Only For Training And Service Purposes - LG KC780 Service Manual

3. TECHNICAL BRIEF
• Support for Trickle and Indicator LED.
Charger
The charger unit controls the charging of LiON batteries. It generates the power-on reset after battery
insertion or
charger connection.
• Constant current charging (active trickle charge mode)
• Pre-charge for deep discharged batteries (trickle charge mode)
• Charging through USB
• Charging up to 10 V charger voltage
• Withstands charger voltages up to 15 V
• Switched charging (charge current/voltage adjusted in the charger unit)
• Charger detection
• Battery over-voltage detection, battery voltage monitoring
• Power-on reset
• Software controlled charging
• Common Charge and Accessory Pin.
Motor Driver
• Single ended linear controlled 140 mA motor driver for 2.8 V vibrator
• Optional PWM controlled, internal pass device used as a switch.
Audio Amplifier
• Battery driven 400 mW differential audio amplifier for driving 8 ohm loudspeaker
• Three gain stages including overdrive for ringing tones
• >90 dB PSRR (4 kHz).
Interfaces
• I2C control interface for device configuration
• PMU is configured in software via registers
• Power-on reset generation
• Interrupt (event) line to indicate status change.
Control Unit
• Pulse width modulated (PWM) LED driver for dimmed light
• Device ON/OFF switching
• Over-temperature warning
• System start-up state machine
• Under-voltage shut down with defined system behavior
• Charger detection
• Battery insertion/removal detection
• Independent LDO switch on
• Software and hardware programmable voltages
• System watchdog timer with on-chip oscillator.
LGE Internal Use Only - 34 - Copyright © 2008 LG Electronics. Inc. All right reserved.

Only for training and service purposes