Product Info

NB-IoT Module Series
BC660K-GL Hardware Design
BC660K-GL_Hardware_Design
3-19
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1. Keep all reserved and unused pins unconnected.
2. When VIO_SEL is grounded and VBAT ˂ 3.3 V, VDD_EXT = VBAT;
When VIO_SEL is grounded and VBAT ≥ 3.3 V, VDD_EXT = 3.3 V;
When VIO_SEL is floating, VDD_EXT = 1.8 V.
3. “*” means under development.
If unused, keep
these pins open.
GPIO3
5
IO
General-purpose
input/output
GPIO4
6
IO
General-purpose
input/output
GRFC Interfaces
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
GRFC1
54
DO
Generic RF
controller
1.8 V power
domain.
If unused, keep
these pins open.
GRFC2
55
DO
Generic RF
controller
Other Interface Pin
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
VIO_SEL
52
DI
IO Voltage
selection
Floating: 1.8 V
0: 3.3 V
Control
VDD_EXT
voltage select
1.8 V or 3.3 V
Reserved Pins
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
RESERVED
2, 8, 21–23, 25, 26, 28–33, 44–51, 53
Keep these pins
open.
NOTES