Introduction - Nokia RH-66 Troubleshooting Manual

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Introduction

The mobile terminal uses a CDMA tri-mode engine (AMPS/800/1900) with a DCT4
baseband consisting of three ASICs:
• Universal Energy Management cost reduction (UEMC)
• Universal Phone Processor (UPP) - UPP8Mv4.2
• 8MB flash memory with 1 MB of RAM memory
The baseband architecture supports a power-saving function called sleep mode. Sleep
mode shuts off the voltage-controlled temperature-compensated crystal oscillator
(VCTCXO), which is used as the system clock source for both the RF and the baseband.
During sleep mode, the system runs from a 32 kHz crystal and all the RF regulators
(VR1A, VR1B, VR2—VR7) are off. The sleep time is determined by network parameters.
Sleep mode is entered when both the Master Control Unit (MCU) and the Digital Signal
Processor (DSP) are in standby mode and the normal VCTCXO clock is switched off. The
mobile terminal is awakened by a timer running from this 32 kHz clock supply. The period
of the sleep/wake up cycle (slotted cycle) is 1.28N seconds, where N= 0, 1, 2, depending
on the slot cycle index.
The mobile terminal supports standard Nokia 2-wire and 3-wire chargers (ACP-x and
LCH-x). However, the 3-wire chargers are treated as 2-wire chargers. The PWM control
signal for controlling the 3-wire charger is ignored. The UEMC and energy management
software control charging.
A BL-6C (1070 mAh) lithium-ion battery is used as the main power source.
Issue 1 03/2005
©2005 Nokia Corporation
2115i/2116/2116i (RH-66)
Baseband Description and Troubleshooting
Company Confidential Page 5