Quectel BC66 - Page 18

NB-IoT Module Series
BC66 Hardware Design
BC66_Hardware_Design 17 / 59
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
RXD_AUX
28
DI
Receive data
from TXD of DTE
1.8V power domain.
TXD_AUX
29
DO
Transmit data to
RXD of DTE
Debug UART Port
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
RXD_DBG
38
DI
Receive data
from TXD of DTE
1.8V power domain.
TXD_DBG
39
DO
Transmit data to
RXD of DTE
Ringing Signal
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
RI
20
DO
Ring indication
signal
1.8V power domain.
USIM Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
SIM_VDD
14
DO
USIM card
power supply
Vnorm=1.8V
SIM_RST
12
DO
USIM card reset
signal
V
OL
max=0.15×SIM_VDD
V
OH
min=0.85×SIM_VDD
SIM_DATA
11
IO
USIM card data
signal
V
IL
max=0.25×SIM_VDD
V
IH
min=0.75×SIM_VDD
V
OL
max=0.15×SIM_VDD
V
OH
min=0.85×SIM_VDD
SIM_CLK
13
DO
USIM card clock
signal
V
OL
max=0.15×SIM_VDD
V
OH
min=0.85×SIM_VDD
SIM_GND
10
GND
Specified
ground for USIM
card
Antenna Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
RF_ANT
35
IO
RF antenna
interface
50Ω characteristic
impedance
USB Interface