Users Manual

GSM/GPRS Module Series
M66 Hardware Design
M66_Hardware_Design Confidential / Released 22 / 82
V
OH
min=
0.85×SIM_VDD
diode array.
Maximum
trace length is
200mm from
the module
pad to SIM
card holder.
SIM_ DATA 11 IO SIM data
V
IL
max=
0.25×SIM_VDD
V
IH
min=
0.75×SIM_VDD
V
OL
max=
0.15×SIM_VDD
V
OH
min=
0.85×SIM_VDD
SIM_ RST 12 DO SIM reset
V
OL
max=
0.15×SIM_VDD
V
OH
min=
0.85×SIM_VDD
SIM_
GND
10 SIM ground
ADC
PIN Name PIN No. I/O Description DC Characteristics Comment
AVDD 8 PO
Reference voltage of
ADC circuit
V
O
max=2.9V
V
O
min=2.7V
V
O
norm=2.8V
If unused,
keep this pin
open.
ADC0 9 AI
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 30 DO PCM clock
V
IL
min= 0V
V
IL
max=
0.25×VDD_EXT
V
IH
min=
0.75×VDD_EXT
V
IH
max=
VDD_EXT+0.2
V
OH
min=
0.85×VDD_EXT
V
OL
max=
0.15×VDD_EXT
If unused,
keep this pin
open.
PCM_
SYNC
31 DO
PCM frame
synchronization
PCM_
IN
32 DI PCM data input
PCM_
OUT
33 DO PCM data output
Antenna Interface
PIN Name PIN No. I/O Description DC Characteristics Comment
RF_
ANT
35 IO GSM antenna pad Impedance of 50Ω