SLAAEB3A May   2023  – July 2024 MSPM0G3507 , MSPM0L1106 , MSPM0L1306

PRODUCTION DATA  

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Hardware Connection
  6. 3Software Structure and Important Functions
    1. 3.1 System Initialization
    2. 3.2 Low-Level Command Control
    3. 3.3 High-Level Function
  7. 4Test Result of Important Functions
    1. 4.1 Read Alarm Status
    2. 4.2 Read Safety Status
    3. 4.3 Read PF Status
    4. 4.4 Read Current
    5. 4.5 Read All Temperatures
    6. 4.6 Read All Voltages
  8. 5References
  9. 6Revision History

2 Hardware Connection

The I2C communication sample code implemented in this application note is based on the BQ76952EVM and MSPM0 LaunchPad™ (LP-MSPM0L1306 and LP-MSPM0G3507). MSPM0 acts as the I2C controller and BQ76952 acts as the peripheral. Figure 2-1 shows the simple system block diagram.

System Block Diagram Figure 2-1 System Block Diagram

For BQ76952EVM, check the BQ76952 chip by bringing the chip up with the onboard MCU (EV2400). Download the latest version of BQSTUDIO (the BQSTUDIO-TEST version) and follow the steps in the quick start section of EVM User Guide.

  1. Connect 10-72V DC power supply capable of 250mA minimum between the BAT- and CELL16 terminals of EVM to power the device.
  2. Connect the USB cable from micro-USB connector on the EVM to the PC. When this is connected, three green LEDs light up.
  3. Check the BQStudio Dashboard on the left side of BQStudio window. The dashboard indicates whether the onboard MCU is connected and which firmware version is being used. The dashboard also indicates whether the BQ76952 device is communicating successfully.

After confirming the BQ76952EVM board works successfully, start setting up the I2C bridge between MSPM0 and BQ769x2. If the USB on BQ769x2 EVM is not powered, remember to remove the connectors on uC_SCL(J19) and uC_SDA(J16).

For MSPM0L1306 and MSPM0G3507 LaunchPad, PA1 is configured as the SCL pin, and PA0 is configured as the SDA pin. The LaunchPad is powered using the USB port on the host computer. Table 2-1 shows the signal and power connections between the two EVMs.

LP-MSPM0G3507 and LP-MSPM0L1306 Hardware Board Figure 2-2 LP-MSPM0G3507 and LP-MSPM0L1306 Hardware Board
Table 2-1 Connecting the EVMs
Connection Type Connection Name LP-MSPM0L1306

Pin Number : Pin Name

 LP-MSPM0G3507

Pin Number : Pin Name

 BQ76952EVM

Pin Number : Pin Name
I2C Interface I2C : SCL PA.1 : I2C0_SCL PA.1 : I2C0_SCL J17-2 : P26
I2C : SDA PA.0 : I2C0_SDA PA.0 : I2C0_SDA J17-3 : P27
Power connections Power : 3.3V J1-1 J1-1 J2-3 : REG1
Power : Ground J1-22 J1-22 J5-1 : VSS

In the I2C interface, besides the connection of SCL and SDA, there are pullup methods on both boards. Select one EVM to pull up the SDA and SCL based on the actual situation.

Short J15 and J18 can pull up the SDA and SCL in the BQ76952EVM. The default value of the pullup resistor is 10kΩ. Adjust the resistor according the I2C bus speed. Figure 2-3 shows the pullup jumper diagram on BQ76952EVM.

3.3V Pullup for SDA and SCL on BQ76952EVM Figure 2-3 3.3V Pullup for SDA and SCL on BQ76952EVM

For the LaunchPad, shorting J9-2-3 and J10-2-3 on LP-MSPM0L1306 or J19-1-2 and J20-1-2 on LP-MSPM0G3507 can pullup the SDA and SCL. The default value of the pullup resistor is 2.2kΩ. The value can also be adjusted according the I2C bus speed. Figure 2-4 shows the pullup jumper diagram on MSPM0L1306 LaunchPad.

3.3V Pullup for SDA and SCL on MSPM0L1306 Figure 2-4 3.3V Pullup for SDA and SCL on MSPM0L1306

Refer to the BQ76952EVM User’s Guide and LP-MSPM0L1306 LaunchPad User’s Guide or LP-MSPM0G3507 LaunchPad User's Guide for instructions to the other parts that are not mentioned.