Timelox EN110 Zigbee Endnode User Manual Operational Description

Timelox AB Zigbee Endnode Operational Description

User Manual

Operational Description ZigBee Endnode The information in this document is subject to change at the sole discretion of Timelox without notice. Any use, operation or repair in contravention of this document is at your own risk. Timelox does not assume any responsibility for incidental or consequential damages arising from the use of this document. All information in this document is the property of Timelox AB. Unauthorized use and reproduction is prohibited. Copyright © 2012.
© Timelox AB 2012 66 3081 050-0 2 Table of Contents 1. INTRODUCTION........................................................................................................................ 3 1.1 Microprocessor.............................................................................................................................. 3 1.1.1 Reference Oscillator............................................................................................................... 3 1.2 Interfaces and Peripherals ............................................................................................................. 3 1.2.1 Background Debug Module ................................................................................................... 3 1.2.2 Communications Interface...................................................................................................... 3 1.2.3 LED ........................................................................................................................................ 3 1.2.4 External Serial Memory ......................................................................................................... 3 1.2.5 Voltage Detector..................................................................................................................... 3 1.2.6 Battery Measurement.............................................................................................................. 3 1.3 Power Supply ................................................................................................................................ 4 1.4 RF Front-End................................................................................................................................. 4 1.4.1 Transceiver............................................................................................................................. 4 1.4.2 Rx/Tx Switch.......................................................................................................................... 4 1.4.3 LC Filter ................................................................................................................................. 4 1.4.4 Antenna .................................................................................................................................. 4 1.5 Shield Box..................................................................................................................................... 4
© Timelox AB 2012 66 3081 050-0 3 1. Introduction This document details the operational description of the ZigBee endnode. The ZigBee endnode is intended for proprietary, IEEE 802.15.4 and ZigBee WPAN (wireless personal area network). The ZigBee endnode is based on the MC1321x family, i.e. Freescale’s second-generation ZigBee platform which incorporates a low power 2.4 GHz transceiver and an 8-bit microcontroller into a single LGA package. 1.1 Microprocessor The MC1321x contains a microcontroller based on the HCS08 family of 8-bit MCU (microcontroller units). The MC13213 has 60 KB of flash memory and 4 KB of RAM. The MCU incorporates several functionalities such as UART, SPI, A/D converter, timer/pulse width modulator, keyboard interrupts and a debug module. 1.1.1 Reference Oscillator The ZigBee endnode includes a reference oscillator. The reference frequency is 16.000 MHz with an accuracy below ±40 ppm over the entire operating temperature range. 1.2 Interfaces and Peripherals This section provides an operational description for the peripherals and interfaces. 1.2.1 Background Debug Module The ZigBee endnode includes a BDM (background debug module) interface. The BDM interface to the MCU provides an interface for programming the on-chip memory. The BDM interface can also be used for traditional debugging. 1.2.2 Communications Interface The ZigBee endnode supports two serial interfaces that are selectable through firmware: • UART interface • I2C interface 1.2.3 LED The ZigBee endnode includes a green LED. The functionality of the LED is application specific. 1.2.4 External Serial Memory A serial memory acts as a storage for firmware images used during firmware upgrades of the MCU (microcontroller unit) internal program flash. The serial memory enables bootloading of the endnode firmware over air via SysMon (System Monitor; a maintenance software provided by Timelox) or through direct connection to the communications interface. The serial memory can be entirely shut off to conserve energy. 1.2.5 Voltage Detector A voltage detector detects when the supply voltage goes below 2 V; if this is the case, a reset is made. 1.2.6 Battery Measurement The endnode can measure the supply voltage through an external voltage divider that is controllable via firmware.
© Timelox AB 2012 66 3081 050-0 4 1.3 Power Supply The ZigBee endnode includes a linear regulator with an output of 3 VDC to supply the entire device. 1.4 RF Front-End This section provides a description of the RF front-end. 1.4.1 Transceiver The MC1321x contains an RF transceiver which is an 802.15.4 standard compliant radio that operates in the 2.4 GHz ISM frequency band. The transceiver includes a low noise amplifier, 1mW nominal output power, PA with internal voltage controlled oscillator (VCO), on-board power supply regulation and full spread-spectrum encoding and decoding. An external LC-matching network steps the impedance down to 50Ω balanced and a small ceramic balun allows the differential to single-ended transformation. A 50:50Ω balun is used. 1.4.2 Rx/Tx Switch The ZigBee endnode includes a single pole double throw (SPDT) switch from NEC. The SPDT switch has low insertion loss and high isolation. The Rx/Tx switch is controlled by the transceiver and the Tx chain is active at a logic “0” and the Rx chain is active at a logic “0”. 1.4.3 LC Filter The ZigBee endnode includes an LC filter for suppression of spurious harmonics. The LC filter has a resonant frequency of approximately 2.80 GHz. 1.4.4 Antenna The ZigBee endnode includes an integral PCB antenna. The PCB antenna is an inverted F-antenna with a resonant frequency of approximately 2.45 GHz. The maximum antenna gain is 3.5 dBi. 1.5 Shield Box The following items are covered by a grounded shield box: • microprocessor • transceiver • Rx/Tx switch • LC filter • Crystal • Voltage detector
© Timelox AB 2012 66 3081 050-0 5 Revision history Version Date Initials Description 0.0.1 2009-03-26 JJO Initiation of document 1.0.0 2009-03-27 JJO Release of document 2.0.0 2012-09-17 KG Revision for new endnode

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