ESP32-S3 GPIO45
Everything you need to use this pin correctly: status, alternate functions, boot-time cautions and working code.
| Status | Usable |
|---|---|
| Alternate functions | Strapping |
| Chip | ESP32-S3 pinout |
Watch out：
- Strapping pin: its level is latched at power-up to configure boot behaviour. Do not attach anything that changes its reset state.
Practical notes
Strapping pin. Together with GPIO0, GPIO46 and GPIO3 it selects the boot mode and VDD_SPI voltage. The level is latched at power-up, after which it works as normal GPIO — but your external resistors must produce the correct state at reset.
Sample code
// Arduino
const int PIN = 45;
void setup() {
pinMode(PIN, OUTPUT);
}
void loop() {
digitalWrite(PIN, HIGH);
delay(500);
digitalWrite(PIN, LOW);
delay(500);
}
Data verified：2026-10-20 · Cross-checked against Espressif documentation. Always confirm against the official datasheet before finalizing a design. Official docs →