BQ76PL455A-Q1: The voltage of cell#12 is always higher than the actual value

Hi Taylor,

We were connect actual cells.

Best Regards,

Aaron

Hi Roger,

No. The issue persist.

Our schematics as attachment.B0013_Slave_v002_Sechemastics_01-04.pdf

Hi Roger,

We mount R57 for 390pF out cap show as following:

Best Regards,

Aaron

Hi Roger,

My code as following:

main(){

.....

PL455_Reboot();

PL455_ClearFault();

PL455_AutoAddress();

PL455_EnableCommunication();

PL455_SetBaudrate();

PL455_SetCommunication();

PL455_ClearFault2();

PL455_SetAFE();

PL455_SetOVUV();

PL455_BrocastRequest(bFrame); // Measure Cell Voltage

......

}

void PL455_SetAFE(void)
{
	for(nDev_ID=0;nDev_ID < TOTALBOARDS;nDev_ID++)
	{
		// Configure AFE (section 2.2.1)
		nSent = WriteReg(nDev_ID, 60, 0x00, 0x00, 1, FRMWRT_SGL_NR);	// 91 00 3C 00 3D FC ==> set 0 mux delay
		nSent = WriteReg(nDev_ID, 61, 0x00, 0x00, 1, FRMWRT_SGL_NR);	// 91 00 3D 00 3C 6C ==> set 0 initial delay

		// Configure voltage and internal sample period (section 2.2.2)
		nSent = WriteReg(nDev_ID, 62, 0x00, 0xCC, 1, FRMWRT_SGL_NR);	// 91 00 3E CC 3C C9 ==> set 99.92us ADC sampling period

		// Configure the oversampling rate (section 2.2.3)
		nSent = WriteReg(nDev_ID, 7, 0x00, 0x00, 1, FRMWRT_SGL_NR);		// 91 00 07 00 2E CC ==> set no oversampling period

		// Clear and check faults (section 2.2.4)
		nSent = WriteReg(nDev_ID, 81, 0x00, 0x38, 1, FRMWRT_SGL_NR);	// 91 00 51 38 10 BE =====> clear fault flags in the system status register
		nSent = WriteReg(nDev_ID, 82, 0x00, 0xFFC0, 2, FRMWRT_SGL_NR);	// 92 00 52 FF C0 59 AC ==> clear all fault summary flags
	}

	// Select Identical Number of Cells and Channels on All Modules Simultaneously (section 2.2.5.2)
	nSent = WriteReg(0, 13, 0x00, 0x0D, 1, FRMWRT_ALL_NR);				// F1 0D 0D 94 A6  =====> set number of cells to 13
	nSent = WriteReg(0, 3, 0x00, 0x1FFF03C0, 4, FRMWRT_ALL_NR); 		// F4 03 1F FF 03 C0 66 30 ==> select 13 cell, AUX channels 0 and 1, and internal digital die and internal analog die temperatures
}

Is my code wrong?

Do you have any remmend?

Best Regards,

Aaron

main(){
.....
			PL455_Reboot();
			PL455_ClearFault();
			PL455_AutoAddress();
			PL455_EnableCommunication();
			PL455_SetBaudrate();
			PL455_SetCommunication();
			PL455_ClearFault2();
			PL455_SetAFE();
			PL455_SetOVUV();

			for(i=0;i<120;i++)
				bFrame[i]=0;
			PL455_BrocastRequest(bFrame);			// Measure Cell Voltage

.....
}