LG KF390, Руководство по обслуживанию

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LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- One for conditioning a second TCXO signal that can be used to run WLAN devices (Bluetooth or 802.11)
even while the MSM device is in its sleep mode
- Internal divide-by-2 circuit allows the option of using a 38.4 MHz source in place of the usual 19.2 MHz
for UMTS applications
- Redundant sleep oscillators - 32.768 kHz off-chip crystal and on-chip RC assures the MSM device’s
sleep clock
- If the real-time clock and sudden momentary power loss features are not supported, the 19.2 MHz TCXO
signal can be used as the SLEEP_CLK source - eliminating the external 32.768 kHz crystal
- Oscillator detector and automated switch-over to on-chip RC if oscillator halts
- On-chip adjustments minimize crystal oscillator frequency errors
- Real time clock for tracking time and generating associated alarms
- Buffered VREF signals are available at the multi-purpose pins
- 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
ߟ speakers with volume controlled 500 mW)
• IC-level interfaces
- MSM device-compatible 3-line SBI for efficient initialization, status, and control
- Supports the MSM 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 MSM 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 MSM
- device to computers as a USB peripheral, or connecting the MSM device to other peripherals
- RUIM level translators enable MSM device interfacing with external modules
• Twelve multi-purpose pins that can be configured as digital or analog I/Os, bidirectional I/Os, or current
sinks. Their intended functions - as reflected in their pin names - are: RUIM/USIM level translators (six
pins), power-on circuits (1 pin), analog multiplexer inputs (two pins), current drivers (two pins), and a
buffered reference voltage output (one pin).
• Highly integrated functionality in a small package - 97-pin CSP with several center ground pins for
electrical ground, mechanical stability, and thermal relief
3. TECHNICAL BRIEF
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