After Sales
Technical Documentation
RAE/RAK–1N
Baseband
Page 2–21
Original, 08/96
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 Signal description From
VL1 Power supply voltage for CTRLU block PWRU
VREF Reference voltage for MCU AD–converter PWRU
VFF Programming voltage for flash memory B2B Conn
VBATDET Battery voltage detection PWRU
VC Charger voltage monitoring PWRU
RESETX Reset signal for MCU ASIC
NMI Non–maskable interrupt request ASIC
MCUCLK Main clock for MCU ASIC
IRQX Interrupt request ASIC
PCMCDO Audio codec control data receiving AUDIO
TRF RF–module temperature detection RF
LID Cover open/closed detection (HOOK A/D input). B2B Conn
RBUSRXD RBUS receive data B2B Conn
TBAT Battery temperature monitoring Battery
Conn
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