I2C Multiplexer Testing Summary
Explore the results of testing the I2C multiplexer with a focus on obtaining Chem ID/Battery Type from the fuel gauge. Hardware results captured using an oscilloscope and I2C data read via UART serial communication. Discover the challenges faced and outcomes for each channel tested.
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Presentation Transcript
I2C Mux Schematic NOTE: For the testing, we are testing U501 - one channel only; either Channel 0 or Channel 2. MCU
I2C Mux Testing Summary Tested I2C Mux 1 (U501) Channel 0, Channel 1 and Channel 2 For the testing we focused on getting the Chem ID/Battery Type from the fuel gauge which is supposed to be 0x2158. Hardware results taken using oscilloscope. I2C data read using UART serial comm HyperTerminal. I2C Multiplexer I2C Protocol Hardware Result HyperTerminal Result Slide 1. Slave address format: 0xE0 + <values of A2-A0> + R/W No slave output Chem ID not accurate 4 2. Add I2C Write 0x04 to Slave Address 0xE6 Has slave output Chem ID not accurate 5 3. I2C Write 0x04 to Slave Address 0x73 (TI advice to use 0x73) No slave output Wrong slave address detected 6 4. I2C Write on I2C Mux Address, Channel Select, FG Add, ChemID Has slave output Chem ID not accurate 7 5. (TI advice) Start, I2C MUX ADDRESS [ACK], Channel Select [ACK], Stop Start, CH Slave Address [ACK], Send pointer byte or data [ACK], NACK Stop Has slave output Chem ID not accurate 8 Note: Testing used UART HyperTerminal to read the I2C data.
Testing 1: Slave address format: 0xE0 + <values of A2-A0> + R/W
Testing 2: I2C Write 0x04 to Slave Address 0xE6 TI advised to add an I2C Write 0x04.
Testing 3: I2C Write 0x04 to Slave Address 0x73 I2C Master Data I2C Master Clock I2C Slave Data I2C Slave Clock Detected 230 (E6h) when it is supposed to be 115 (73h).
Testing 4: I2C Write on I2C Mux Address, Channel Select, FG Add, ChemID U501 MUX 1 Channel Selected: Channel 2 I2C Master Data I2C Master Clock I2C Slave Data I2C Slave Clock
Testing 5: Send 0x06 to 0xE6, Send ALtMfrAccess to 0xAA, I2C Read 0xAB
