NB-IoT Module Series
BC65 Hardware Design
BC65_Hardware_Design 18 / 55
AUX_RXD
28
DI
Auxiliary UART
receive
1.8 V power domain.
AUX_TXD
29
DO
Auxiliary UART
transmit
Debug UART Interface
Pin Name
Pin No. I/O
Description
DC Characteristics
Comment
DBG_RXD
38
DI
Debug UART
receive
1.8 V power domain.
DBG_TXD
39
DO
Debug UART
transmit
RI Signal
Pin Name
Pin No. I/O
Description
DC Characteristics
Comment
RI
20
DO
Ring indication
1.8 V power domain.
USIM Interface
Pin Name
Pin No. I/O
Description
DC Characteristics
Comment
USIM_VDD
14
PO
USIM card power
supply
Vnorm = 1.8/3.0 V
All signals of USIM
interface should be
protected against
ESD with a TVS
diode array.
Maximum trace
length from the
module pin to USIM
card connector is
200 mm.
USIM_RST
12
DO
USIM card reset
V
OL
max = 0.1 × USIM_VDD
V
OH
min = 0.8 × USIM_VDD
USIM_DATA
11
IO
USIM card data
V
IL
max = 0.2 × USIM_VDD
V
IH
min = 0.7 × USIM_VDD
V
OL
max = 0.1 × USIM_VDD
V
OH
min = 0.8 × USIM_VDD
USIM_CLK
13
DO
USIM card clock
V
OL
max = 0.1 × USIM_VDD
V
OH
min = 0.8 × USIM_VDD
Antenna Interface
Pin Name
Pin No. I/O
Description
DC Characteristics
Comment
ANT_RF
35
IO
Antenna
interface
50Ω impedance
control
Reserved Pins
Pin Name
Pin No. I/O
Description
DC Characteristics
Comment
RESERVED
2
–6, 8, 21–23, 25, 26, 30–33, 44–58
Keep these pins
unconnected.
