SLUUD64 December   2024 BQ41Z90

 

  1.   1
  2.   Description
  3.   Features
  4.   4
  5. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
      1. 1.4.1 Before You Begin
  6. 2BQ41Z90EVM Quick Start Guide
    1. 2.1 Items Needed for EVM Setup and Evaluation
    2. 2.2 Software Installation
    3. 2.3 EVM Connections
      1. 2.3.1 Jumper Description
    4. 2.4 Update Firmware
  7. 3Hardware
    1. 3.1 BQ41Z90 Production Calibration Guide
  8. 4Software
    1. 4.1 Battery Management Studio
      1. 4.1.1 Registers Screen
      2. 4.1.2 Setting Programmable BQ41Z90 Options
      3. 4.1.3 Calibration Screen
        1. 4.1.3.1 Voltage Calibration
        2. 4.1.3.2 Temperature Calibration
        3. 4.1.3.3 Current Calibration
      4. 4.1.4 Chemistry Screen
      5. 4.1.5 Firmware Screen
        1. 4.1.5.1 Programming the Flash Memory
        2. 4.1.5.2 Exporting the Flash Memory
      6. 4.1.6 Advanced Comm SMB Screen
  9. 5Hardware Design Files
    1. 5.1 BQ41Z90EVM Circuit Module Schematic
    2. 5.2 Circuit Module Physical Layouts
      1. 5.2.1 Board Layout
      2. 5.2.2 Schematic
    3. 5.3 Bill of Materials
  10. 6Additional Information
    1. 6.1 Trademarks
  11. 7Related Documentation from Texas Instruments

2.3 EVM Connections

This section covers the hardware connections for the EVM. See Figure 2-1 and Figure 2-2.

BQ41Z90 BQ41Z90 Circuit Module Connection to Cells and System Load or Charger, Parallel Configuration Figure 2-1 BQ41Z90 Circuit Module Connection to Cells and System Load or Charger, Parallel Configuration

BQ41Z90 BQ41Z90 Circuit Module Connection to Cells and System Load or Charger, Series Configuration

Figure 2-2 BQ41Z90 Circuit Module Connection to Cells and System Load or Charger, Series Configuration

Direct connection to the cells: 1N (BAT–), 1P, 2P, 3P, 4P, 5P, 6P, 7P, 8P, 9P, 10P, 11P, 12P, 13P, 14P, 15P, 16P (BAT+).

Attach the cells as shown in Figure 2-1. A specific cell connection sequence is required along with shorts across unused voltage sense inputs. See Figure 2-3.


BQ41Z90 Cell Connection Configuration

Figure 2-3 Cell Connection Configuration
Note: The BQ41Z90 needs at least 3 cells attached for proper configuration.

A resistor cell simulator can be used instead of battery cells. Connect a resistor between each of the contacts on the J1, J8, and J9 Jumper. For example, following the connections in Figure 2-3 place resistors where cells are to be connected and place external shorts in the remaining terminal slots until the desired number of slots is achieved. A power supply can provide power to the cell simulator. Set the power supply to the desired cell voltage × the number of cells, and attach the ground wire to 1N and the positive wire to 16P. For example, for a 3S configuration with a 3.6V cell voltage, set the power supply to 10.8V (3 × 3.6 = 10.8V).

  • Communications ports

    For SMB attach the communications interface adapter cable to J11 and to the SMB port on the EV2400.

    For I2C attach the communications interface adapter cable to J21 and to the I2C port on the EV2400.
  • System load and charger connections across PACK+ and PACK–

    For Parallel configuration, attach the positive load wire to the J46 terminal block, labeled DPACK+. The ground wires for the load must be connected to the J47 terminal block, labeled PACK-. Connect the positive charger wire to the J44 terminal block, labeled CPACK+. The ground wire for the charger must be connected to the J47 terminal block, labeled PACK-. See Figure 2-1.

    For Series configuration, attach the positive load or charger wire to the PACK+ end of the J47 terminal block. Attach the ground wires for the load or charger to the PACK- end of the J47 terminal block. See Figure 2-2.
  • System-present pin (PRES/SHUTDN)

    To start charge or discharge test, connect the PRES/SHUTDN position on the J 1 terminal block to PACK–. The PRES/SHUTDN can be left open if the non-removable (NR) bit is set to 1 in the Settings:Configuration:DA Configuration register. To test sleep mode, disconnect the PRES/SHUTDN pin.

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

    Press the Wake pushbutton switch to temporarily connect Bat+ to Pack+. This applies voltage to the PACK pin on the BQ41Z90 to power-up the regulators and start the initialization sequence.

  • Parameter setup

    The default data flash settings configure the device for 3-series Li-Ion cells. The user must change the Settings:Configuration:DA Configuration register to set up the number of series cells to match the physical pack configuration. This provides basic functionality to the setup. Other data flash parameters must also be updated to fine tune the gauge to the pack. For help with setting the parameters, see the BQ41Z90 Technical Reference Manual.