TP5400 Lithium Battery Charging/Discharging + MCU One-Button Power On/Off Module

Function Introduction:


The TP5400 lithium battery charging and discharging module can charge 18650 batteries to a full charge at 4.2V.


Battery power is cut off when USB is plugged in; switching to USB power allows charging to continue.


Battery over-discharge protection cuts off power when the battery voltage is too low, triggering the TP5400 low-voltage protection.


MCU one-button power on/off function. Jumper mode switching: Normally open mode: Pressing the power button starts the circuit; flashing the MCU will not restart it, only the Reset button can shut it down. Power on/off mode: After startup, a high-level output from the MCU control pin can shut down the circuit.


Physical Reset button can force the circuit to shut down, preventing MCU crashes.












MCU sample code (ESP32 S3):

#define OFFP_IN 47
#define BUILDINLED_PIN 48
#define ACTION_PIN 13

void setup() {
pinMode(ACTION_PIN, INPUT);
pinMode(OFFP_IN, OUTPUT);
pinMode(BUILDINLED_PIN, OUTPUT);
digitalWrite(OFFP_IN, HIGH);
digitalWrite(BUILDINLED_PIN, HIGH);
}

void loop() {

static unsigned long timer = millis();

if (digitalRead(ACTION_PIN) == LOW) {
if (millis() - timer >= 4000)
{
digitalWrite(OFFP_IN, LOW);
digitalWrite(BUILDINLED_PIN, HIGH);
} else {
digitalWrite(BUILDINLED_PIN, LOW);
}
} else {
timer = millis();
digitalWrite(BUILDINLED_PIN, HIGH);
}
}