2-6CHAPTER 2 THEORY OF OPERATIONFigure 2-3. Block Diagram.LCDDRIVERU7EEPROMU6INTEGRATORU5B COMPARATORU3AELECTRONICSWITCHU4B,U4C,U4D, U4EDISPLAYDS1FULLBRIDGELOADCELLFULL BRIDGE WEIGHT A/D CONVERTERRAMPQ2TEMPERATURE A/D CONVERTERINTEGRATORU5A COMPARATORU3BELECTRONICSWITCHU4A, U4FMICROPROCESSORU1HALF BRIDGE EMULATIONHALFBRIDGELOADCELL9 VOLT BATTERYOREXTERNALAC ADAPTERVOLTAGEREGULATORVR1ON/OFFTARE/MODESWITCHESSW1, SW2,Q5, Q6LOWVOLTAGEDETECTORQ4, Q7LOWBATTERY SIGNAL10MHzCLOCK+5 VDCOUTPUTTEMPERTURESENSORRESISTORNETWORKR45, R46