SLUUCQ5 March   2023 BQ28Z620

 

  1. 1BQ28Z620EVM 1- to 2-Series Li-Ion Battery Pack Manager Evaluation Module
    1. 1.1 Features
      1. 1.1.1 Kit Contents
      2. 1.1.2 Ordering Information
      3. 1.1.3 Documentation
      4. 1.1.4 BQ28Z620 and BQ294502 Circuit Module Performance Specification Summary
    2. 1.2 BQ28Z620EVM Quick Start Guide
      1. 1.2.1 Items Needed for EVM Setup and Evaluation
      2. 1.2.2 Software Installation
      3. 1.2.3 EVM Connections Module Connections
    3. 1.3 Battery Management Studio
      1. 1.3.1 Starting the Program
      2. 1.3.2 Registers Screen
      3. 1.3.3 Data Memory Screen
      4. 1.3.4 Calibration Screen
        1. 1.3.4.1 Voltage Calibration
        2. 1.3.4.2 Temperature Calibration
        3. 1.3.4.3 Current Calibration
      5. 1.3.5 Authentication Screen
      6. 1.3.6 Chemistry Selection
      7. 1.3.7 Programming Screen
        1. 1.3.7.1 Programming the Flash Memory
        2. 1.3.7.2 Generating The Golden Image
      8. 1.3.8 Advanced Comm I2C Screen
      9. 1.3.9 Watch Screen
    4. 1.4 Circuit Module Physical Layouts and Bill of Materials
      1. 1.4.1 Board Layout
      2. 1.4.2 Bill of Materials
      3. 1.4.3 Schematic
      4. 1.4.4 Testing Fuse-Blowing Circuit
  2. 2Revision History

1.2.3 EVM Connections Module Connections

This section covers the hardware connections for the EVM. See Figure 1-1.

GUID-6A1175EB-AF21-43D9-8875-EC7DDDB9017C-low.png Figure 1-1 BQ28Z620 Circuit Module Connection to Cells and System Load or Charger
  • Direct connection to the cells: 1N (BAT–), 1P, 2P (BAT+)

    Attach the cells to the J2 terminal block. A specific cell connection sequence is not required, although it is a good practice to start with lowest cell in the stack (cell1) and then add cell 2. The U1 and U2 devices should not get damaged by other cell connection sequences, but there is a possibility that the BQ294502 could blow the fuse in a module that has one. Attaching cells starting with cell 1 should eliminate this risk.

    GUID-F3ADD819-26A9-4466-92C1-62E41DF75EEF-low.gif Figure 1-2 Cell Connection Configuration

    A resistor cell simulator can be used instead of battery cells. Connect a resistor between each of the contacts on the J2 connector; that is, from 1N to 1P and from 1P to 2P. If being used for a 1-series configuration no resistor is needed, simply short 1P and 2P. A power supply can provide power to the cell simulator. Set the power supply to the desired cell voltage x the number of cells and attach the ground wire to 1N and the positive wire to 2P. For example, for a 2-series configuration with a 3.6-V cell voltage, set the power supply to 2 × 3.6 = 7.2 V.

  • I2C™ (SDA, SCL)

    Attach the communications interface adapter cable to J3 and to the I2C™ port on the EV2400.

    Note:

    The EV2400 has internal pull-up resistors, P2 and P3 jumpers can be left floating.

  • System load and charger connections across PACK+ and PACK–

    Attach the load or power supply to the J1 terminal block. The positive terminal of the load or power supply wire should be connected to the terminal block position labeled PACK+. The ground wire for the load or power supply should be connected to the other terminal block position labeled PACK–.

  • Wake-up the device up from SHUTDOWN (WAKE)

    Press the Wake pushbutton switch S1 to temporarily connect BAT+ to PACK+. This applies voltage to the PACK pin on the BQ28Z620 to power-up the regulators and start the initialization sequence.

  • Parameter setup

    The default data flash default settings is configured for 2-series Li-ion cells. The user should change the | Data Memory | Settings | DA Configuration register to set up the number of series cells to match the physical pack configuration by clearing the CCO flag for 1-series configuration or setting it for 2-series configuration. This provides basic functionality to the setup. Other data flash parameters should also be updated to fine tune the gauge to the pack. See the BQ28Z620 Technical Reference Manual for help with setting the parameters.