XB Sensor Pin Description

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22 pins available to the user, 7 of which can be analog inputs



Refer to the Getting started section for details on connecting your wireless components.  

Dual Use AD pins
 
On reset or power up the AD pins are configured as digital inputs.  To change those to ADs, the user must include the AD11.bas library and call InitAD
 
PWM pins
 
All pins can be used for the software PWM function, and 8 pins can be used for the hardware driven HWPWM function.
 
 
One Wire interfacing
 
The optional RJ-45 connection was designed with the idea of driving up to 7 one wire sensors, with P0.7 available as a high current drive that can power up the sensors through a 8 pin SMT (CTS 745C type) resistor on the back side of the board.
 
That connector is not limited to that, as I2C, SPI or other serial options can be used.
 
Baud rate settings
 
The XB sensor default baud setting is 19.2Kb, and the default setting for the Xbee modules are 9600 baud.  The Xbee sensor baud rate can be set with the X-CTU utility from Digi. Some details in the installation section.
 
When the USB dongle is connected that takes precedence over the serial connection on UART0 to the Xbee module.  This is done by sensing the Vin voltage (see the schematic) for details.
 
Power
 
The XB sensor primary power supply is 3.3V.  This voltage is available for user circuitry at 3 pins in the prototype area.  This can be derived from either the battery connection, or the mini-B USB connection.  When connected to the USB mini-B connector, a Li-Poly battery can be charged.  The charge current is set at 500 mA.  These batteries are available in various sizes from SparkFun.
 
During debugging, the USB dongle can be connected and it will supply power to the board through Vin.  But the battery should not be charged this way as it may exceed the current capability of the USB debug dongle.
 
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Optional components
 
Coridium does not stock the Xbee modules, as there are too many varieties.  We will quote XB sensor boards with Xbee modules for orders of 10 or more boards.
 
This board is designed to fit into a Polycase LP-11 enclosure
 
In addition, the board has been designed to accept optional RJ45 vertical connections using Bel Stewart SS-74301-002 or TE connectivity 5556416, available from Digikey.
 
Also a vertical power connection can be made with Cui PJ-032A 2.1mm barrel connector.
 
Space is also provided for a reset switch.