TIDUFD0 August   2025

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
      1. 2.2.1 Wireless Hardware Configurations
      2. 2.2.2 Auxiliary Power Strategy
      3. 2.2.3 Thermistor Multiplexer
      4. 2.2.4 Cell Balancing
    3. 2.3 Highlighted Products
      1. 2.3.1 CC2662R-Q1
      2. 2.3.2 BQ78706
      3. 2.3.3 TMUX1308
      4. 2.3.4 LM5168
      5. 2.3.5 TMP61
  9. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
    2. 3.2 Software Requirements
    3. 3.3 Test Setup
    4. 3.4 Test Results
      1. 3.4.1 Network Performance
        1. 3.4.1.1 Network Initiation
        2. 3.4.1.2 Network Latency
        3. 3.4.1.3 PDR, PS
        4. 3.4.1.4 Low-Power Mode
      2. 3.4.2 Cell Voltage Accuracy
      3. 3.4.3 Temperature Sensing Using TMP61
      4. 3.4.4 Thermistor Multiplexer Timing
      5. 3.4.5 Current Consumption
  10. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
      3. 4.1.3 Layout Prints
    2. 4.2 Tools and Software
    3. 4.3 Documentation Support
    4. 4.4 Support Resources
    5. 4.5 Trademarks
  11. 5About the Author

3.4.5 Current Consumption

Figure 3-7 shows the test setup for current consumption. Two working modes are tested including keep-alive mode and active mode. VSS line of #S1–3 BQ78706 and BAT line of #B0 BQ78706 are selected as a test point for current measurement to test the current consumption of each BQ78706. Also, the input and output current of power rail are tested to show the performance of the power rail. In both modes, the resistor ladder is powered by a DC source which is set to 63V and 150V to simulate the real cell. A 6.5 digit multimeter is used to measure the voltage across the series resistors. The multimeter is configured to slow mode and 10GΩ input resistor to have the best accuracy.

TIDA-010976 Test Setup for Current ConsumptionFigure 3-7 Test Setup for Current Consumption

In active mode, the WM sent a polling command with 168B payload from each WD node. In keep-alive mode, the BA78706 works in shutdown mode to minimize power consumption.

Table 3-7 shows the BMU current consumption test results.

Table 3-7 Current Consumption Test Results
INPUT VOLTAGETEST POINTPOWER RAIL INPUTPOWER RAIL OUTPUT#B0#S1#S2#S3
WORKING MODEAVGAVGAVGAVGAVGAVG
63VdcActive558.6μA2.67mA11.32mA11.47mA11.23mA11.29mA
Keep-alive37.3μA70.7μA32.6μA3.0μA3.0μA3.0μA
150VdcActive274.2μA2.67mA11.35mA11.49mA11.24mA11.32mA
Keep-alive32μA70.6μA32.0μA3.5μA3.3μA3.2μA