diff --git a/firmware/libboard/simtrace/include/board.h b/firmware/libboard/simtrace/include/board.h
index f8326d20..a0bc37ea 100644
--- a/firmware/libboard/simtrace/include/board.h
+++ b/firmware/libboard/simtrace/include/board.h
@@ -105,6 +105,14 @@
 /* ISO7816-communication related pins */
 #define PINS_ISO7816            PIN_SIM_IO,  PIN_SIM_CLK,  PIN_ISO7816_RSTMC // SIM_PWEN_PIN, PIN_SIM_IO2, PIN_SIM_CLK2
 
+/** card emulation configuration */
+/* Disable power converter 4.5-6V to 3.3V (active high) */
+#define PIN_SIM_PWEN_CARDEMU   {SIM_PWEN, PIOA, ID_PIOA, PIO_OUTPUT_0, PIO_DEFAULT}
+/* Disable power switch to forward VCC_PHONE to VCC_SIM (active high) */
+#define PIN_VCC_FWD_CARDEMU    {VCC_FWD, PIOA, ID_PIOA, PIO_OUTPUT_0, PIO_DEFAULT}
+/* Disable power to SIM */
+#define PINS_PWR_CARDEMU        PIN_SIM_PWEN_CARDEMU, PIN_VCC_FWD_CARDEMU
+
 /** External SPI flash interface   **/
 /* SPI MISO pin definition */
 #define PIN_SPI_MISO  {PIO_PA12A_MISO, PIOA, PIOA, PIO_PERIPH_A, PIO_PULLUP}
diff --git a/firmware/libcommon/source/mode_cardemu.c b/firmware/libcommon/source/mode_cardemu.c
index 4a6a3bfd..d5405c2e 100644
--- a/firmware/libcommon/source/mode_cardemu.c
+++ b/firmware/libcommon/source/mode_cardemu.c
@@ -508,12 +508,20 @@ void mode_cardemu_init(void)
 
 	TRACE_ENTRY();
 
+#ifdef PINS_PWR_CARDEMU
+	// enable power on required peripherals, else disable
+	Pin pins_pwr_cardemu[] = { PINS_PWR_CARDEMU };
+	PIO_Configure(pins_pwr_cardemu, PIO_LISTSIZE(pins_pwr_cardemu));
+#endif /* PINS_PWR_CARDEMU */
 #ifdef PINS_CARDSIM
 	PIO_Configure(pins_cardsim, PIO_LISTSIZE(pins_cardsim));
 #endif
+	// ADC channel 6 and 7 are used to measure VCC (else they are grounded)
+	ADC->ADC_CHER |= ADC_CHER_CH6 | ADC_CHER_CH7; // enable the ADC channels to put them in high impedance (else they leak current)
 #ifdef DETECT_VCC_BY_ADC
-	card_vcc_adc_init();
+	card_vcc_adc_init(); // configure the ADC to measure VCC
 #endif /* DETECT_VCC_BY_ADC */
+	// TODO pull SIMtrace board SIM lines low, else they can leak current back to VCC
 
 	INIT_LLIST_HEAD(&cardem_inst[0].usb_out_queue);
 	rbuf_reset(&cardem_inst[0].rb);