Confidential
MANUAL
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Document number
Revision
7/198 17-LXE 108 566 Uen
A
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2.3.5.5 SIMDET
This signal is used by the application to indicate whether an external SIM-card is present. Low level indicates SIM-
card present. A high level or high Z indicates SIM-card not available.
This signal is pulled up to VREF inside the module
Figure 8: SIMDET timing
Limits
Parameter
Symbol
Conditions
Min.
Nom.
Max.
Unit
Low level input
voltage
V
IL
0.3*VREF
Volt
High level input
voltage
V
IH
0.7*VREF
Volt
Input resistance
inside module
R
IN
Pulled up to
VREF
20 34 100
k
Ω
Rise and fall time
t
r
/ t
f
400
μ
s
Hold time
t
hold
High or Low
250
ms
Table 18: SIMDET Electrical Parameters
