WiFi1500CF Plug-In Hardware User Guide JA03-UM-WiFi
Page 6 Rev: P00 Date: 03/13/14
© Copyright 2014 Janus Remote Communications
Specifications subject to change without notice
All Rights Reserved See website for latest revision. Not intended for life support applications.
2. WiFi1500CF Overview continued
2.4 Power Connections
SUPPLY – 5.0 volt supply for the module (referenced to the GROUND pins). The two SUPPLY pins (pins 1 and 2) are
internally connected together.
PWRMON / VAUX – These pins are connected to the internal VIO supply that powers the level shifters used on
several of the I/O pins. The two pins are internally connected; the different names are used to maintain compatibility
with other CF Plug-In products. This voltage can be used as a reference for an external interface. The VIO supply
can be connected to an internal 2.8 volt supply or an internal 3.3 volt supply. The default is the 2.8 volt supply so
as to be compatible with the CF Plug-In host products (e.g T2, 400AP). See the Configuration Options section for
information on changing the VIO supply.
The following I/O pins use the level shifters or are associated with the VIO supplies:
Pin
Name
Pin
Name
4
RXD
34
GPS_RX
1
6
CTS
35
GPS_TX
1
8
1PPS
1
36
ASYNC
9
TXD
37
GPIO10
11
RTS
38
SPI_WAKE
13
UART1_TX
40
SPI_MISO
14
UART1_RX
41
SPI_MOSI
15
GPIO30
1
42
SPI_CS
16
GPIO31
43
SPI_CLK
17
SERVICE
2
1. These pins are not connected on the WiFi1500CF v2.0 (w/o GPS)
2. This pin uses a discrete transistor implementation for a level shifter.
ENABLE – Used to disable the GS1500M and level shifter power supplies. This pin is internally pulled up to the
SUPPLY voltage which enables the power supplies by default. Pulling this pin low will disable the internal GS1500M
and level shifter power supplies. The GPS supply is unaffected. This can allow for reduced power consumption by
disabling the GS1500M WiFi module while allowing the GPS receiver to continue to operate.
2.5 Screw Mounting
The WiFi1500CF allows for the use of a #4 machine screw to help keep a socketed module in place where
environmental variables may cause problems otherwise. If the user wishes to have a stand-off underneath the
module to help alleviate possible stress from mounting hardware, below are the Janus part numbers and associated
drawings for an available solution.
4-40 Hex Female Stand-off: MC-0356-G
4-40 3/16” Pan Head Phillips Machine Screw: MC-0357-G
Figure 2. Screw Diagram
