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--- projects:electronics:nrf52:nrf52840_notes [2025/08/30 03:03] – created Andrew Yong
+++ projects:electronics:nrf52:nrf52840_notes [2025/08/30 03:16] (current) – LDO notes and GPIO VDD notes Andrew Yong
@@ Line 5: / Line 5: @@
 ==== Motivation ====
-  * Simplify BoM and layout by using the nrf52840 VDDH -> VDD LDO
+  * Simplify BoM and layout by using the nrf52840 VDDH -> VDD LDO instead of an external 3.3 V LDO
 ==== Limitations ====
@@ Line 16: / Line 16: @@
   * VDD must not be connected to VDDH or any power supply at reset
   * Adafruit nRF52 Bootloader -> board.h -> ''#define UICR_REGOUT0_VALUE UICR_REGOUT0_VOUT_3V3'' ([[https://github.com/search?q=repo%3Aadafruit%2FAdafruit_nRF52_Bootloader+%22%23define+UICR_REGOUT0_VALUE+UICR_REGOUT0_VOUT_3V3%22&type=code|Adafruit nRF52 Bootloader GitHub search]])
+    *  If not defined, default REGOUT0 output = VDD = 1.8 V and GPIO output high = VDD = 1.8 V
 ==== Notes ====

ndoo.sg