Digi XBee - Table of Contents

XBee® Wi-Fi RF Modules
© 2013 Digi International, Inc. 3
Contents
XBee® Wi-Fi RF Module .......................................................................................................................... 1
1. Overview ....................................................................................................................................... 8
Specifications ...................................................................................................................................... 8
General Specifications .................................................................................................................... 8
RF Specifications ............................................................................................................................. 8
Electrical Specifications ................................................................................................................ 13
Serial Communications Specifications .......................................................................................... 13
UART ............................................................................................................................................. 13
SPI ................................................................................................................................................. 14
GPIO Specifications ....................................................................................................................... 14
Agency Approvals ......................................................................................................................... 15
Mechanical Drawings ................................................................................................................... 15
Pin Signals ......................................................................................................................................... 17
Design Notes ..................................................................................................................................... 18
Power Supply ................................................................................................................................ 19
Recommended Pin Connections .................................................................................................. 19
Board Layout ................................................................................................................................ 19
Design Notes for PCB Antenna Modules ...................................................................................... 20
Design Notes for RF Pad ............................................................................................................... 23
Mounting Considerations – Xbee Wi-Fi Through-hole ................................................................. 25
2. RF Module Operation ....................................................................................................................... 26
Serial Communications ..................................................................................................................... 26
UART Communications ................................................................................................................. 26
SPI Communications ..................................................................................................................... 27
Serial Buffers .................................................................................................................................... 29
Serial Receive Buffer ..................................................................................................................... 29
Serial Transmit Buffer ................................................................................................................... 29
UART Flow Control ....................................................................................................................... 30
Serial Interface Protocols ................................................................................................................. 31
Transparent Operation ................................................................................................................. 31
API Operation ............................................................................................................................... 31
A Comparison of Transparent and API Operation ........................................................................ 32
Modes of Operation ......................................................................................................................... 33
Idle Mode ..................................................................................................................................... 33