SLUUBT4B June   2018  – June 2025 BQ40Z80

 

  1.   1
  2.   Description
  3.   Features
  4.   4
  5. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Ordering Information
    4. 1.4 BQ40Z80 and BQ771807 Circuit Module Performance Specification Summary
  6. 2Hardware
    1. 2.1 BQ40Z80EVM Quick Start Guide
      1. 2.1.1 Items Needed for EVM Setup and Evaluation
      2. 2.1.2 Software Installation
      3. 2.1.3 EVM Connections
      4. 2.1.4 Update Firmware
    2. 2.2 Battery Management Studio
      1. 2.2.1 Registers Screen
      2. 2.2.2 Setting Programmable bq40z80 Options
      3. 2.2.3 Calibration Screen
        1. 2.2.3.1 Voltage Calibration
        2. 2.2.3.2 Temperature Calibration
        3. 2.2.3.3 Current Calibration
      4. 2.2.4 Chemistry Screen
      5. 2.2.5 Firmware Screen
        1. 2.2.5.1 Programming the Flash Memory
        2. 2.2.5.2 Exporting the Flash Memory
      6. 2.2.6 Advanced Comm SMB Screen
  7. 3Hardware Design Files
    1. 3.1 bq40z80EVM Circuit Module Schematic
      1. 3.1.1 Precharge
      2. 3.1.2 Predischarge
      3. 3.1.3 LED Control
      4. 3.1.4 Emergency Shutdown
      5. 3.1.5 Testing Fuse-Blowing Circuit
    2. 3.2 Circuit Module Physical Layouts
      1. 3.2.1 Board Layout
      2. 3.2.2 bq40z80RevA Schematic
    3. 3.3 bq40z80EVM Bill of Materials
  8. 4Additional Information
    1. 4.1 Trademarks
  9. 5Related Documentation from Texas Instruments
  10. 6Revision History

2.1.3 EVM Connections

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

BQ40Z80EVM-020 BQ40Z80 Circuit Module Connection to Cells and System Load or ChargerFigure 2-1 BQ40Z80 Circuit Module Connection to Cells and System Load or Charger
  • Direct connection to the cells: 1N (BAT–), 1P, 2P, 3P, 4P, 5P, 6P, 7P (BAT+)

    Attach the cells to the J12 terminal block. A specific cell connection sequence is not required; although, a good practice is to start with lowest cell in the stack (cell 1), then attach cells 2 through 7 in sequence. The U1 and U2 devices is not damaged by other cell connection sequences, but there is a possibility that the BQ771807 can blow the fuse. Attaching cells starting with cell 1 eliminates this risk. A short needs to be placed across unused voltage sense inputs up to 7P.

    Table 2-1 Cell Connection Configuration
    Number of Cells J12 Terminal Block Connections
    1N 1P 2P 3P 4P 5P 6P 7P
    1 ⊕ -cell1+ ⊕ short ⊕ short ⊕ short ⊕ short ⊕ short ⊕ short ⊕
    2 ⊕ -cell1+ ⊕ -cell2+ ⊕ short ⊕ short ⊕ short ⊕ short ⊕ short ⊕
    3 ⊕ -cell1+ ⊕ -cell2+ ⊕ -cell3+ ⊕ short ⊕ short ⊕ short ⊕ short ⊕
    4 ⊕ -cell1+ ⊕ -cell2+ ⊕ -cell3+ ⊕ -cell4+ ⊕ short ⊕ short ⊕ short ⊕
    5 ⊕ -cell1+ ⊕ -cell2+ ⊕ -cell3+ ⊕ -cell4+ ⊕ -cell5+ ⊕ short ⊕ short ⊕
    6 ⊕ -cell1+ ⊕ -cell2+ ⊕ -cell3+ ⊕ -cell4+ ⊕ -cell5+ ⊕ -cell6+ ⊕ short ⊕
    7 ⊕ -cell1+ ⊕ -cell2+ ⊕ -cell3+ ⊕ -cell4+ ⊕ -cell5+ ⊕ -cell6+ ⊕ -cell7+ ⊕

    A resistor cell simulator can be used instead of battery cells. Connect a resistor between each of the contacts on the J12 connector. For example, from 1N to 1P, from 1P to 2P, and so forth, until the desired number of cells has been 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 4P. For example, for a 6S configuration with a 3.6V cell voltage, set the power supply to 6 × 3.6 = 21.6V.

  • Serial communications port (SMBC, SMBD)

    If the external EV2400 is used, then attach the communications interface adapter cable to J19 and to the SMB port on the EV2400. The jumper settings for J18 are to connect pins 2 and 3, and the jumper settings for J22 are to connect pins 1 and 2. This allows the external EV2400 to talk to the BQ40Z80 over SMBus.

    Alternately, the onboard EV2400 can be used by connecting a micro-USB cable to the EVM at J23 directly to a computer. To use the onboard EV2400, the jumper settings for J18 are to connect pins 1 and 2, and the jumper settings for J22 are to connect pins 2 and 3. This allows the onboard EV2400 to talk to the bq40z80 over SMBus.

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

    Attach the load or power supply to the J1 terminal block. Connect the positive load or power supply wire to at least one of the first two terminal block positions labeled PACK+. Connect the ground wire for the load or power supply to the last terminal block positions labeled PACK–.

  • System-present pin (SYS PRES)

    To start charge or discharge test, connect the SYS PRES position on the J1 terminal block to PACK–. The SYS PRES can be left open if the nonremovable (NR) bit is set to 1 in the Pack Configuration A register. To test sleep mode, disconnect the SYS PRES pin.

  • 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 BQ40Z80 to power-up the regulators and start the initialization sequence.

  • Parameter setup

    The default data flash settings configure the device for 7-series Li-Ion cells. Change the Data Flash > Settings > DA Configuration register to set up the number of series cells to match the physical pack configuration. This provides basic functionality to the setup. Update other data flash parameters to fine tune the gauge to the pack. See the BQ40Z80 TRM for help with setting the parameters.