x2 Battery Monitors" document on ti.com
Error_flag=BQ769x2_SetRegister(BalancingConfiguration, 0x03, 1);
if(Error_flag)
return Error_flag;
//Relax mode
Error_flag=BQ769x2_SetRegister(CellBalanceMinCellVRelax, BALANCE_MINVOLTAGE_RELAX, 2);
if(Error_flag)
return Error_flag;
Error_flag=BQ769x2_SetRegister(CellBalanceMinDeltaRelax, BALANCE_DELTASTART_RELAX, 1);
if(Error_flag)
return Error_flag;
Error_flag=BQ769x2_SetRegister(CellBalanceStopDeltaRelax, BALANCE_DELTASTOP_RELAX, 1);
if(Error_flag)
return Error_flag;
//Charge mode
Error_flag=BQ769x2_SetRegister(CellBalanceMinCellVCharge, BALANCE_MINVOLTAGE_CHARGE, 2);
if(Error_flag)
return Error_flag;
Error_flag=BQ769x2_SetRegister(CellBalanceMinCellVCharge, BALANCE_DELTASTART_CHARGE, 1);
if(Error_flag)
return Error_flag;
Error_flag= BQ769x2_SetRegister(CellBalanceMinCellVCharge, BALANCE_DELTASTOP_CHARGE, 1);
if(Error_flag)
return Error_flag;
//Number of cell that we want to balancing in same time
Error_flag=BQ769x2_SetRegister(CellBalanceMaxCells, BALANCE_MAX_CELL, 1);
if(Error_flag)
return Error_flag;
Error_flag=BQ769x2_SetRegister(CellBalanceInterval,5, 1);
if(Error_flag)
return Error_flag;
//////////////////////////////precharge configs //////////////////////////////
// start pre charge from 500mv pro cell until PRECHARGE_STOP_VOLTAGE pro cell
Error_flag=BQ769x2_SetRegister(PrechargeStartVoltage, PRECHARGE_START_VOLTAGE, 2);
if(Error_flag)
return Error_flag;
Error_flag=BQ769x2_SetRegister(PrechargeStopVoltage, PRECHARGE_STOP_VOLTAGE, 2);
if(Error_flag)
return Error_flag;
Error_flag=BQ769x2_SetRegister(PTODelay, 18000, 2); //5 uhr precharge timeout (s)
if(Error_flag)
return Error_flag;
//////////////////////////////predischarge configs //////////////////////////////
//Enable predischarge seq
Error_flag=BQ769x2_SetRegister(FETOptions, 0x1D,1);
if(Error_flag)
return Error_flag;
//set pre discharge timeout to 2.50 sec = 250 * 10 ms
Error_flag=BQ769x2_SetRegister(PredischargeTimeout, 250,1);
if(Error_flag)
return Error_flag;
//////////////////////////////shutdown protect configs //////////////////////////////
if(fail_status.OTP_FAIL==0)
{
Error_flag=BQ769x2_SetRegister(ShutdownStackVoltage, (PACK_SHUTDOWN_VOLTAGE/10), 2);
if(Error_flag)
return Error_flag;
Error_flag=BQ769x2_SetRegister(LowVShutdownDelay, 10, 1);
if(Error_flag)
return Error_flag;
}
//////////////////////////////temp protection configs //////////////////////////////
Error_flag=BQ769x2_SetRegister(OTCThreshold, 45, 1);//charge over temp 10-45 according datasheet
if(Error_flag)
return Error_flag;
Error_flag=BQ769x2_SetRegister(OTCDelay, 2, 1);
if(Error_flag)
return Error_flag;
Error_flag=BQ769x2_SetRegister(OTCRecovery, 40, 1);
if(Error_flag)
return Error_flag;
Error_flag=BQ769x2_SetRegister(OTDThreshold, 55, 1);//discharge over temp -20-55 according datasheet
if(Error_flag)
return Error_flag;
Error_flag=BQ769x2_SetRegister(OTDDelay, 2, 1);
if(Error_flag)
return Error_flag;
Error_flag=BQ769x2_SetRegister(OTDRecovery, 50, 1);
if(Error_flag)
return Error_flag;
//mosfet over temp is defult 80 and bms internal temp is 85
//////////////////////////////voltage and currnet protection configs //////////////////////////////
// Set up CUV (under-voltage) Threshold - 0x9275 = 0x31 (2479 mV)
// CUV Threshold is this value multiplied by 50.6mV
Error_flag=BQ769x2_SetRegister(CUVThreshold, CELL_MIN_VOLTAGE, 1);
if(Error_flag)
return Error_flag;
Error_flag=BQ769x2_SetRegister(CUVRecoveryHysteresis, 2 , 1); //that mean 2*50.6 mv more =101.2mv
if(Error_flag)
return Error_flag;
Error_flag=BQ769x2_SetRegister(BodyDiodeThreshold, 400 , 2); //set threshold to turn on dsg or cs mosfet after cuv or cov 400ma
if(Error_flag)
return Error_flag;
// Set up COV (over-voltage) Threshold - 0x9278 = 0x48 3643 mV)
// COV Threshold is this value multiplied by 50.6mV
Error_flag=BQ769x2_SetRegister(COVThreshold, CELL_MAX_VOLTAGE, 1);
if(Error_flag)
return Error_flag;
// Set up OCC (over-current in charge) Threshold - 0x9280 = 0x05 (14 mV = 14A across 1mOhm sense resistor) Units in 2mV
Error_flag=BQ769x2_SetRegister(OCCThreshold, (PACK_MAX_CHARGE_CURRENT/2), 1);
if(Error_flag)
return Error_flag;
Error_flag=BQ769x2_SetRegister(OCCRecoveryThreshold, 300, 2);
if(Error_flag)
return Error_flag;
// Set up OCD1 Threshold - 0x9282 = 0x0A (20 mV = 20A across 1mOhm sense resistor) units of 2mV
Error_flag=BQ769x2_SetRegister(OCD1Threshold, (PACK_MAX_DISCHARGE_CURRENT/2), 1);
if(Error_flag)
return Error_flag;
// Set up OCD1 delay 100 *3.3ms = 3.3s
Error_flag=BQ769x2_SetRegister(OCD1Delay,120, 1);
if(Error_flag)
return Error_flag;
// Set up OCD2 Threshold - 0x9282 = 0x0A (20 mV = 20A across 1mOhm sense resistor) units of 2mV
Error_flag=BQ769x2_SetRegister(OCD2Threshold, ((PACK_MAX_DISCHARGE_CURRENT+80)/2), 1);
if(Error_flag)
return Error_flag;
Error_flag=BQ769x2_SetRegister(OCD2Delay,20, 1);
if(Error_flag)
return Error_flag;
//set threshold to turn off ocd alert , ma
Error_flag=BQ769x2_SetRegister(OCDRecoveryThreshold, 10, 2);
if(Error_flag)
return Error_flag;
//set threshold to turn off ocdl alert , ma
Error_flag=BQ769x2_SetRegister(OCDLRecoveryThreshold, 10, 2);
if(Error_flag)
return Error_flag;
// Set up SCD Threshold - 0x9286 = 11 (300 mV = 200A across 1mOhm sense resistor) 0x05=100mV
Error_flag=BQ769x2_SetRegister(SCDThreshold, 11 , 1);
if(Error_flag)
return Error_flag;
// Set up SCD Delay - 0x9287 = 0x0B (150 us) Enabled with a delay of (value - 1) * 15 µs; min value of 1
Error_flag=BQ769x2_SetRegister(SCDDelay, 0x0B, 1);
if(Error_flag)
return Error_flag;
// Set up SCDL Latch Limit to 1 to set SCD recovery only with load removal 0x9295 = 0x01
// If this is not set, then SCD will recover based on time (SCD Recovery Time parameter).
Error_flag=BQ769x2_SetRegister(SCDLLatchLimit, 0x01, 1);
if(Error_flag)
return Error_flag;
// Exit CONFIGUPDATE mode - Subcommand 0x0092
Error_flag=Subcommands(MANU_DATA, 0xaaaa, W32);
if(Error_flag)
return Error_flag;
Error_flag=BQ769x2_SetRegister(MfgStatusInit, 0x0080, 2);
if(Error_flag)
return Error_flag;
// #define CoulombCounterOffsetSamples 0x91C6 //Calibration:Current Offset:Coulomb Counter Offset Samples
//#define BoardOffset 0x91C8
Error_flag=CommandSubcommands(EXIT_CFGUPDATE);
if(Error_flag)
return Error_flag;
return OK;
thanks
Alireza
