NB-IoT Module Series
BC65 Hardware Design
BC65_Hardware_Design 16 / 55
3.3. Pin Description
Table 4: I/O Parameters Definition
Table 5: Pin Description
Type
Description
AI
Analog Input
AO
Analog Output
DI
Digital Input
DO
Digital Output
IO
Bidirectional
PI
Power Input
PO
Power Output
Power Supply
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
VBAT
42, 43
PI
Power supply for
the module
Vmax = 4.2 V
Vmin = 3.2 V
Vnorm = 3.8 V
VBAT = 3.2
–4.2 V
VDD_EXT
24
PO
Provides 1.8 V
for external
circuit
Vnorm = 1.8 V
No voltage output in
Deep Sleep mode.
It is intended to
supply power for the
module
’s pull-up
circuits, and thus it
is not recommended
to be used as the
power supply for
external circuits.
GND
1, 10, 27, 34, 36, 37, 40, 41
Power Key Interface
