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208     Bu il d  Y o ur  O w n  Q u a d c o p t e r



                               Features/Specifications  Description
                               Frequency/modulation    O-QPSK data in 5.0 MHz channels and full spread-spectrum
                                                       encode and decode (modified DSSS)
                                                       Operates on one of 16 selectable channels in the 2.4 GHz
                                                       ISM band
                               Maximum bandwidth       250 kbps (compatible with the 802.15.4 Standard)
                               Receiver sensitivity    <- 92 dBm (typical) at 1.0% packet error rate
                               Maximum output power    0 dBm nominal, programmable from -27 dBm to 4 dBm
                               Power supply            2.0 to 3.4 V
                               Power conservation modes  < 1 μA Off current
                                                       1 μA Typical hibernate current
                                                       35 μA Typical doze current (no CLKO)
                               Timers/comparators      Four internal timer comparators available to supplement
                                                       MCU resource
                               Clock outputs           Programmable frequency clock output (CLKO) for use by MCU
                               Number of GPIO pins     7
                               Internal oscillator     16 MHz with onboard trim capability
                               Operating temperature range   - 40 to 85°C
                               Package size            QFN-32 Small form factor (SFF)

                                             ™
                             Table 8.5  Freescale  MC13192 Features and Specifications

                                The XBee pins are detailed in a logical arrangement in Figure 8.18 for your information.
                             Just be aware that only four of the pins are needed for this project, and they are shown with
                             an asterisk next to the pin label. All the pin and function descriptions are shown in Table 8.6.
                                There are a considerable number of functions available to you if needed; however, this
                             project requires only the most minimal functions for simple and reliable data transfers.
                             Thankfully, the XBees automatically connect and establish reliable communications.






















                             Figure 8.18  Logical XBee pinout diagram.
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