boards/nucleo-l496zg: vbat doc improvement

Co-authored-by: Marian Buschsieweke <maribu@users.noreply.github.com>
RIOT-OS · Nov 21, 2022 · 2f36a18 · 2f36a18
1 parent d557f12
commit 2f36a18
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/boards/nucleo-l496zg/include/periph_conf.h b/boards/nucleo-l496zg/include/periph_conf.h
@@ -185,7 +185,10 @@ static const adc_conf_t adc_config[] = {
     { .pin = GPIO_PIN(PORT_C, 1), .dev = 0, .chan =  2 }, /* ADC123_IN2  */
     { .pin = GPIO_PIN(PORT_C, 4), .dev = 0, .chan = 13 }, /* ADC12_IN13  */
     { .pin = GPIO_PIN(PORT_C, 5), .dev = 0, .chan = 14 }, /* ADC12_IN14  */
-    { .pin = GPIO_UNDEF, .dev = 0, .chan = 18 }, /* VBAT */
+    /* VBAT is connected ADC1_IN18 or ADC3_IN18 and a voltage divider
+     * is used, so that only 1/3 of the actual VBAT is measured. This
+     * allows for a supply voltage higher than the reference voltage. */
+    { .pin = GPIO_UNDEF, .dev = 0, .chan = 18 },
 };
 
 /**