SWRU640 March   2026

 

  1.   1
  2.   Description
  3.   Get Started
  4.   Features
  5.   Applications
  6.   6
  7. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
      1. 1.4.1 CC2662R-Q1
      2. 1.4.2 BQ79718B-Q1
      3. 1.4.3 TPS3436-Q1
      4. 1.4.4 TPS715-Q1
      5. 1.4.5 TXU0204-Q1
      6. 1.4.6 LM5168-Q1
  8. 2Hardware
    1. 2.1 Power Requirements
      1. 2.1.1 Powering with Batteries and Wiring Harness
      2. 2.1.2 Powering with Source Meter/External Supply and Using the Resistor Ladder
    2. 2.2 Temperature Range
    3. 2.3 Programming, Debug, and Control
      1. 2.3.1 Using a Generic XDS110 Debug Probe, Including a Separate LaunchPad
    4. 2.4 Interfaces
      1. 2.4.1 Debug Interface Connector
      2. 2.4.2 BQ Daisy Chain Interface
    5. 2.5 Jumpers
    6. 2.6 General Features
      1. 2.6.1 BQ DCDC Converter (LM5168-Q1)
      2. 2.6.2 BQ Voltage References
      3. 2.6.3 BQ Resistor Ladder
      4. 2.6.4 BQ Busbar
      5. 2.6.5 CC2662R-Q1 LDO
      6. 2.6.6 CC2662R-Q1 Watchdog
      7. 2.6.7 BQ to Wireless MCU Level Shifter
      8. 2.6.8 Status LEDs
    7. 2.7 Advanced Use of the EVM Hardware
      1. 2.7.1 Base or Stack
      2. 2.7.2 Ring Architecture
      3. 2.7.3 Busbar Position
      4. 2.7.4 Radiated/Conducted Testing
      5. 2.7.5 Communication Isolation
  9. 3Software
    1. 3.1 Software Development
  10. 4Hardware Design Files
    1. 4.1 Schematics
    2. 4.2 PCB Layouts
    3. 4.3 Bill of Materials (BOM)
  11. 5Compliance Information
    1. 5.1 CE Compliance
    2. 5.2 REACH Compliance
    3. 5.3 Waste Electrical and Electronic Equipment (WEEE) Compliance
  12. 6Additional Information
    1. 6.1 Known Hardware or Software Issues
    2. 6.2 Trademarks
    3. 6.3 Terminology
  13. 7References

2.7.5 Communication Isolation

Capacitor Only Isolation: For capacitor only isolation for the VIF communication block, the isolation capacitors (C71, C76, C77 and C82) in the following figure, must all be populated with 2.2nF capacitors. In addition, the series resistors (R122, R129, R133, and R140) in Figure 2-25, must all be populated with 0Ω resistors. These 0Ω resistors will bypass the choke footprint and must be used when the choke is not being used. The L2 and L3, footprints for the choke, should not be populated.

CC2662RQ1-CSU-EVM Cap Only Isolation Figure 2-25 Cap Only Isolation

Capacitor and Choke Isolation (Default Configuration): Capacitor and choke isolation for the VIF communication block is configured by default. In this configuration, the isolation capacitors (C71, C76, C77 and C82) in the following figure, must all be populated with 2.2nF capacitors. The choke will be populated at L2 and L3. The series resistors (R122, R129, R133, and R140) must not be populated so the choke is not bypassed.

CC2662RQ1-CSU-EVM Cap and Choke Isolation Figure 2-26 Cap and Choke Isolation

Transformer Isolation: For transformer isolation for the VIF communication block, the isolation capacitors (C71, C76, C77 and C82) must not be populated. In addition, the series resistors (R122, R129, R133, and R140) must all be populated with 0Ω resistors. Finally, the transformer will be populated at T1 and T2, pictured in Figure 2-25. These 0Ω resistors will bypass the choke footprint and must be used when the choke is not being used. The L2 and L3 footprints will be left unpopulated.

Below are some transformers recommended for communication isolation that have a minimum recommended inductance of 300μH:

Table 2-7 Recommended Transformers
PART NUMBER SUPPLIER INDUCTANCE (OCL) μH HEIGHT (mm)
SM9152AL Bourns 300-1000 4.95
ALTWR-C18TF Sunlord 350 3.50
XFBMC29-BA09-E XFMRS 350 5.00

Be aware that not all transformers have the same pinout. This CSU is designed so that pins 2 and 5 of the transformer are the center-taps of the transformer. However, not all transformers follow this same layout. Review the pinout of the transformers before considering implementation.