SLUUD32A June   2024  – April 2025 BQ41Z50

 

  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
  6. 2BQ41Z50EVM 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 Connectors
        1. 2.3.1.1 Primary Input and Output Connectors
        2. 2.3.1.2 Jumper Placements
        3. 2.3.1.3 Battery Connector
        4. 2.3.1.4 Load/Charger Connector
        5. 2.3.1.5 GPIO Connector
    4. 2.4 Update Firmware
  7. 3Hardware
    1. 3.1 BQ41Z50 Production Calibration Guide
  8. 4Software
    1. 4.1 Battery Management Studio
      1. 4.1.1 Registers Screen
      2. 4.1.2 Setting Programmable BQ41Z50 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 Programming 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. 5IT-DZT Guide To Gauging
    1. 5.1 What is Dynamic Z-Track™ (IT-DZT)?
    2. 5.2 Overview of IT-DZT
    3. 5.3 Critical IT-DZT Parameters
    4. 5.4 IT-DZT Chemistry Details
    5. 5.5 Implementation of Dynamic Load (IT-DZT)
    6. 5.6 Results
  10. 6Hardware Design Files
    1. 6.1 BQ41Z50EVM Circuit Module Schematic
      1. 6.1.1 LED Control
    2. 6.2 Circuit Module Physical Layouts
      1. 6.2.1 Board Layout
      2. 6.2.2 Schematic
    3. 6.3 Bill of Materials
  11. 7Additional Information
    1. 7.1 Trademarks
  12. 8Related Documentation
  13. 9Revision History

2.3 EVM Connections

This section covers the hardware connections for the EVM.

BQ41Z50EVM BQ41Z50 Circuit Module Connection to Cells and System Load or ChargerFigure 2-1 BQ41Z50 Circuit Module Connection to Cells and System Load or Charger
Note: To avoid damaging the device and the surrounding passive components, remove J2 before flashing a new firmware.
  • Direct connection to the cells: 1N (BAT–), 1P, 2P, 3P, 4P (BAT+)
  • Attach the cells as shown in Figure 2-1. It is best practice to start with the lowest cell in the stack (cell 1), then attach cells 2 through 4 in sequence. Other cell connection sequences can potentally damage the U1 and U4 components, which can cause the fuse to blow. If using a 2-cell or 3-cell configuration, confirm a short is placed across the unused voltage inputs. For more details, see Figure 2-2.
BQ41Z50EVM Cell Connection ConfigurationFigure 2-2 Cell Connection Configuration
Note:

The BQ41Z50 requires at least 2 attached cells for proper functionality.

  • Serial communications port (SMBC, SMBD)
    • Attach the communications interface adapter cable to J3 and to the SMB port on the EV2400 or EV2500.
  • System load and charger connections across PACK+ and PACK–
    • Attach the load or power supply to the J1 terminal block. The positive load or power supply wire must be connected to at least one of the first two terminal block positions labeled PACK+. The ground wire for the load or power supply must be connected to the last terminal block positions labeled PACK–.
  • System-present pin (PRES/SHUTDN)
    • To start charge or discharge test, connect the PRES/SHUTDN position on the J1 terminal block to PACK–. The PRES/SHUTDN pin is sampled by the BQ41Z50 every 250ms, so this connection will need to be kept for the duration of the test. 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 push-button switch to temporarily connect Bat+ to Pack+. This applies voltage to the PACK pin on the BQ41Z50 to power-up the regulators and start the initialization sequence. If Settings:Configuration:DA Configuration is correctly configured to reflect the amount of cells in use, then this button only needs to be held for a few seconds. If not, it needs to be held until the setting has been changed.
  • 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 for 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 BQ41Z50 Technical Reference Manual.