Characteristics, Reb-3300 operational manual – RoyalTek REB-3300 User Manual
Page 11
REB-3300 Operational Manual
Hardware interface
Definition of Pin assignment
Pin # Signal Name
I/O Description
Characteristics
1
VCC
I
DC Supply Voltage
input
DC +3.3V
±10%
2 GND
G
Ground
Digital
Reference
Ground
3 Bootselect I Boot
mode
VCC
V
V
VCC
V
V
IL
IH
*
3
.
0
*
7
.
0
≤
≥
4 RXA
I Serial
port
A
VCC
V
V
VCC
V
V
IL
IH
*
3
.
0
*
7
.
0
≤
≥
5 TXA
O
Serial
port
A
V
V
V
V
OL
OH
4
.
0
4
.
2
≤
≥
6
TXB
O Serial port B
V
V
V
V
OL
OH
4
.
0
4
.
2
≤
≥
7
RXB
I
Serial port B
VCC
V
V
VCC
V
V
IL
IH
*
3
.
0
*
7
.
0
≤
≥
8
GPIO3
I/O General –purpose I/O
V
V
V
V
VCC
V
V
VCC
V
V
OL
OH
IL
IH
4
.
0
4
.
2
*
3
.
0
*
7
.
0
≤
≥
≤
≥
9
RF_ON
O Indicates power state
of RF part
V
V
V
V
OL
OH
0
85
.
2
=
=
10
GND
G Digital Ground
Digital Reference Ground
11
|
16
GND_A
G Analog Ground
Analog Reference Ground
17
RF_IN
I
GPS Signal input
50 Ω @1.57542GHz
18
GND_A
G Analog Ground
Analog Reference Ground
19 V_ANT_IN
I Active
Antenna
Bias
voltage
Receiving DC power supply for active antenna
bias.
20 VCC_RF
O Supply
Antenna
Bias
voltage
V
V
O
0
.
3
=
±0.3
21
V_BAT
I
Backup voltage supply
battery)
(w/o
10uA
Current
3.6V
~
2.6
DC
≤
+
+
22
Reset
I
Reset (Active low)
8
.
0
2.3V
V
IH
V
V
IL
<
>
23
GPIO10
I/O General purpose I/O
V
V
V
V
VCC
V
V
VCC
V
V
OL
OH
IL
IH
4
.
0
4
.
2
*
3
.
0
*
7
.
0
≤
≥
≤
≥
11