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RDR-3100 User Manual
5. HW Interface
5.1 Connector Type：20 Pin Header，2.0 mm pitch (J2)
Pin
NO
Signal Name I/O
Description Characteristics
1 N.C None connector
2 GPS 5V I +5V DC Power Input DC +5V ± 1%.
3 RTC (Backup
voltage)
I User Supply DC +2.6 ~
+3.6V
DC +2.6 ~ +3.6V.
Current ≤ 10uA w/o battery
4 GPS 5V I +5V DC Power Input
5 Reset I Reset (Active low)
8.0 2.3V V
IH
VV
IL
<>
6 Boot I Boot mode VVVV
ILIH
855.00.3V- 995.115.3 ≤≤≥≥
7 Back (Reverse
line)
I Forward or Back Forward (Hi level :>2V)
Backward (Lo level: <0.8V)
8 N.C None connector
9 Odometer I Odometer Input frequency<4k HZ
Vih > 2V Vil<0.8V
10
GND G Ground Reference Ground
11
TXD1 (SiRF 3
TXD1)
O NMEA (transmit) Car PC
(UAR1)
4800bps, 8 data bits, no
parity, 1 stop bit
VVVVV
OLOH
715.0 375.285.2 ≤≥≥
12
RXD1 (SiRF 3
RXD1)
I NMEA (Receive) Car PC
(UAR1)
VVVVV
ILIH
855.00.3V- 995.115.3 ≤≤≥≥
13
GND G Ground Reference Ground
14
TXD2 (SiRF 3
TXD2)
O Can bus data (transmit)
Car PC (UAR2)
Vih > VDD-0.1V Vil<0.6V
VDD:3.3V for MCU
15
RXD2 (SiRF 3
RXD2)
I Can bus data (Receive)
Car PC (UAR2)
Vih > 2V Vil<0.8V
16
GND G Ground Reference Ground
17
GND G Ground
18
GND G Ground Reference Ground
19
N.C NC
20
N.C NC
l GPS_5V
This is the DC power supply input pin for system. .
l GND
GND provides the reference ground.
l BOOT
Set this pin to high for programming flash.
l RXD1
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