SLUUCC3 february   2021 BQ79631-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4.   General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines
  5. 1General Description
    1. 1.1 Key Features
      1. 1.1.1 Key Electrical Parameters
  6. 2Theory of Operation
    1. 2.1 Single Board
    2. 2.2 Stacked Systems
  7. 3Connectors
    1. 3.1 Powering the BQ79631EVM
    2. 3.2 Primary Input and Output Connectors
      1. 3.2.1 Jumper Placements
      2. 3.2.2 Host Interface
      3. 3.2.3 High-Side and Low-Side Communications
    3. 3.3 High Voltage Networks
      1. 3.3.1 High Voltage Safety Considerations
      2. 3.3.2 High Voltage Connections
      3. 3.3.3 High Voltage Alternatives
      4. 3.3.4 Switches
      5. 3.3.5 Buffers
      6. 3.3.6 Insulation Detection Network
    4. 3.4 Current Sense
      1. 3.4.1 SRP/SRN
      2. 3.4.2 VCSamp_Out
    5. 3.5 GPIO Connections
  8. 4Quick Start Guide
    1. 4.1 Launch Pad Connection and Example Code
      1. 4.1.1 Required Devices for Using the Example Code
      2. 4.1.2 Power Connections
      3. 4.1.3 Connecting the EVM to the TMS570 LaunchPad
      4. 4.1.4 Software
    2. 4.2 USB2ANY Connection with GUI
      1. 4.2.1 GUI
      2. 4.2.2 GUI UART Connection
  9. 5Physical Dimensions
    1. 5.1 Board Dimensions
  10. 6BQ79631-Q1 EVM Schematic, Assembly, Layout, and BOM
    1. 6.1 Schematics
    2. 6.2 Layout
    3. 6.3 Bill of Materials

1 General Description

TI's BQ79631EVM is an evaluation board for the BQ7963X-Q1 family of devices used in EV/HEV applications to provide monitoring, protecting, and communications through measuring divided down high voltage in the battery junction box (BJB) or battery disconnect unit (BDU) system.

The BQ79631EVM is equipped with 16 differential voltage sense inputs to measure across the battery pack, fuse, drive train link, and fast charging connections. The two voltage sense pins (VC14, VC15) connected to HV_Extra1_Plus and HV_Extra2_Plus can be used to measure other parameters within the HV system. An insulation detection circuit is also present on the BQ79631EVM to verify that all high voltage networks are properly insulated from low voltage ones. All differential voltage sense inputs are integrated post ADC in digital low pass filters.

In addition to the voltage sense pins, the BQ79631EVM has integrated current sense with a low shunt resistor. There are also 8 GPIOs/auxiliary inputs that can be used to measure additional voltages, NTC thermistors, and drive relays.

Bi-directional daisy chain ports are also present on the BQ79631EVM and support capacitor, capacitor and choke, and transformer based isolation.

Control of a single EVM or multiple stacked EVMs is accomplished by using a PC-hosted GUI. Communication between the PC and the bridge device occurs via a USB2ANY UART interface. When using the BQ7963x in a system of other stacked BQ796XXEVM devices, communication between all other EVMs in the stack occurs via the isolated, daisy-chain differential communication bus.

The PC GUI allows the configuration of all BQ796XXEVMs to monitor cells and other analog data channels, control balancing, and monitor details of any faults. For more information on the installation and use of the BQAutoEval GUI, please refer to the BQ79616-Q1 and BQ75614-Q1 GUI User's Guide.

For more information on specific details pertaining to the BQ79616EVM, please refer to the BQ79616-Q1, BQ75614-Q1, and BQ79656-Q1 Evaluation Modules User's Guide.