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SL55
Company Confidential © Copyright Siemens AG
06/03
The EGOLD+ contains a 16-bit micro-controller (µC part), a GSM analog Interface
(EGAIM), a DSP computing core (DSP part) and an interface for application-specific
switch-functions.
The µC part consists of the following:
· Micro-controller
· System interfaces for internal and external peripheries
· On-chip peripheries and memory
The Controller Firmware carries out the following functions:
· Control of the Man Machine Interface (keypad, LCD, sensing element, control of the
illumination,...)
· GSM Layer 1,2,3 /GPRS
· Control of radio part (synthesizer, AGC, AFC, Transmitter, Receiver...),
· Control of base band processing (EGAIM)
· Central operating system functions (general functions, chip select logic, HW driver,
control of mobile phones and accessories...).
The EGAIM part contains the interface between the digital and the analogue signal
processing:
· 2 Sigma Delta A/D converters for RX signal, and for the necessary signals for the
charge control and temperature measurement. For this, the converter inputs are
switched over to the various signals via the multiplexer.
· 2 D/A converters for the GMSK-modulated TX signal,
· 1 D/A converter for the Power Ramping Signal,
· 1 Sigma Delta A/D and D/A converter for the linguistic signal.
Blockdiagram EGAIM inside the EGOLD
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