Computime CT EM2503 User Manual

CT-EM250 ZigBee-Ready RF Transceiver Modules

ZigBee- Ready SoC RF Transceiver Modules

Table of Content

General Description…………………………………………………………………………2

Applications…………………………………………………………………………………..2

Features………………………………………………………………………………………2

Absolute Maximum Ratings………………………………………………………………...3

Recommended Operating Conditions……………………………………………………..3

Electrical Specifications……………………………………………………………………..3

Introduction…………………………………………………………………………………...5

Typical Application Block…………………………………………………………………....5

Pin Assignment……………………………………………………………………………….6

Block Diagram………………………………………………………………………………..8

Circuit Description……………………………………………………………………………8

SIF Module Programming and Debug Interface………………………………………….9

Power Management…………………………………………………………………………9

RF Frequency, Output Power Levels and Data Rates…………………………………10

Antenna Design Considerations…………………………………………………………..11

PCB Layout Recommendations…………………………………………………………..13

FCC Approvals……………………………………………………………………………...13

FCC statement………………………………… ………………………………………….14

Operating description………………………………………………………………………14

Mechanical Dimensions……………………………………………………………………15

Ordering Information……………………………………………………………………….15

Document Revision History………………………………………………………………..15

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CT-EM250 ZigBee-Ready RF Transceiver Modules

ZigBee- Ready SoC RF Transceiver Modules

General Description

The CT-EM250 SoC RF Transceiver Modules is a compact surface mounted module
specially designed for Ember’s ZigBee™ protocol stack for wireless networks,
EmberZNet, based on IEEE 802.15.4 standard in the 2.4GHz world-wide ISM band. It
provides 16 channels and compliant PHY and MAC layers. The complete module is
only 20.32 x 25.52 x 3 mm（integrated antenna version）and 20.32 x 19.53 x 3 mm
(External Antenna version). They both integrate a 2.4GHz, IEEE 802.15.4-compliant
transceiver with a 16-bit XAP2b microprocessor. They consist of integrated Flash and
RAM memory and peripherals. A number of peripherals such as GPIO, UART, SPI,
I2C, ADC, and general purpose timers are integrated to support user-defined
applications.

Applications

Home
automation &
building control

Home
appliances &
alarms

Monitoring of
remote
systems

Security
systems
& lighting
controls

Sensor data
capture
in embedded
networks

Features

 Complete ZigBee-ready module with or without integrated antenna
 IEEE 802.15.4 compliant PHY and MAC layer
 12MHz XAP2b 16-bit microcontroller core
 128kB Flash and 5kB RAM, emulation EEPROM
 17 GPIO , 4 channel 12 bit ADC

2

 UART, SPI, I
 External 32.768 kHz real time clock or internal RC oscillator for timer
 High performance direct sequence spread spectrum (DSSS) RF transceiver
 16 channels in the 2.4 GHz ISM band
 on-chip regulator for 2.1-3.6V operation, two sleep low power modes

C and debug interfaces

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CT-EM250 ZigBee-Ready RF Transceiver Modules

Absolute Maximum Ratings

Parameter Test Conditions Min. Max. Unit

Regulator voltage (VDD_PADS)

Voltage on any GPIO[16:0], SIF_CLK,

SIF_MISO, SIF_MOSI, nSIF_LOAD, OSC32A,

OSC32B, nRESET,

Storage temperature

Under no circumstances should the absolute maximum ratings given above be violated. Stress

exceeding one or more of the limiting values may cause permanent damage to the device.

- 0.3 VDD_PADS+

- 0.3 3.6 V

V

0.3

- 40 + 140 °C

Recommended Operating Conditions

Parameter Test Conditions Min. Typ. Max. Unit

Regulator input voltage (VDD_PADS)

Core input voltage (VDD_24MHZ, VDD_VCO,

VDD_RF, VDD_IF, VDD_PADSA,

VDD_FLASH, VDD_PRE, VDD_SYNTH,

VDD_CORE)

Temperature range

1.7 1.8 1.9 V

2.1

- 40

3.6 V

+ 85 °C

Electrical Specifications

T=25　℃, VCC = 3.0V, fo=2450Mhz, if nothing else stated.

Parameter Min. Typ. Max Unit Condition / Note

Operating frequency 2405 2480 M Programmable in 5 MHz steps for

IEEE 802.15.4 compliance

Number of channels 16 For IEEE 802.15.4 compliance

Channel spacing 5 MHz For IEEE 802.15.4 compliance

Input/output impedance 50 Ohm

Data rate 250 kbit/s

DSSS chip rate 2 Mc/s

Frequency stability +/-40 ppm

Transmit power -32 5 dBm Programmable from firmware

Harmonics

2nd harmonic TBD dBm

3rd harmonic TBD dBm

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CT-EM250 ZigBee-Ready RF Transceiver Modules

Parameter Min. Typ. Max Unit Condition / Note

Spurious emission,

TX 30 – 1000 MHz

1-12.75 GHz TBD

1.8-1.9 GHz TBD

5.15-5.3 GHz TBD

Sensitivity -98 dBm PER = 1% Boost Mode

Complies with EN 300 328, EN

TBD dBm

300 440, FCC CRF47 Part 15

and ARIB STD-T66

Adjacent channel rejection

+/-5 MHz

Adjacent channel rejection

+/-10 MHz

Co-channel rejection

Spurious emission,

RX 30 -1000 MHz

1-12.75 GHz TBD

Supply voltage 2.1 3.6 V

Current consumption, RX 36 mA Max RX sensitivity (boost mode)

Current consumption, TX 36 mA At max. TX power

Quiescent current,

Mode1

Quiescent current,

Mode2

Flash memory 128 KB

35/35

40/40

-6

1.0 μA including internal RC

1.5 μA including 32.768k

TBD

dB

dB

dB

dBm

IEEE 802.15.4 signal at - 82dBm

IEEE 802.15.4 signal at - 82dBm

IEEE 802.15.4 signal at - 82dBm

Complies with EN 300 328, EN

300 440, FCC CRF47 Part 15

and ARIB STD-T66

(+ 5dBm boost)

oscillator

oscillator

RAM memory 5 kB

Simulated EEPROM

memory

MCU clock frequency 12 MHz

RC OSCILATOR

FREQUENCY

MCU low frequency

crystal

8 kB

10 KHZ

32.768 kHz

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CT-EM250 ZigBee-Ready RF Transceiver Modules

Introduction

The CT-EM250 series of modules are specially designed for ZigBee application. They
provide a fast jump start design for system integrators or electronic designers wishing
to use ZigBee wireless technologies. The module contains qualified RF hardware and
enough processor power to run the EmberZNet stack or other ZigBee network stack
(depending on version), making it a powerful platform for building wireless networking
products. ZigBee Coordinators (ZC), ZigBee Routers (ZR), and ZigBee End Devices
(ZED) are all supported and are programmed onto the module together with a custom
application. Minimal RF design experience is need to use CT-EM250 modules.

Typical application block

GPIO PIN

MCU or/and
Peripheral
Equipment

VDD_PADS=2.1—3.6V

SIF PIN

Debug and

programming

interface

SIF PIN

CT-EM2500

RF Module

Hum.
sensor

Figure 1 Example of application block

Temp.
sensor

4 General A/D pin

Pin Assignment

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