Samsung SCH-210 service manual.pdf - Free

Circuit DescriptionCURRENT DETECTION CIRCUIT : R5, R6,R11, R12, HICBattery charging current is changed voltagethrough R5, R6, R11, R12. This voltage inputedu-COM to 16 times amplifiered through HIC.BATTERY TEMPERATURE DETECTIONCIRCUIT : HIC, TH1Battery temperature detection determinedtemperature by ues of thermistor registor variationof THI by HIC.VOLTAGE DETECTION CIRCUIT : HICu-COM A/D through HIC pin 12, 13 detectedvoltage.CURRENT LIMIT CIRCUIT : HICWhen soft-change, current detection circuitlimited current flow to battery, reference voltagemore than detected current, detected current andHIC internal reference voltage.6-5 Hands-Free Kit6-5-1 Charging CircuitA constant voltage is used for the hands-free kit.This circuit converts DC 12V input current to 8.4VDC to charge the battery. When the battery is fullycharged, the charge current drops and the circuitoperates as a constant voltage.6-5-3 Speaker circuitThis circuit eliminates HHP noise, and controlsthe sound quality and speaker volume usinganalog C-mos IC which checks the speaker signalup to 8 steps. 5W audio amplifier amplifies thespeaker signal.6-5-2 u-ProcessorMicro processor controls charging power andcharging current to protect the phone. It alsoallows to communicate with a HHP, and toconvert from hands-free mode to private mode,and vice verse. It adjusts speaker volume at 8 stepsand attenuates echo and noise occurred duringconversation.6-5-4 Microphone CircuitThis circuit separates ground to eliminate thenoise occurring from the HHP antenna andmicrophone. u-processor controls this circuit toattenuate echo which may occur in Land side.6-8 Samsung Electronics - Contents may change without notice.