Gr64002 Hw-Detection; Figure 9: Gr64002 Power State Detection - Wavecom Gx64 Application Note

3.6.2

GR64002 HW-detection

In GR64002, where VREF is an input to the Wireless CPU the HW-detection of the
power state must use SIMDET instead of VREF.
The SIMDET-signal is pulled up inside the Wireless CPU to its internal supply voltage
(1.8V). It does not go through the built-in level translators as the other logic signals.
This can be used to determine the state of the Wireless CPU. It also means that the
SIMDET-signal cannot be used to determine whether a physical SIM is inserted
properly into the external SIM-holder.

Figure 9: GR64002 Power State detection

As can be seen in Figure 9, the SIMDET-signal can be used to determine the power
state of the GR64002. Instead of routing the signal to the physical detection pin of
the SIM-holder, it is routed to a detection circuitry that translates the level from 1.8V
to whatever logic level the Application is using. The "Reference Voltage, R1 and R2
must be selected so that the transition levels correspond to the levels indicated in
Table 4 below.
The pull up resistor that is built in to the Wireless CPU R
application must ensure that it does not a load that affects the signal.
recommended to keep the load (R
Gx64 APPLICATION NOTE
Power Management
Page: 20/30
) ≥2 Mohm.
L
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is typically 200k. The
PU
It is