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FUNCTIONAL OVERVIEW
Technical Description
SEMC Troubleshooting Manual
W890
Hardware Overview
Functional Blocks of the Analog Baseband Controller.
The W890 is using the U360 2.0 platform provided by Ericsson Mobile Platform (EMP)
Baseband Part
Analog Baseband Controller
Power Management
N2000 (Vera)
This component is not replaceable on SL 4 because Baseband calibration is required.
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)
• SIM interface
• Six programmable LED drivers
• Accurate band gap reference
• Vibrator driver
• Real Time Clock (RTC)
• Eight-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-Ω 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.
1217-3942 rev. 1
81
(119)
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Troubleshooting
