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LED Status Indicators
The XBee 5V/3.3V Adapter has four LEDs onboard for easy feedback of module status. These four LED
colors and functions are listed in the table below:
LED Color
Function
Blue
Power`
Yellow
Module ON (not in standby)
Red
RSSI
Green
Associate
Connecting and Testing
While the XBee RF Modules are 3.3V devices, the XBee 5V/3.3V Adapter provides a means to interface
your XBee with a BASIC Stamp or other 5 V microcontroller. The DIN, DOUT and /RTS pins interface to
the XBee through a 74LVC244A buffer, safely regulating 5 V signals to 3.3 V.
The supply voltage (whether 3.3 V or 5 V) should be connected to the VDD pin on the adapter board,
which is run through a 3.3V regulator and supplied to the XBee through the VCC pin. Do not connect
an additional external voltage supply to the VCC pin if power is already applied through VDD.
This could damage to your XBee module.
Caution: Voltage regulator supply current limitation.
The FAN2500S33X regulator used on Rev A of this adapter is rated at 100 mA continuous, 300 mA peak
current.
VCC may be used as a 3.3 V supply output, but be sure that you budget enough current for
your XBee module as well as any other device you might supply through this regulator. The regular XBee
modules (Series 1 and Series 2) draw less than 55 mA, but XBee Pro modules can draw over 200 mA
when in a continuous-transmit state. While this adapter board can supply enough current for the
intermittent transmissions of XBee Pro modules typical to many common uses, applications requiring
continuous, sustained transmissions from XBee Pro modules would be better suited to the XBee SIP
Adapter (#32402), or the XBee Adapter Board (#32403) with an external regulator (not included).
Module Dimensions
Copyright © Parallax Inc.
XBee 5V/3.3V Adapter (#32401)
v1.2 7/27/2010 Page 4 of 6
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