TIDUF92 December   2025

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Wired System Description
    2. 1.2 Wireless System Description
    3. 1.3 Power Supply Options
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
    3. 2.3 Highlighted Products
      1. 2.3.1 BQ79718B-Q1
      2. 2.3.2 TPS3436-Q1
      3. 2.3.3 TPS715-Q1
      4. 2.3.4 TPD6E004
      5. 2.3.5 CC2662R-Q1
      6. 2.3.6 TXU0204-Q1
      7. 2.3.7 ISO7741-Q1
      8. 2.3.8 ESD2CAN24-Q1
      9. 2.3.9 LM5168-Q1
  9. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
    2. 3.2 Test Setup
      1. 3.2.1 Hardware Setup
      2. 3.2.2 Software Setup
    3. 3.3 Test Results
  10. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
    2. 4.2 Tools and Software
    3. 4.3 Documentation Support
    4. 4.4 Support Resources
    5. 4.5 Trademarks
  11. 5About the Author

1.1 Wired System Description

This Battery Management System (BMS) design provides an evaluation board for the BQ79718B-Q1 family of devices. The board supports large format lithium-ion battery pack applications and delivers monitoring, protection, balancing, and communications functions.

Each reference design manages up to 18 cells (100Vmax) for Li-ion battery applications. Up to 35 reference design modules stack together for packs up to 560 series cells.

Each system delivers fast cell balancing, diagnostics, and module-to-controller communication. The design also includes independent protection circuitry.

Each design features precision measurement and synchronous communication that enables a main controller to perform State of Charge (SOC) and State of Health (SOH) estimation. Highly accurate cell voltages and fast sampling time for the entire battery pack enable more efficient operation of battery modules and more accurate SOC and SOH calculations. Communication with stacked reference design devices occurs through an isolated daisy-chain differential bus.

Control a single reference design or multiple stacked reference design devices using a PC-hosted GUI. Communication between the PC and the base device occurs through a USB2ANY UART interface. For a stack of reference design devices, communication between all other devices in the stack occurs through the isolated, daisy-chain differential communication bus. The PC GUI enables configuration of the reference design to monitor cells and other analog data channels, control balancing, and monitor fault details.

Table 1-1 Key System Specifications
ITEMDESCRIPTIONTYPUNIT
VBATP_MaxMaximum operating voltage100V
VBATP_MinMinimum operating voltage9V
VVC_RANGEVCn – VCn – 1, where n = 1 to 181 to 5V
VCB_RANGECBn – CBn – 1, where n = 1 to 181 to 5V
TAOperation temperature–40°C to 125°C°C