d15 Modem Integration and Application Developers Guide version draft 0.53 Page 42 of 181
3.9 How to connect 3788 Handset to D15.
In order to connect the handset (3788) to the D15 there is a need of the following connections in the user
board.
You can see below the circuits used in the D15 Evaluation board for this purpose as an example.
Figure 23 – Handset Connections / HW required
3.10 GPS
Considerations
The D15 DV with GPS model includes internally a M12 GPS receiver from Motorola.
The GPS receiver is powered internally from the D15 with 3Vdc.
All the other lines of the GPS were routed to the user connector (ZIF 36 pin).
The GPS lines in the D15 user connector 36 pin ZIF socket are as follows:
Table 4 – The GPS lines in the D15 (user connector 36 pin ZIF socket)
D15 User Connector Pin # Function
2
GPS RXD receive data in 3V logic.
3
GPS TXD transmit data in 3V logic.
34
Antenna voltage input 3 or 5 Vdc. (active antennas)
35
RTCM input - 3V logic.
36
1pps output in 3V logic.
The GPS receiver is a stand alone unit in the D15.
More details about the M12 module can be viewed on the web at
http://www.synergy-gps.com/M12_Oncore.html.
8
7
6
5
4
3
2
1
(10.5- 15V) 12V
4.7K
4.7K
2.2uF
4.7K
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N ch
P ch
DownLink
Uplink
On/Off
Handset Connector
In the EV board PCB
RJ-45
8
6
4
2
7
5
3
1
RJ45
PCB TOP View
Mechanical
hols
TAB
To D15 User Connector
DownLink
Uplink
DSC_EN
