Specifications

M80 Hardware Design
M80_HD_V1.0 - 26 -
VOLmax=0.15*VDD_
EXT
SIM1 interface
PIN NAME
PIN
NO.
I/O
DESCRIPTION
DC
CHARACTERISTICS
COMMENT
SIM1_
VDD
56
O
Power supply for SIM
card
The voltage can be
selected by software
automatically. Either
1.8V or 3V.
All signals of SIM
interface should be
protected against ESD
with a TVS diode
array.
Maximum cable
length is 200mm from
the module pad to
SIM card holder.
SIM1_
DATA
54
I/O
SIM data
3V：
VOLmax=0.4
VOHmin=
SIM1_VDD-0.4
1.8V:
VOLmax=
0.15*SIM1_VDD
VOHmin=
SIM1_VDD-0.4
SIM1_
CLK
55
O
SIM clock
3V：
VOLmax=0.4
VOHmin=
0.9*SIM1_VDD
1.8V:
VOLmax=
0.12*SIM1_VDD
VOHmin=
0.9*SIM1_VDD
SIM1_RST
53
O
SIM reset
3V：
VOLmax=0.36
VOHmin=
0.9*SIM1_VDD
1.8V:
VOLmax=
0.2*SIM1_VDD
VOHmin=
0.9*SIM1_VDD
SIM1_
GND
52
SIM ground
SIM_PRES
ENCE
57
I
SIM card detection
VILmin=-0.3V
VILmax=
0.25*VDD_EXT
VIHmin=
0.75*VDD_EXT
VIHmax=
If unused, keep these
pins open.
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Confidential