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IEEE 802.15.4 subsystem, IEEE 802.15.4 Low-Rate Wireless Personal Area Network (WPAN)
http://projects.qi-hardware.com/index.php/p/ben-wpan/
23c37261b7
We know from CNTR that the capacitance of the 0603 TVS (EPCOS CT0603M4G, 200 pF) is too large and can disturb the USB signal. The 0402 TVS (Panasonic EZJ-P0V080GA, 100 pF) works much better. Since we have lots of 0402 components already, just change the remaining 0603 to 0402, too. - usb.sch (VR1, VR2, VR3): change from 0603 to 0402 and from 5V5 to 5V6 - usb.sch (C1, C2, R1): change from 0603 to 0402 - atrf.sch (R3): set footprint to 0402 - atusb.pro: replaced modules/mini-usb with modules/usb_a_plug - atusb.pro: removed extension from components/balun-smt6.lib - atusb.cmp: update footprints for above changes - atusb.cmp: change 0402 to 0402-M and 0603 to 0603-M, for easier soldering |
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IEEE 802.15.4 Low-Rate Wireless Personal Area Network (WPAN) ============================================================ IEEE 802.15.4 defines physical layers and a media access control for wireless networks. ZigBee and 6loWPAN are based on IEEE 802.15.4. This project aims to add experimental WPAN functionality to the Ben NanoNote, in order to permit evaluation of overall network performance and to examine possible integration into future devices. This work is licensed under the terms detailed in the file COPYING. Hardware architecture --------------------- IEEE 802.15.4 transceiver chips are available from several manufacturers, including Atmel, Freescale, and Texas Instruments. These chips are similar in size, functionality, and cost. The first prototype is based on the Atmel AT86RF230. The RF module will be physically placed on the left side of the LCD module, replacing part of the display's PCB. When installed in the Ben, the transceiver will connect directly via SPI to the Jz4720. For development, a SiLabs C8051F326 microcontroller implements a USB to SPI conversion.