W S N 8 0 2 G C A /W S N 8 0 2 G P A B lo c k D ia g r a m
G N D
D IA G _ T X
D IA G _ R X
G P IO 0
R A D IO _ T X D
5
6
7
8
9
R A D IO _ R X D
/H O S T _ C T S
/H O S T _ R T S
P W M 0
G P IO 2
G P IO 1
G P IO 3
R S V D
V C C
G N D
+ 3 .3 V
4
3
1
2
3 2 .7 6 8 k H z
4 4 M H z
F ilte r
8 0 2 .1 1 g
L o w C u rre n t
T r a n s c e iv e r
B a lu n
&
B P F
1 0
1 1
1 2
1 3
1 4
1 5
R e g
+ 1 .8 V
R e g
1 6
G N D
1 7
/R E S E T
1 8
A D C 0
1 9
A D C 1
2 0
M IS O
2 1
M O S I
2 2
/S S
2 3
S C L K
2 4
3 .3 V _ O U T
2 5
A D C
R E F
2 6
W A K E _ IN
2 7
W A K E _ O U T
2 8
G N D
2 9
R S V D
3 0
G N D
Figure 1
WSN802GCA/WSN802GPA Hardware
The WSN802GCA and WSN802GPA operate in the inter-
national 2.4 GHz ISM band over the frequency range of
2401-2474 MHz, with a nominal RF output power of
10 mW and a nominal antenna gain of 0 dBi. WSN802G
modules support four standard 802.11g RF data rates -
1, 2, 5.5 and 11 Mbps.
The WSN802G transceiver module provides a variety of
hardware interfaces. There are two serial interfaces, one
for data and a second for diagnostics. The data port sup-
ports standard serial baud rates from 1.2 to 921.6 kbps,
with optional hardware flow control. The diagnostic port
supports standard baud rates from 1.2 to 115.2 kbps.
The WSN802G also includes an SPI port that supports
data rates up to 2 Mbps in slave mode, and up to
11 Mbps in master mode.
The WSN802G includes two 10-bit ADC inputs, one
16-bit PWM (DAC) output, and four general purpose I/O
(GPIO) ports to support sensor network applications.
WSN802G modules with integral antenna are available in
two mounting configurations. The WSN802GCA is de-
signed for solder reflow mounting, and the WSN802GPA
is designed for plug-in connector mounting.
Rev F WSN802G Firmware
The major firmware components in the WSN802G in-
clude the 802.11g stack and the application protocol.
The WSN802G acts as a UDP client to a data and/or
sensor application running on a network server.
The application protocol supports three operating modes:
(1) sleeping sensor node with timer or interrupt auto-
reporting, (2) sleeping serial data node with timer or inter-
rupt wake-up and (3) always on sensor or serial data
node with auto-reporting. Modes 1 and 2 take full advan-
tage of the very low sleep current capability of the
WSN802G. The module sleeps unless the WAKE_IN
input is asserted or the
AutoReport
timer fires. A
Wake-
Timeout
timer is provided to hold the module awake for
a configurable period. The
WakeTimout
timer is held in
reset as long as WAKE_IN is asserted, serial data is
being received, an RF packet is being sent or received,
or if the module is uncommissioned.
The WSN802G asserts WAKE_OUT whenever it is
awake to notify its external host. The module also sends
an I/O status report automatically each time WAKE_IN is
asserted, and/or each time the
AutoReport
timer fires.
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©2009-2010 by RF Monolithics, Inc.
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WSN802GCA/PA - 10/05/10
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