LTE Module Series

SC20 Charging User Guide

SC20_Charging_User_Guide Confidential / Released 9 / 14

static const struct qpnp_vadc_map_pt adcmap_btm_threshold[] = {

{XXX, YYY}, //The former is the temperature value, and the latter is the voltage

}

The table is customized, it needs hardware engineers to get values from battery vendors and fill in.

 High Temperature Shutdown

High temperature protection has been enabled on SC20, when the battery temperature is above 68

degrees, it will automatically shut down.

High temperature shutdown related files and codes are presented as follows:

1. android/frameworks/base/services/core/java/com/android/server/BatteryService.java: for executing

shutdown action.

private void shutdownIfOverTempLocked() {

//Shut down gracefully if temperature is too high (>68°C by default)

//Wait until the system has booted before attempting to display the shutdown dialog.

if (mBatteryProps.batteryTemperature > mShutdownBatteryTemperature) {

mHandler.post(new Runnable() {

@Override

public void run() {

if (ActivityManagerNative.isSystemReady()) {

Slog.e(TAG, "silent_reboot shutdownIfOverTempLocked");

Intent intent = new Intent(Intent.ACTION_REQUEST_SHUTDOWN);

intent.putExtra(Intent.EXTRA_KEY_CONFIRM, false);

intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

mContext.startActivityAsUser(intent, UserHandle.CURRENT);

}

});

}

2. android/frameworks/base/core/res/res/values/config.xml: set the temperature that triggers shutdown.

If module shuts down immediately after being turned on, customer should first make sure that the battery

has power, then check whether it is caused by high temperature or not.

Quectel SC20 Charging User Guide

Other manuals for Quectel SC20