Embedded GPS Module
PINOUT DESCRIPTION
Pin Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Signal Name
NC
NC
TXD0
RXD0
NC
DVCC
GND
NC
NC
RESETN
VCC BAT
NC
RF GND
RF GND
RF GND
RF IN
RF GND
VCC RF
VCC ANT
NC
NC
NC
NC
BAUD SEL0
BAUD SEL1
I/O
-
-
O
I
-
-
-
-
-
I
-
-
-
-
-
I
-
-
-
-
-
-
-
I
I
Description
GPS-41SMDR
GPS-41SMDF
No connection
No connection
3.3V LVTTL async serial output, to output NMEA message
3.3V LVTTL async serial input, to input binary commands
No connection
Regulated 3.3V supply input for digital section
Ground
No connection
No connection
Manual reset input, active LOW. Leave open if not used.
2.0V ~ 3.9V supply voltage to sustain RTC and SRAM data. Connect to
GND if not used; will cold start every time.
No conection
RF ground
RF ground
RF ground
GPS signal input. 50Ω impedance.
RF ground
Regulated 3.3V supply voltage for the RF section
Power input for active antenna. Leave open if not used.
No connection
No connection
No connection
No connection
Baud rate selection 0
Baud rate selection 1
BAUDSEL[1:0] 00
01
10
11
4800 baud
9600 baud
19200 baud
38400 baud
26
27
28
GPIO11
(LED)
NC
P1PPS
O
-
O
3.3V GPIO, default used for GPS status indication
No connection
1 pulse per second time mark
1PPS Output
The GPS receiver is in navigation mode upon power-up, with 1PPS output free running. After 3 minutes of valid
position fix and remaining under static-mode, the receiver changes to timing-mode, with 1PPS output signal
synchronized to the UTC second. The receiver will change to navigation-mode, with 1PPS output free running,
if the receiver is in motion. The 1PPS output will become synchronized to the UTC second again after the
receiver had remained in static mode for 3 minutes.
DS-41SMD-2 June ’06
©2006 RF Solutions Ltd, www.rfsolutions.co.uk
Tel 01273 898000 Fax 01273 480661
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