some questions about Bq34z110

Stefan,

Your process looks correct. Could you have some other polling for the bq34z110 on occurring on the bus? Data from the Control register can change as the firmware is running. The firmware uses this register in addition to it being the port for the Control Subcommands. Here is a document that covers communications to the device and it has an example of reading the ChemID. Have you tried using the EV2300 and bqEVSW to read the ChemID?

Tom

1641.bq34z100 DF access.pdf

Tom,

I use EV2300 communicate with bq34z110 again ,and the data get returned correctly, I'm sure there is something wrong with my I2C interface, I put my code here, could you please check the logical steps for me?

Is there any rule about SCL and SDA when there are in idle condition ?

void IIC_Start(void)
{
	SDA_OUT(); 
    
	IIC_SDA_1;
 	Delay_us(i2c_delayus_num);
	
	IIC_SCL_1;
	Delay_us(i2c_delayus_num);
	
	IIC_SDA_0;
 	Delay_us(i2c_delayus_num);
	
	IIC_SCL_0;
	Delay_us(i2c_delayus_num);
}	  

void IIC_Stop(void)
{
	SDA_OUT();

	IIC_SCL_0;
	IIC_SDA_0;
 	Delay_us(i2c_delayus_num);
	
	IIC_SCL_1;
	Delay_us(i2c_delayus_num);
	
	IIC_SDA_1;
	Delay_us(i2c_delayus_num*2);
}
 
void IIC_Send_Byte(u8 txd)
{                        
	u8 t,ack=0,temp; 
	
	SDA_OUT(); 	    
	IIC_SCL_0;
	temp=txd;
	t=0x08;
	while(t!=0)
	{
		if (temp & 0x80)                        
			IIC_SDA_1;                               
		else
			IIC_SDA_0;                              
		Delay_us(i2c_delayus_num);                          
		IIC_SCL_1;                                 
		Delay_us(i2c_delayus_num);            
		temp = (temp << 1);             
		IIC_SCL_0;                           
		t = (t - 1);
	}
	IIC_SDA_0;
	Delay_us(i2c_delayus_num);
	IIC_Ack();
} 

u8 IIC_Read_Byte(unsigned char ack)
{
	unsigned char i,receive=0;
	
	SDA_IN();
	for(i=0;i<8;i++ )
	{
		IIC_SCL_0; 
		Delay_us(i2c_delayus_num);
		IIC_SCL_1;
		receive<<=1;
		if(READ_SDA)receive++;   
		Delay_us(i2c_delayus_num); 
	}
	SDA_OUT();
	if(ack)	
		IIC_SDA_0;
	else
		IIC_SDA_1;
	IIC_SCL_0; 
	Delay_us(i2c_delayus_num);		
	IIC_SCL_1; 
	Delay_us(i2c_delayus_num);	
	IIC_SCL_0; 
	IIC_SDA_1;
	Delay_us(i2c_delayus_num);
	return receive;
}

u8 IIC_Ack(void)
{
	u8 ack=0;
	
	IIC_SCL_1;
	Delay_us(i2c_delayus_num);
	IIC_SCL_0;
	Delay_us(i2c_delayus_num/2);
	SDA_IN();
	ack=READ_SDA;
	Delay_us(i2c_delayus_num/4);
	if (ack)                      
		return (1);
	else
		return (0);
}
	    
void IIC_NAck(void)
{
	SDA_OUT();
	IIC_SCL_0;
	IIC_SDA_0;
	Delay_us(i2c_delayus_num);
	IIC_SCL_1;
	IIC_SDA_1;
	Delay_us(i2c_delayus_num);
	IIC_SCL_0;
	Delay_us(i2c_delayus_num/2);
	IIC_SDA_0;
}		
u8 I2C_ReadData(u8 command)  
{                   
	u8 temp=0;                                                                                   

	IIC_Start();              //S	
	IIC_Send_Byte(0xaa);      //ADDR[6:0][0](A) 
	IIC_Send_Byte(command);   //CMD[7:0](A)
	IIC_Stop();               //Sr_p
	IIC_Start();              //Sr_S
	IIC_Send_Byte(0xab);      //ADDR[6:0][1](A)
	temp=IIC_Read_Byte(1);    //DATA[7:0]	
//	IIC_NAck();
	IIC_Stop();
	 
	return temp;  
} 
  
void I2C_WriteData(u8 command, u8 DataToWrite)  
{                                                                                              
	IIC_Start();                 //S
	IIC_Send_Byte(0xaa);         //ADDR[6:0][0](A)
	IIC_Send_Byte(command);      //CMD[7:0](A)
	IIC_Send_Byte(DataToWrite);  //DATA[7:0](A)
//	IIC_NAck();
	IIC_Stop();                  //P 
	Delay_ms(1);       
}

Stefan,

I am not a programmer, but I looked at your code. The read and write routines at the end of the file look correct. I would just have to compare the waveforms from that controller to those from the EV2300.

Tom

Tom，

I can read data from the address of 0x7e / 0x7f， which is 0x00 / 0x01 . But I can't read the correct data form 0x00 / 0x01 after I write 0x00/0x08, the data always be 0x05, I use EV2300 to read it ,and it return 0x05 either .

Why should keep SCL and SDA low for a while ，after send 0xAB，and also after read the first data？

Tom,
Thanks for your reply , now I can read Voltage() from address：0x08/0x09 , and Internal_Temp() from address ：0x2a/0x2b , but how can I initialise the chip ?

The procedure is the same to read all three parameters and I verified this on the bench. Have you checked to see whether you are able to read the Temperature() using the EV2300?

Here are the steps that I used :

1. Read PackConfiguration() : 0x961 .
2. Write 0x00 to 61
3. Write 40H (64 subclass ID) to 3E
4. Write 0x00 (Offset) to 3F
5. Read 20 bytes of data from 40
6. Read the checksum from 60. I read 97H.
7. Calculate new checksum. I calculated it to be A7.
8. Write 0x00 to 61
9. Write 40H (64 subclass ID) to 3E
10. Write 0x00(Offset) to 3F
11. Write 20 bytes of data to 40. I changed the Pack Cfg A from 961 to 951
12. Write A7H to 60.
13. Read the Pack Cfg A and it was 951.

Tom,

I follow the steps you provide , and I'm sure the data has been writen to the flash , but I can not read data from Pack configuration() with reading data from 0x60 , and the data is correct after third read .

Another question I want set Number of Serious cells to 0x0c , so I change offset to 7 , am I right ?

Stefan,

You do not read the Pack Configuration register from 0x60. That is the register where you write the checksum. There is an Extended I2C command available to read the Pack Configuration register. See page 35 of the datasheet. I do not understand the comment about changing the "Number of Serious cells to 0x0c , so I change offset to 7" You can use the bqEVSW to change the Number of Series cells in the Data Flash. Just enter the number that you desire and press <enter>. The value should change and you will need to reset the device for it to take effect.

Tom

Tom ,

In bqEVSW, there's a Calibrate mode with 4 steps that we can calibrate accuracy of Bq34z110 , and I want to do the calibration process by my MCU.

1. Write 0x0081 to command Control() .

2. set number of series cells (12), set VOLTSEL bit of configuration Register Bits to 1 .

3.?

so can you show me what's the next steps?

And I want to know the instantaneous current ,after I write 0x0018 to command Control() , and how can I read it , which command should I read ?

Stefan,

There is a Host side calibration document that was published by another group, but it is applicable to the bq34z110. It provides examples and code and it can be downloaded from the TI website. Search for SLUA640A. There is an error on page 4.The Analog Conversion Counter is at 0x79.

Tom

Tom,

In Calbrate mode , pack current calibation , how to calculate the CC Gain and CC Delta?

I read CC Gain from data flash :0x82 0x4 0x78 0x8c(high to low), and  CC Delta :0x96 0x16 0xb8 0xee(high to low). 

 The bqEVSW shows:CC Gain is 2.304, CC Delta is 2.299.

How bqEVSW translates 0x82 0x4 0x78 0x8c(high to low) into 2.304 and translates 0x96 0x16 0xb8 0xee(high to low) into 2.299 ?

And even I  calculate the CC Gain and CC Delta , how to translate them to 4 bytes in data flash ?

By the way , I try to translate them by C language logic,but faled.