Connection with LC709203F, Address should be 0x16, is 0xB, NACK received

AloyseTech · October 14, 2015, 7:44am

Hi,

I'm trying to communicate with an LC709203F Lipo gauge from ON semi. It's an I2C device with hardcoded address 0x16 (Datasheet, p.8). At least, it should be...

I'm running a custom arduino zero on my own PCB, every other I2C devices are working fine. When I run the I2C scanner, I get all the good address response for each device, but not for the LC709203F. I get address 0xB (decimal 11) instead of 0x16...
When I try to communicate with the device, I only get 0xFFFF, even for register that should not contain any value beyond 0x0064...

The IC is powered with a 250mah Lipo that works fine. The schematic is exactly the one from the datasheet. The hardware seems to be OK.

Datasheet : Battery Fuel Gauges
Library code : https://github.com/AloyseTech/Oleduino-Color/blob/master/Libraries/BatteryMonitor.h

Any idea is welcome...

AloyseTech · October 30, 2015, 10:32pm

Up...

mvdzwaan · May 29, 2017, 2:00pm

A bit late response, but I'm using the LC709203F as well....

The documentation is in error. It states

IC address [Slave Address] : 0x16 (It becomes "0001011X" when you write a binary, because the slave address is 7 bits. [X]=Rd/Wr.)

But the address is 0xB which becomes 0x16 when shifted because of the 7 bit adressing.

I did not manage to get it working yet, I get 0xabfd on every request I perform (0x11, version for instance). As I do not get 0xffff, the chip is responding....

anon28817713 · June 14, 2019, 8:38am

I know probably no one will see this since its been so long ago that this topic went up. But here it goes anyway. I'm also trying to talk to the LC709203F. I ran the scanner and i am also seeing the 0x0B. It makes sense that this is the address because the 7 bit address (its based on the last bit taken off). eg

0001011 --> 0x0B,
00010110 --> 0x16,
00010111 --> 0x17

Its usually pretty standard with I2C devices that the last bit is the read or write bit for 8-bits. The 7-bit hex value is the address.

Did you get any further with this. Hopefully this will end up in one of your email notifications.

Thanks.

sherzaad · June 14, 2019, 8:44am

I actually found a library for it (RIOT/drivers/lc709203f at master · RIOT-OS/RIOT · GitHub) but it would require you making some changes to it to be arduino compatible :-\ ...

AloyseTech · June 14, 2019, 8:46am

Hi didn’t get any further with this project. But I did work on this gauge in another projet. I was able to communicate with it but never get it out of sleep mode...

anon28817713 · June 14, 2019, 10:49am

I was trying to use another library that i found,

github.com

rkiyak/LC709203F/blob/master/LC709203F.c

/*
  @
  @   Date               :        13.08.2018 / Monday
  @
  @   Contact            :        Editing by Muhammet Rasit KIYAK                    
                                  @https://www.linkedin.com/in/mrstkyk/
  @                               mrstkyk@gmail.com 
  @
  @   Description        :        This Library for LC709203F Gauge Sensor
  @
*/


/* 
   @Brief         CRC Checker
   @Description   Needed byte for Cyclic Redundancy Check.
                  LC709203_DeviceID, Control Reg, LSB Byte, MSB Byte, CRC Byte 
   @Parameter     uint8_t *rec_values -> array name for check
                  uint8_t len         -> lengt of array
   @Return value  uint8_t

This file has been truncated. show original

However adapting the HAL libraries to arduino is challenging.

Thats a pity. I'll see where i get with it anyway.

Well thanks for the surprisingly quick response given that this was asked 4 years ago. :o

AloyseTech · June 14, 2019, 1:17pm

Do you have a logic analyzer? If not you should try the cheap 24MHz ones available on eBay or AliExpress. They are very useful for debugging this kind of issue.

anon28817713 · June 14, 2019, 1:49pm

So I actually found code that seems to be working for getting the voltage readings so far anyway I havent set it up for the specific battery i m using so I havent seen the battery capacity values yet.

Here is the link for arduino based code. If you click on it, it should just directly download the .cpp file. I have no idea where the original project is coming from. I was looking through the hackaday website for the power bank project but couldnt find it.

https://cdn.hackaday.io/files/262911124834144/charge-n-boost.cpp

One of the things thats missing is the CRC_TABLE for the CRC check. So i replaced this with a crc table that i found in the following link

So far the voltage being read from the battery monitor seems to be closely matching the voltage of the voltmeter that i have. However, I still need to investigate if this CRC table is right.

I do have an oscilloscope and it does appear to be showing returning bytes that i request.

kamy_arduino · July 25, 2019, 2:41pm

Hi,
I am also facing issues with LC709203F.
In my setup, I am using the STM32L1 series controller. But unable to communicate with LC709203F over I2C. The setup has one more I2C slave IC and its working fine. Hence I2C lines of the controller are okay.

""I2C_Send7bitAddress(I2C1, 0x16, I2C_Direction_Transmitter); ""

The above command is not executed. Please let me know if anyone here has been successful with LC709203F.

And, what about the slave address? Is it 0x16 OR 0x0B ??

Thanks

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Connection with LC709203F, Address should be 0x16, is 0xB, NACK received

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