User Guide

PAMS
Technical Documentation
NSE–8/9
System Module
Page 2– 58
Issue 1 07/99
Battery removal
SIMCardDetX input on MAD is a threshold detector with a nominal input
switching level 0.85xVbb for a rising edge and 0.55xVbb for a falling edge.
The battery removal detection is used as a trigger to power down the SIM
card before the power is lost. V109a pulls SIMCardDetX high, telling the
MAD to power down RF, SIM and Baseband, which takes about 2ms. Vbb
is maintained for about 4ms by the energy stored in the switcher output
capacitors, thus providing a sufficient delay between battery removal
detection and supply power off.
0.550.05 Vbb
0.850.05 Vbb
Vbb
GND
S
IGOUT
SIMCARDDETX
Figure 15. Sim Card DetX detection levels
If the battery pack is disconnect during the sleep mode, the CCONT pulls
the SIM interface lines low as there is no time to wake up the MCU.
Memories
The program code resides in an external FLASH program memory.
The DSP operates entirely from the internal MAD2PR1 memory, the DSP
code is down loaded from the external Flash via the (API ram) interface in
MAD2PR1. The MCU operates from the external Flash memory as well as
from the external RAM memory. A serial EEPROM is used for storing the
system and tuning parameters, user settings and selections etc.