LED status/color Description
OFF No USB connection
Table 7. COM LED
LED status/color Description
Green The last communication with the target has been successful
Orange The last communication with the target has failed
Red
STLINK-V3PWR is in the idle state (the USB enumeration with the PC is finished and the
STLINK-V3PWR is waiting for an application to connect).
Blinking red
The first enumeration with the PC is taking place. If an STLinkUpgrade application is running,
the firmware is being programmed.
Blinking green/red Data is being exchanged between the target and the PC
OFF Fatal error: USB removal cable is required
Table 8. OUT LED
LED status/color Description
Green OUT is turned ON and no power measurement is ongoing.
Slow blinking green OUT is turned ON and the current measurement is ongoing.
Fast blinking green OUT is turned ON and trigger IN is armed.
Orange Calibration ongoing
Red
Overcurrent detected on OUT (refer to Section 7.2.4 Overcurrent and short circuit
management). OUT and AUX automatically turned OFF
Slow blinking red Overheating protection. OUT and AUX automatically turned OFF
Fast blinking red Fatal error during initialization
Slow blinking green/red Short overcurrent detected on OUT (not fatal, blinking during 2 s)
OFF OUT is turned OFF.
Table 9. V
AUX LED
LED color Description
Red Overcurrent detected (refer to Section 7.3. OUT and AUX automatically turned OFF
Green AUX is ON.
OFF AUX is OFF.
UM3097
LEDs management
UM3097 - Rev 1
page 17/30
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