diff --git a/src/drivers/boards/nxphlite-v3/nxphlite_init.c b/src/drivers/boards/nxphlite-v3/nxphlite_init.c
index de363053cf..6fd9d752f5 100644
--- a/src/drivers/boards/nxphlite-v3/nxphlite_init.c
+++ b/src/drivers/boards/nxphlite-v3/nxphlite_init.c
@@ -115,7 +115,6 @@ __BEGIN_DECLS
 extern void led_init(void);
 extern void led_on(int led);
 extern void led_off(int led);
-extern bool g_board_usb_connected;
 __END_DECLS
 
 /****************************************************************************
diff --git a/src/drivers/kinetis/adc/adc.cpp b/src/drivers/kinetis/adc/adc.cpp
index a70436dccf..a37c64d1d5 100644
--- a/src/drivers/kinetis/adc/adc.cpp
+++ b/src/drivers/kinetis/adc/adc.cpp
@@ -111,8 +111,6 @@ typedef uint32_t 	adc_chan_t;
 #define rCLM1(adc)  REG(adc, KINETIS_ADC_CLM1_OFFSET) /* ADC minus-side general calibration value register */
 #define rCLM0(adc)  REG(adc, KINETIS_ADC_CLM0_OFFSET) /* ADC minus-side general calibration value register */
 
-bool g_board_usb_connected = false;
-
 class ADC : public device::CDev
 {
 public:
@@ -372,36 +370,33 @@ ADC::update_system_power(hrt_abstime now)
 
 	system_power.voltage5V_v = 0;
 
-#if defined(ADC_5V_RAIL_SENSE) || defined(BOARD_ADC_USB_CONNECTED)
+#if defined(ADC_5V_RAIL_SENSE)
 
 	for (unsigned i = 0; i < _channel_count; i++) {
-#if defined(ADC_5V_RAIL_SENSE)
 
 		if (_samples[i].am_channel == ADC_5V_RAIL_SENSE) {
 			// it is 2:1 scaled
 			system_power.voltage5V_v = _samples[i].am_data * (6.6f / 4096);
 		}
-
-#endif
-#if defined(BOARD_ADC_USB_CONNECTED)
-
-		if (_samples[i].am_channel == BOARD_ADC_USB_CONNECTED) {
-			// > that 50% assum connected
-			system_power.usb_connected = _samples[i].am_data > (4096 / 2);
-		}
-
-#endif
 	}
 
 #endif
 
+
 	/* Note once the board_config.h provides BOARD_ADC_USB_CONNECTED,
 	 * It must provide the true logic GPIO BOARD_ADC_xxxx macros.
 	 */
 	// these are not ADC related, but it is convenient to
 	// publish these to the same topic
 
-	g_board_usb_connected = system_power.usb_connected;
+	system_power.usb_connected = BOARD_ADC_USB_CONNECTED;
+	/* If provided used the Valid signal from HW*/
+#if defined(BOARD_ADC_USB_VALID)
+	system_power.usb_vaild = BOARD_ADC_USB_VALID;
+#else
+	/* If not provided then use connected */
+	system_power.usb_vaild  = system_power.usb_connected;
+#endif
 
 	system_power.brick_valid   = BOARD_ADC_BRICK_VALID;
 	system_power.servo_valid   = BOARD_ADC_SERVO_VALID;