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Original question:

BQ27411-G1: State Of Charge (SOC) value is 100% for every inputs

BQ27411-G1: Battery Not Detecting by IC

Harikumar Namboothiri
Prodigy 50 points
Part Number: BQ27411-G1 

/*
Change Design Capacity to 2200mAh
*/


I2C Write 0x8000 to 0x00	        //UNSEAL it by sending 0x8000 to Control() (0x00 and 0x01) twice
I2C Write 0x8000 to 0x00
I2C Write 0x0013 to 0x00	        //Send SET_CFGUPDATE subcommand, Control(0x0013)
I2C Read 0x06               		//Confirm CFGUPDATE mode by polling Flags() register until bit 4 is set
I2C Write 0x00 to 0x61			    //Write 0x00 using BlockDataControl() command (0x61) to enable block data memory control
I2C Write 0x52 to 0x3E		        //Write 0x52 using the DataBlockClass() command (0x3E) to access the State subclass (82 decimal, 0x52 hex) containing the Design Capacity parameter
I2C Write 0x00 to 0x3F			    //Write the block offset location using DataBlock() command (0x3F).
                                    //Note: To access data located at offset 0 to 31, use offset = 0x00. To access data located at offset 32 to 41, use offset = 0x01.
I2C Read 0x60               		//Read the 1-byte checksum using the BlockDataChecksum() command (0x60) (Obtained checksum = 0x12)
I2C Read 0x4A               		//Read both Design Capacity bytes starting at 0x4A (offset = 10). Block data starts at 0x40, so to read the data of a specific offset, use address 0x40 + mod(offset, 32).
I2C Read 0x4B
I2C Write 0x08 to 0x4A  			//Write both Design Capacity bytes starting at 0x4A (offset = 10). the new value is 2200 mAh. (0x0898 hex)
I2C Write 0x98 to 0x4B
I2C Write 0x72 to 0x60  			//Write New Checksum (0x72 by checksum calculation as mentioned in technical reference)
I2C Write 0x0042 to 0x00        	//Soft Reset to exit CFGUPDATE Mode
I2C Read 0x06               		//Confirm CFGUPDATE has been exited by polling Flags() register until bit 4 is cleared. 
I2C Write 0x0020 to 0x00        	//Return to SEALED mode
/*
Change clear the OpConfig[BIE] to 0
*/


I2C Write 0x8000 to 0x00	        //UNSEAL it by sending 0x8000 to Control() (0x00 and 0x01) twice
I2C Write 0x8000 to 0x00
I2C Write 0x0013 to 0x00	        //Send SET_CFGUPDATE subcommand, Control(0x0013)
I2C Read 0x06               		//Confirm CFGUPDATE mode by polling Flags() register until bit 4 is set
I2C Write 0x00 to 0x61			    //Write 0x00 using BlockDataControl() command (0x61) to enable block data memory control
I2C Write 0x40 to 0x3E		        //Write 0x52 using the DataBlockClass() command (0x3E) to access the State subclass (64 decimal, 0x40 hex) containing the OpConfig parameter
I2C Write 0x00 to 0x3F			    //Write the block offset location using DataBlock() command (0x3F).
                                    //Note: To access data located at offset 0 to 31, use offset = 0x00. To access data located at offset 32 to 41, use offset = 0x01.
I2C Read 0x60               		//Read the 1-byte checksum using the BlockDataChecksum() command (0x60) (Obtained checksum = 0x5E)
I2C Read 0x40               		//Read both Design Capacity bytes starting at 0x40 (offset = 00). Block data starts at 0x40, so to read the data of a specific offset, use address 0x40 + mod(offset, 32).
I2C Read 0x41
I2C Write 0x05 to 0x4A  			//Write both Design Capacity bytes starting at 0x4A (offset = 10). the new value is 2200 mAh. (0x05F8 hex)
I2C Write 0xF8 to 0x4B
I2C Write 0x61 to 0x60  			//Write New Checksum (0x61 by checksum calculation as mentioned in technical reference)
I2C Write 0x0042 to 0x00        	//Soft Reset to exit CFGUPDATE Mode
I2C Read 0x06               		//Confirm CFGUPDATE has been exited by polling Flags() register until bit 4 is cleared. 
I2C Write 0x0020 to 0x00        	//Return to SEALED mode

Hi friends!

I'm trying to capture the Voltage, Current, State of Charge (SOC) of a Li-Ion battery using BQ27411-G1A. I'm able to read the Voltage, Current and Power but the SOC value I'm getting is wrong. I'm getting the SOC value 100% sometimes, and 0% sometimes.

By reading the Flag Register (0x06-0x07), I found that the IC is unable to detect the battery and Flags [BAT_DET] is 0 for all the time. Then I tried to re-configure the OpConfig register (0x3A-0x3B) to change the OpConfig[BIE] pin to 0 so that I can manually give input to the IC about Battery Insertion. Following are the steps I did for this.

  • Powered ON the board with a DC adapter without battery.
  • Changed the "Design Capacity" value to 2200mAh (I'm using a 3.7V, 2200mAh, Li-Ion 18650 cylindrical battery). The pseudo code is attached.
  • Changed the "OpConfig" register value to 0x05F8 to clear the OpConfig[BIE] to 0. This step is done to disable the [BIE] bit and manually enter the battery insertion from host. The pseudo code is attached.
  • Plugged in the battery.
  • Wrote BAT_INSERT Subcommand (0x000C) using the Control Register (0x0000) to Force the Flags() [BAT_DET] bit set since the OpConfig [BIE] bit is 0.
    "I2C Write 0x000C to 0x00"

Now I tried to read the SOC Register (0x1C-0x1D) but the value I'm getting is 0x00 and the flag bit [BAT_SET] is cleared to 0 for all the time. But the voltage, current and power values are correct.

Is there anything missed in the process? Or anything wrong with the logic / code?

Any help is appreciated.

-Thanks in Advance

Hari