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

3.3.4 Switches

In each of the high voltage networks on the BQ79631EVM, there are MOSFET switches controlled by GPIO pins that can disconnect the high voltage inputs from the rest of the network. These switches must always remain on while a measurement is taking place but can be turned off to block any leakage current from escaping the battery pack while not in use. These switches are controlled by the GPIO2 pin by default, but switches connected to the HV_Plus and HV_Fuse network can be controlled by GPIO4 by moving the shunt from pins 1-2 over to pins 2-3 on jumpers J9 and J12, respectively.

GUID-20200717-CA0I-GZRQ-HDPL-2K6JLX81DM7D-low.png Figure 3-4 GPIO4 Control Option

To close the switch and enable current to flow through each network, the user must set the associated GPIO pin to output high from within the GUI.

If the user wishes to use the EVM to test without use of the included switches, then simply populate the following resistor slots with a 0-Ω resistor.

Table 3-7 Resistors
Resistor # on EVM Switch Being Bypassed Network
R39 Q2 HV_Plus
R40 Q3 HV_Fuse
R17 Q1 Charge_Plus
R73 Q5 Charge_Neg
R113 Q6 Insulation Detection