RoyalTek Confidential
11
RET-3570LP User Manual
(Input impedance 50
Ω
; Frequency 87.5~108MHz)
15 GND
G
Ground
Reference
Ground
16 GND
G
Ground
Reference
Ground
17
GPS_RF_IN
I
GPS Signal input
50
Ω
@1.57542GHz
18 GND
G
Ground
Reference
Ground
19 V_ANT_IN I Active Antenna Bias
voltage
Receiving DC power supply for active antenna bias.
20 VCC_RF_OUT
O
Supply
Antenna
Bias
voltage
%
5
85
.
2
±
=
V
V
O
Current<30mA
21
V_RTC_3V3
I
Backup voltage supply
10uA
Current
3.6V
~
2.5
DC
≤
+
+
22
RESET
I
Reset (Active low)
8
.
0
;
2.3
V
V
V
V
IL
IH
<
>
23 N.C
24 N.C
25
GPIO4
I/O General purpose I/O
V
V
V
V
V
V
IL
IH
855
.
0
0.3
-
15
.
3
995
.
1
≤
≤
≤
≤
V
V
V
V
V
OL
OH
715
.
0
85
.
2
375
.
2
≤
≤
≤
26
GPIO0
I/O General purpose I/O
V
V
V
V
V
V
IL
IH
855
.
0
0.3
-
15
.
3
995
.
1
≤
≤
≤
≤
V
V
V
V
V
OL
OH
715
.
0
85
.
2
375
.
2
≤
≤
≤
27 N.C
28 N.C
29
PPS
O One pulse per second
V
V
V
V
V
OL
OH
715
.
0
85
.
2
375
.
2
≤
≤
≤
30 GND
G
Ground
Reference
Ground
31
V_TMC_3V3 I
DC Supply Voltage input
DC +3.3V
±
5%
V_GPS_3V3 (+3.3V DC power Input)
This is the DC power supply input pin for GPS system. It provides voltage for module.
GND
GND provides the ground.
BOOT
Set this pin to high for programming flash.
RXA
This is the main receiver channel. The main function is to receive software commands from
SIRFdemo software or other user’s application.
RXB
This is the auxiliary receiving channel. The main function is to input differential corrections,
then deliver them to the board for DGPS navigation.
