6.1 Charger voltage measurement

When a charger is connected to the mobile device, the device's system will start the charger-recognition procedure by checking the charger voltage with 1 – 2 mA current. Identification is based on measured average voltage and waveform: 4.65 V – 5.20 V is identified as a special charger and 5.5 V - 9.3 V is identified as a standard charger.