LG KU580 Service Manual - Page 58

3. Technical Brief 3.4 GPADC(General Purpose ADC) and AUTOADC2 The GPADC consists of a 14 input MUX and an 8-bit ADC. The analog input signal is selected with the MUX and converted in the ADC. The GPADC has a built in controller, AUTOADC2, which is able to operate in the background without software intervention. The AUTOADC2 periodically measures the battery voltage or current. (Fig.2-41) shows the schematic of GPADC part. The GPADC channel spec is as following (Table 2-4-1). Fig 3-4-1. Schematic of GPADC and AUTOADC2 Fig 3-4-2. GPADC and AUTOADC2 Block diagram ADC 6 channels Resource GPA0 GPA2 GPA3 GPA4 GPA6 GPA7 Name RTEMP VLOOP WPOWERSENSE WRFLOOP GPA6 VBACKUP Description Radio temperature sense Loop voltage sense Reference voltage for PAM Lock inform Headset detect Backup battery Table 3-4-1. GPADC channel spec Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes - 59 - LGE Internal Use Only