The nPM Fuel Gauge Board has three LEDs for visualizing the status of the board.
- LD1 lights up when the SHDN pin on the temperature sensor (U7) becomes active low, signaling a shutdown warning caused by a high circuit temperature.
- LD2 lights up when the ALERT pin on the current monitor (U2) becomes active low, indicating a warning for current levels outside the specified range.
- LD3 lights up when VBUS_nPMC is supplied from the connected Evaluation Kit (EK), showing the power status of the system.
Figure 1. LEDs on the nPM Fuel Gauge Board
| Part | Function | Color | Description |
|---|---|---|---|
| LD1 | SHDN (active low) | Red | Temperature shutdown warning |
| LD2 | ALERT (active low) | Red | High current alert |
| LD3 | PWR | Green | System power status |