LG KF690 Service Manual page 19

3. TECHNICAL BRIEF
■ Integrated handset-level housekeeping functions reduces external parts count, size, cost
- Analog multiplexer selects from 8 internal and up to 18 external inputs
- Multiplexer output's offset and gain are adjusted, increasing the effective ADC resolution
- Adjusted multiplexer output is buffered and routed to an ESM device ADC
- Dual oscillators - 32.768 kHz off-chip crystal and on-chip RC assures ESM device sleep clock
- Crystal oscillator detector and automated switch-over upon lost oscillation
- Real time clock for tracking time and generating associated alarms
- On-chip adjustments minimize crystal oscillator frequency errors
- Circuits control TCXO warm-up and synchronize, deglitch, and buffer the TCXO signal
- TCXO buffer control for optimal QPH/catnap timing
- Three-stage over-temperature protection (smart thermal control)
■ Integrated handset-level user interfaces
- Four programmable current sinks recommended as keypad backlight, LCD backlight, camera
flash, and general-purpose drivers
- Vibration motor driver programmable from 1.2 to 3.1V in 100 mV increments
- Speaker driver with programmable gain, turn-on time, and muting; differential operation (drives
external 8 Ω speakers with volume controlled 500 mW)
■ IC-level interfaces
- ESM6270 device-compatible 3-line SBI for efficient initialization, status, and control
- Supports the ESM6270 device's interrupt processing with an internal interrupt manager
- Many functions monitored and reported through real-time and interrupt status signals
- Dedicated circuits for controlled power-on sequencing, including the ESM6270 device's reset
signal
- Several events continuously monitored for triggering power-on/power-off sequences
- Supports and orchestrates soft resets
- USB-OTG transceiver for full-speed (12 Mb/s) and low speed (1.5 Mb/s) interfacing of the
ESM6270
- device to computers as a USB peripheral, or connecting the ESM6270 device to other peripherals
- RUIM level translators enable ESM6270 device interfacing with external modules
■ Twelve multi-purpose pins that can be configured as digital or analog I/Os, bi-directional I/Os, or
current sinks. Default functions support the RUIM level translators, power-on circuits, analog
multiplexer inputs, an LED driver, and a reference voltage buffer.
■ Highly integrated functionality in a small package - 84-pin BCCS with a large center slug for
electrical ground, mechanical stability, and thermal relief
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