GSM/GPRS Module Series
M85 Hardware Design
M85_Hardware_Design Confidential / Released 21 / 88
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 trace
length is 200mm
from the module
pad to SIM card
holder.
SIM2_VDD
71
SIM1_CLK
55
O
SIM clock
VOLmax=
0.15×SIM_VDD
VOHmin=
0.85×SIM_VDD
SIM2_CLK
72
SIM1_ DATA 54
I/O
SIM data
VILmax=
0.25×SIM_VDD
VIHmin=
0.75×SIM_VDD
VOLmax=
0.15×SIM_VDD
VOHmin=
0.85×SIM_VDD
SIM2_DATA
73
SIM1_RST
53
O
SIM reset
VOLmax=
0.15×SIM_VDD
VOHmin=
0.85×SIM_VDD
SIM2_RST
74
SIM1_
PRESENCE
57
I
SIM card detection
VILmin=0V
VILmax=
0.25×VDD_EXT
VIHmin=
0.75×VDD_EXT
VIHmax=
0.2
If unused, keep
these pins open.
SIM_GND
52
SIM ground
ADC
PIN NAME
PIN NO.
I/O
DESCRIPTION
DC
CHARACTERISTICS
COMMENT
ADC0
2
I
General purpose
analog to digital
converter.
Voltage range:
0V to 2.8V
If unused, keep
this pin open.
PCM
PIN NAME
PIN NO.
I/O
DESCRIPTION
DC
CHARACTERISTICS
COMMENT
PCM_CLK
19
O
PCM clock
VILmin= 0V
VILmax=
0.25×VDD_EXT
If unused, keep
these pins open.
PCM_IN
18
I
PCM data input
