8
Hardware
UC-00-M47 EN R1.0
No.
Pin
I/O
Description
8
RESET_N
I
System reset
Active Low
9
VCC_RF
1
O
External LNA power supply
10
GND
—
Ground
11
ANT_IN
I
GNSS antenna signal input
12
GND
—
Ground
13
GND
—
Ground
14
RSV
—
Reserved, must be floating; cannot connect
ground or power supply or peripheral I/O
15
RXD3
I
UART3 receiving data
16
TXD3
O
UART3 transmitting data
17
BIF
—
Built-in function; recommended to add a
through-hole testing point and a 10 kΩ pull-up
resistor; cannot connect ground or power
supply or peripheral I/O, but can be floating.
18
SDA
I/O
I
2
C data
19
SCL
I/O
I
2
C clock
20
TXD1
O
UART1 transmitting data
21
RXD1
I
UART1 receiving data
22
V_BCKP
2
I
When the main power supply VCC is cut off,
V_BCKP supplies power to RTC and relevant
register. Level requirements: 2.0 V ~ 3.6 V, and
the working current is less than 60 μA at
25 °C. If you do not use the hot start function,
connect V_BCKP to VCC. Do NOT connect it to
ground or leave it floating.
23
VCC
I
Supply voltage
24
GND
—
Ground
1
Not recommended to take VCC_RF as ANT_BIAS to feed the antenna See section 3.1 for more details.
2
Not supported currently, and keep this pin floating.
