WiFi1500CF Plug-In Hardware User Guide JA03-UM-WiFi
Page 7 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.
3. WiFi Module
The GainSpan GS1500M provides the WiFI connectivity for the WiFi1500CF. A complete description of this module
is beyond the scope of this document. Detailed hardware and operational information can be found in the GS1500M
documentation listed in the Applicable Documents section.
3.1 WiFi Module Connections
The connections between the GS1500M module and the WiFi1500CF pins are shown in the table below.
GS1500M
WiFi1500CF GS1500M
WiFi1500CF
Pin
Name
Interface
Pin
Name
Pin Name
Interface
Pin Name
1
GND
GND
25
I2C_CLK
Pullup to VIO
32
1
I2C_SCL
2
JTAG_TCLK
N/C
26
I2C_DATA
Pullup to VIO
31
1
I2C_SDA
3
JTAG_TDO
N/C
27
SSPI_DOUT
Level Shifter
44
SPI_MISO
4
JTAG_TDI
N/C
28
SSPI_CLK
Level Shifter
43
SPI_CLK
5
JTAG_TMS
N/C
29
SSPI_CS
Level Shifter
42
SPI_CS
6
JTAG_nTRST
N/C
30
SSPI_DIN
Level Shifter
41
SPI_MOSI
7
ALARM1
N/C
31
VIN_3V3
3.3V
8
RTC_OUT1
N/C
32
GND
GND
9
VBAT
3.3V
33
EN_1V8
3.3V
10
DC_DC_CNTL
N/C
34
VDDIO
3.3V
11
ADC1
---
44,46
1
ADC1
35
UART1_CTS
N/C
12
ADC2
---
45
1
ADC2
36
UART1_RTS
Pullup to VIO
17
SERVICE
13
ALARM2
N/C
37
UART1_RX
Level Shifter
13
UART1_TX
14
MSPI_DIN
N/C
38
UART1_TX
Level Shifter
14
UART1_RX
15
MSPI_DOUT
N/C
39
UART0_TX
Level Shifter
4
RXD
16
VOUT_1V8
Internal
2
40
UART0_RTS
Level Shifter
6
CTS
17
GND
GND
41
UART0_RX
Level Shifter
9
TXD
18
MSPI_CLK
N/C
42
UART0_CTS
Level Shifter
11
RTS
19
MSPI_CS0
N/C
43
GPIO31
Level Shifter
16
GPIO31
20
MSPI_CS1
N/C
44
GPIO30
Level Shifter
15
GPIO30
21
GPIO21
N/C
45
GPIO29
N/C
22
GPIO20
N/C
46
GPIO28
Level Shifter
38
SPI_WAKE
23
GPIO19
Level Shifter
36
ASYNC
47
EXT_RSTn
Pullup to 3.3V
20
RESET
24
GPIO10
Level Shifter
37
GPIO10
48
GND
GND
--
Antenna
u.FL connector
1 Jumpers must be installed to connect these pins. See the Configuration Option section.
2 The GS1500M VOUT_1V8 pin can be jumpered to the JN3 module’s BOOT pin. See the Configuration Option section.
Antenna
The GS1500M has an on-board PCB (printed circuit board) antenna and a u.FL RF connector to support an external WiFi
antenna. The u.FL connector is located on the edge of the GS1500M module board that overhangs the WiFi1500CF board.
Commands entered via the GS1500’s UART or SPI port can be used to select which antenna is used.
UART interface
UART0 on the GS1500M is brought out through a level shifter and support is provided for TX, RX, CTS and RTS signals. While
the GS1500 has DTE (Data Terminal Equipment) UART configuration, an internal crossover network converts this to appear
as a DCE (Data Communications Equipment) device on the pin-out of the WiFi1500CF. This makes it compatible with host
processors (e.g. Janus 400AP, T2) and other microcontroller devices that typically present a DTE UART interface. The default
settings for the UART0 interface are 9600 baud, 8 bit characters with no parity bits and one stop bit (8N1).
ASYNC
Connected to the GS1500M GPIO19 pin through a level shifter. When enabled via the command interface, this pin can be
used to provide notification of asynchronous messages at the UART0 port. (See ‘Enhanced Asynchronous Notification’ in the
GS1500M Serial-to-WiFi Adapter Application Programming Guide.)
SPI interface
The GS1500M SPI slave port is brought out through a level shifter and support is provided for the SPI_MISO, SPI_MOSI, SPI_CS,
SPI_CLK and the SPI_WAKE pins. The SPI port provided as an alternative to the UART0 interface on the GS1500M, and can
provide faster communication speeds (up to 3 Mbps) than the UART0 interface.
SPI_WAKE
Connected to the GS1500M GPIO28 pin through a level shifter. This pin is asserted high during data transmission periods.
It notifies the host (SPI master) that it can begin receiving data by providing the SPI clock signal. In addition, it provides an
indication that the SPI interface is operational following start up. (See ‘SPI Interface Handling‘ and ‘Node Start Up Handling’ in
the GS1500M Serial-to-WiFi Adapter Application Programming Guide.)
