YEONHWA M TECH TD 2400MD User Manual

1. TD-2400MD Function

TD-2400MD is the compact size digital radio developed for supporting safety and convenience in

leisure, restaurant, superstores and public area.

No needed license because the operation is in ISM band.

Furthermore, communication range and audio quality are more improved than analogue radios.

TD-2400MD Radio’s main features are as follows;

 Scalable Data Rate : 500Kbps and 1Mbps
 Audio Sampling Rate : 8Kbps
 PLL synthesizer type
 Signal Strength Meter
 Battery Status Indicator
 USB PC Programming
 Various Parameters and PC downloading methods

Circuit Description

TD-2400MD digital radio is consisted of RF module included MG2455, RF AMP to amplify output

power, LED Display that shows condition of drive chip and Data modem which supports RS-232C

after transforming from Digital signal into serial signal.

1. MG2455 ZigBee Chip and peripheral components

MG2455(U11) is the RF module operated in 2.4Ghz ISM band. The module is made with RF

transceiver, RF circuit, 8051 compatible MCU and several components. It follows IEEE802.15.4 and

Zigbee standard regulation. MG2455 includes zigbee stack library as zPULSE.

LM2455 data rate is from 250Kbps to 1Mbps available.

Reset circuit is consisted of Q14, R38 and C52 and operates when the voltage is below 2.5V.

Port P0.1, P0.2, P0.3is used as LED Display Port that shows TD-2400MD performance.

Port P0[5] and P0[6] are connected to EEPROM(U14) for current status restore.

P3[5], P3[6] and P3[7] are for GPIO control.

LM2455(U11)’s feature is as follows;

1) Enhanced Feature

• Scalable Data Rate : 250Kbps for ZigBee, 500Kbps and 1Mbps for private application.

• Voice Codec Support : u-law/a-law/ADPCM

• High RF RX Sensitivity of -98dBm @1.5V

• High RF TX Power of +8dBm @1.5V

• 96KB Embedded Flash Memory for Program Space.

• 8KB Data Memory

• Power Management Scheme with Deep Sleep Mode Support : under 1Ua

2) RF Transceiver

• Single-chip 2.4GHz RF Transceiver

• Low Power Consumption

• Low Operating Voltage of 1.5V

• High Sensitivity of -98dBm @1.5V

• No External T/R Switch and LPF needed

• On-chip VCO, LNA and PA

• Programmable Output Power up to +8dBm @1.5V

• Direct Sequence Spread Spectrum

• O-QPSK Modulation

• Scalable Data Rate : 250Kbps for ZigBee, 500Kbps and 1Mbps for private application.

• RSSI Measurement

• Compliant to IEEE802.15.4

3) Hardwired MAC

• Two 256byte circular FIFIs

• FIFO management

• AES-128 Engine

• CRC-16 Computation and check

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4) I8051-Compatible Microcontroller

• Max 12x Performance of standard 8051

• 96KB Embedded Flash Memory

• 8KB Data Memory

• 128-byte CPU dedicated Memory

• 1KB Boot ROM

• Dual DPTR Support

• Multi-Bank support for 96KB program memory(3 Banks)

• 12S/PCM interface with two 128-byte FIFOs

• u-law/a-law/ADPCM voice codec

• Two high-speed UARTs with two 16byte FIFOs(up to 1Mbps)

• 4 Timers/2PWMs

• Watchdog Timer

• Sleep Timer

• Quadrature signal decoder

• 22 General purpose I/O

• Internal RC oscillator for sleep timer

• On-chip power-on-reset

• 4Channel 8-bit ADC

• SPI Master/Slave interface

• ISP (In system programming)

• Temperature Sensor

5) Clock Inputs

• 16MHz Cristal for system clock

• 19.2MHz Cristal for system clock(optional)

• 32.768KHz Cristal for sleep timer(0ptional)