Introduction - Nokia 6255 Description And Troubleshooting

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Introduction

The 6255/6255i/6256/6256i baseband module is a tri-mode, Code Division Multiple
Access (CDMA), dual-band engine and is based on the DCT4.5 standard. The baseband
engine includes two major Application Specific Integrated Circuits (ASICs):
• D2200 — Universal Energy Management Enhanced Integrated Circuit (UEME IC),
which includes the audio circuits, charge control, and voltage regulators
• D2800 — Main phone processor, which includes system logic for CDMA, two
Digital Signal Processors (DSPs), the Main Control Unit (MCU), and the memory
The BL-6C Li-ion battery is used as the main power source and has a nominal capacity of
1070 mA/h.
Issue 2 05/2005
©2005 Nokia Corporation
6255/6255i6256/6256i (RM-19)
Baseband Description and Troubleshooting
Company Confidential Page 5