Sony Ericsson W995 Troubleshooting Manual page 90

FUNCTIONAL OVERVIEW Technical Description
SEMC Troubleshooting Manual
W995
Baseband Part Functional Blocks of the Analog Baseband Controller:
Analog Baseband Controller N2000 (Vera)
This component is not replaceable on SL 4 because Baseband calibration is required. The
analog baseband controller is the main power management circuit. It has converters and
regulators that generate a number of supply voltages, each optimized for its load.
The analog baseband controller is a mixed digital and analog device that supports the
following circuitry:
• Power management circuitry
• Voltage regulation circuitry
• Eight Low Dropout (LDO) regulators and low power regulator
• 600 mA integrated Buck regulator
• Boost step-up DC/DC converter for White Light Emitting Diode (WLED) driving
• Battery charging and communication circuitry
• Battery fuel gauging circuitry
• Analog-to-Digital Converter (ADC)
• Digital-to-Analog Converter (DAC)
• SIM interface
• Six programmable LED drivers
• Accurate band gap reference
• Vibrator driver
• Real Time Clock (RTC)
• 8-byte One-Time Programmable (OTP) memory
• Pulse Code Modulation (PCM) voice coder/decoder
• PCM audio coder/decoder
• Microphone interface
• Stereo line input
• Earphone driver
• Earpiece driver
• 8- speaker driver / Stereo line output
The analog baseband controller is controlled by an I2C™ interface. It also comprises the
main power management circuits, equipped with a number of converters and regulators
for generating the required supply voltages.
The analog baseband controller supports the following features:
• Lithium battery
• Full audio CODEC functionality
• Supports stereo audio sampling rates of 8/16 kHz voice coding/decoding and 44.1/48
kHz for high quality audio recording/playback (for example MIDI and MP3 applications)
• Double CODEC I2S/PCM interfaces
• Flexible microphone interface
• Integrated headphone amplifiers
• Integrated earpiece amplifiers
• Integrated speaker amplifier
• Integrated flexible audio mixing functionality
• Boost driver capable of driving up to four WLEDs in series, supplying 50 mA
• Designed to meet power management demands of GSM and WCDMA
• Automated power management ADC to relieve CPU
• Battery identification and communication
• Single-terminal charger and accessory power interface for compact connector design
• Integrated USB charging
• OTP memory
• Integrated hardware fuel gauge to accurately monitor battery capacity
• Reduced number of external components as a result of integrated programmable LED
and vibrator drivers
• 32 kHz real time clock with alarm wake up capability
• Designed to support two host controllers.
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