Users Manual

GSM/GPRS Module Series
M66 Hardware Design
M66_Hardware_Design Confidential / Released 19 / 82
3.1.2. Pin Description
Table 3: IO Parameters Definition
Type Description
IO Bidirectional input/output
DI Digital input
DO Digital output
PI Power input
PO Power output
AI Analog input
AO Analog output
Table 4: Pin Description
Power Supply
PIN Name PIN No. I/O Description DC Characteristics Comment
VBAT 42,43 PI
Main power supply of
module:
VBAT=3.3V~4.6V
V
I
max=4.6V
V
I
min=3.3V
V
I
norm=4.0V
Make sure that
supply
sufficient
current in a
transmitting
burst typically
rises to 1.6A.
VRTC 44 IO
Power supply for RTC when
VBAT is not supplied for the
system.
Charging for backup battery or
golden capacitor when the
VBAT is applied.
V
I
max=3.3V
V
I
min=1.5V
V
I
norm=2.8V
V
O
max=3V
V
O
min=2V
V
O
norm=2.8V
I
O
max=2mA
Iin≈10uA
If unused, keep
this pin open.
VDD_ 24 PO Supply 2.8V voltage for V
O
max=2.9V 1. If unused,