NB-IoT
Module Series
BC660K-GL Hardware Design
BC660K-GL_Hardware_Design 18 / 57
DBG_RXD
38
DI
Debug UART
receive
V
IL
max = 0.2 × VDD_EXT
V
IH
min = 0.7 × VDD_EXT
VDD_EXT
power domain.
DBG_TXD
39
DO
Debug UART
transmit
V
OL
max = 0.15
×
VDD_EXT
V
OH
min = 0.8
×
VDD_EXT
RI Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
RI
20
DO
Ring indication
V
OL
max = 0.15
×
VDD_EXT
V
OH
min = 0.8
×
VDD_EXT
VDD_EXT
power domain.
USIM Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
USIM_VDD
14
PO
USIM card
power supply
Vnom = 1.8/3.0 V
-
USIM_CLK
13
DO
USIM card clock
V
OL
max = 0.15 × USIM_VDD
V
OH
min = 0.8 × USIM_VDD
USIM_RST
12
DO
USIM card reset
V
OL
max = 0.15 × USIM_VDD
V
OH
min = 0.8 × USIM_VDD
USIM_DATA
11
DIO
USIM card data
V
IL
max = 0.2 × USIM_VDD
V
IH
min = 0.7 × USIM_VDD
V
OL
max = 0.15 × USIM_VDD
V
OH
min = 0.8 × USIM_VDD
USIM_GND
10
Dedicated
ground for
USIM card
-
Antenna Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
ANT_RF
35
DIO
RF antenna
interface
-
50
Ω
characteristic
impedance
GPIO Interfaces
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
GPIO1
3
DIO
General-purpose
input/output
V
IL
max = 0.2
×
VDD_EXT
V
IH
min = 0.7
×
VDD_EXT
V
OL
max = 0.15
×
VDD_EXT
V
OH
min = 0.8 × VDD_EXT
VDD_EXT
power domain.
If unused, keep
these pins open.
GPIO2
4
DIO
General-purpose
input/output
GPIO3
5
DIO
General-purpose
input/output
