SLVAFE5 September   2022 TPS92610-Q1 , TPS92611-Q1 , TPS92612-Q1 , TPS92613-Q1


  1.   Abstract
  2.   Trademarks
  3. 1Introduction
  4. 2TPS9261x-Q1 Fault Detection and Discrete Fault Detection Introduction
    1. 2.1 Discrete Fault Detection
    2. 2.2 Open Load vs Short-to-Battery Detection
    3. 2.3 Short to Ground vs Overtemperature Detection
    4. 2.4 Fault Detection Logic Summary
  5. 3Discrete Fault Detection Circuit Details
    1. 3.1 Simulation
    2. 3.2 PCB Implementation
    3. 3.3 Test Setup
    4. 3.4 Thermal Testing for Overtemperature Conditions
  6. 4Conclusion
  7. 5References


Vehicle electronic fault detection is an important capability implemented in vehicles today to report what specific fault has occurred in an electronic system. This fault detection allows the vehicle to communicate the detected fault through LED indicators on the cluster, the onboard diagnostics port (OBD), and potentially over a wireless Wi-Fi®, 4GLTE, or 5G connection. Currently, the TPS9261x-Q1 family of devices features built in fault detection for open load (OL), short to ground (SG), short to battery (SB), and overtemperature (OT) faults that can occur on the LED driver output. However; there is only a single generic fault output to signal when any of the previously-listed faults have occurred in the system and therefore no way for the local MCU to distinguish what specific fault has taken place. This application note demonstrates a cost-effective method to implement a discrete fault detection circuit to report what specific fault has occurred on the TPS9261x-Q1 output to a local MCU.