Ctrlu; Introduction; Technical Specifications - Nokia 9000i Service Manual

After Sales
Technical Documentation
Failed operation:
4. ASIC resets MCU and DSP after about 0.5 s failure
5. PSL+ switches power off about 5 s after the previous XPWROFF pulse

CTRLU

Introduction

The Control block contains a microcomputer unit (MCU) and five memory
circuits (2xFLASH, 2xSRAM and EEPROM), a 20–bit address bus and a
16–bit data bus. Physically the CTRLU resides entirely on MCM1.
Main Features of the CTRLU Block
MCU functions:
– system control
– communication control
– user interface functions
– GSM data encoding and decoding
– authentication
– RF monitoring
– power up/down control
– accessory monitoring
– battery monitoring and charging control
– self–test and production testing
– flash loading

Technical specifications

Table 23. External Signals and Connections, Inputs
Signal Name
VL1 Power supply voltage for CTRLU block
VREF Reference voltage for MCU AD–converter
VFF Programming voltage for flash memory
VBATDET Battery voltage detection
VC Charger voltage monitoring
RESETX Reset signal for MCU
NMI Non–maskable interrupt request
MCUCLK Main clock for MCU
IRQX Interrupt request
PCMCDO Audio codec control data receiving
TRF RF–module temperature detection
LID Cover open/closed detection (HOOK A/D input).
RBUSRXD RBUS receive data
TBAT Battery temperature monitoring
Original, 08/96
Signal description
RAE/RAK–1N
Baseband
From
PWRU
PWRU
B2B Conn
PWRU
PWRU
ASIC
ASIC
ASIC
ASIC
AUDIO
RF
B2B Conn
B2B Conn
Battery
Conn
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