User's Manual

GSM/GPRS Module Series
M85 Hardware Design
M85_Hardware_Design Confidential / Released 22 / 88
PCM_OUT
20
O
PCM data output
VIHmin=
0.75×VDD_EXT
VIHmax=
VDD_EXT+0.2
VOHmin=
0.85×VDD_EXT
VOLmax=
0.15×VDD_EXT
If unused, keep
these pins open.
PCM_SYNC
21
O
PCM frame
synchronization
SD Card
PIN NAME
PIN NO.
I/O
DESCRIPTION
DC
CHARACTERISTICS
COMMENT
SD_CMD
34
O
SD command
VILmin=0V
VILmax=
0.25×VDD_EXT
VIHmin=
0.75×VDD_EXT
VIHmax=
VDD_EXT+0.2
VOHmin=
0.85×VDD_EXT
VOLmax=
0.15×VDD_EXT
If unused, keep
these pins open.
SD_CLK
35
O
SD clock
SD_DATA0
36
I/O
SD data
Antenna Interface
PIN NAME
PIN NO.
I/O
DESCRIPTION
DC
CHARACTERISTICS
COMMENT
RF_ANT
63
I/O
RF antenna pad
Impedance of 50Ω
Other Interface
PIN NAME
PIN NO.
I/O
DESCRIPTION
DC
CHARACTERISTICS
COMMENT
RESERVD
1, 3,
22~33,
38, 39,
44, 58,
75~78,
83
Keep these pins
open.