SDAA080 September   2025 TPS2HCS08-Q1 , TPS2HCS10-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2High Side Switch Current Sense and Open Load Detection
    1. 2.1 Current Sense in High-side Switches
    2. 2.2 Open-Load Detection in High-side Switches
  6. 3Smart eFuse Current Sense and Open Load Detection
    1. 3.1 Open Load Detection in eFuses
    2. 3.2 Open-Load Current Sense Scaling
    3. 3.3 ADC Input Scaling
    4. 3.4 OL_ON and ADC Input Scaling Programming Procedure
  7. 4Normal vs. Open-Load Scaling Test Results
  8. 5Design Considerations
  9. 6Summary
  10. 7References

3.4 OL_ON and ADC Input Scaling Programming Procedure

OL_ON mode can be enabled by setting the relevant OL_ON_EN_CHx bit high in the respective CHx_CONFIG register. For the device to accept the command and enter OL_ON mode, the output current must be below the IENTRY_OL_ON threshold. If the output current is not, then the device does not enter OL_ON mode and OL_ON_EN_CHx stays low. If the output current is below IENTRY_OL_ON and OL_ON_EN_CHx is set high, then KSNS decreases and FET ON resistance increases as specified above until OL_ON_EN_CHx is set low or the output current exceeds IEXIT_OL_ON.

To enable the 8x ADC input scaling, set the ISNS_SCALE_CHx bit and the respective CHx_CONFIG register high. There is no other requirement to enable ADC input scaling.

During OL_ON mode and ADC input scaling operation, TI recommends that the MCU periodically check OL_ON_EN_CHx to make sure the device is still in OL_ON mode. When reading the respective channel current sense, the ISNS_SCALE_EFF_CHx bit is included in the ADC_RESULT_CHx_I current sense result register to notify the MCU of what multiplier to use to read the current sense result. This bit directly shows whether a 1x or 8x ADC scaling factor is used.

OL_ON Enable Flowchart Figure 3-1 OL_ON Enable Flowchart