CMOSTEK CMT2157AW - User Manual

CMT2157AW
Rev 0.8 | Page 1/31
www.hoperf.com
CMT2157AW
240 – 960 MHz (G)FSK/OOK Stand-Alone Transmitter with Encoder
Copyright © By CMOSTEK
Features
 Embedded EEPROM
 Very Easy Development with RFPDK
 All Features Programmable
 Frequency Range: 240 to 960 MHz
 FSK, GFSK and OOK Modulation
 Symbol Rate:
 0.5 to 100 ksps (FSK/GFSK)
 0.5 to 40 ksps (OOK)
 Deviation: 1.0 to 200 kHz
 Output Power: -10 to +13 dBm
 Sleep Current: < 20 nA
 Stand-Alone, No External MCU Control Required
 Embedded 1920, 1527 and 2262 Data Encoder
 Up to 7 Configurable Data Pins for Push Buttons
 LED Indicator for Low Battery Detection and Transmission
 Sync ID Auto-Study with CMOSTEK Receiver
 FCC / ETSI Compliant
 RoHS Compliant
 14-pin SOP Package
Applications
 Low-Cost Consumer Electronics Applications
 Home and Building Automation
 Remote Fan Controllers
 Infrared Transmitter Replacements
 Industrial Monitoring and Controls
 Remote Lighting Control
 Wireless Alarm and Security Systems
 Remote Keyless Entry (RKE)
Descriptions
The CMT2157AW is a true single-chip, highly flexible, high
performance, (G)FSK/OOK RF transmitter with embedded
data encoder ideally for 240 to 960 MHz wireless
applications. The device integrates a data encoder that is
not only compatible with the most common used encoding
format of 1527 and 2262, but also a more efficient, flexible
and powerful format of 1920 designed by CMOSTEK. Up
to 7 configurable push buttons are supported in multiple
button modes. When pairing the device to CMOSTEK
receiver, the synchronization ID can be programmed into
both of the transmitter and receiver during the
manufacturing phase, or studied by the receiver from the
transmitter remotely by end customers. An embedded
EEPROM allows the RF and encoder parameters to be
programmed into the chip using the CMOSTEK USB
Programmer and the RFPDK. Alternatively, in stock
product of 868.35 MHz is available for immediate demands
without the need of EEPROM programming. The
CMT2157AW is part of the CMOSTEK NextGenRF
TM
family, together with CMT225x series receivers, they
enable ultra low cost, low power consumption RF links.
Ordering Information
Part Number Frequency Package MOQ
CMT2157AW-ESR 868.35 MHz T&R 2,500 pcs
CMT2157AW-ESB 868.35 MHz Tube 1,000 pcs
More Ordering Info: See Page 26
1
2
3
4
5
6
7
14
13
12
10
9
8
11
LED
VDD
GND
RFO
K7
K6
K5
XTAL
CLK
DATA
K1
K2
K3
K4
CMT2157AW
SOP14

Summary

Features

Key Capabilities

Embedded EEPROM, programmable features, modulation types, frequency range.

Performance Specifications

Output power, symbol rates, deviation, sleep current.

Integrated Functions

Data encoder, push buttons, LED indicator, auto-study.

Compliance and Package

FCC/ETSI, RoHS compliance, 14-pin SOP package.

Applications

Consumer and Automation

Consumer electronics, home automation, fan control, lighting.

Security and Control

Alarm systems, keyless entry, industrial controls.

Product Description and Ordering

CMT2157 AW Overview

Single-chip RF transmitter with embedded data encoder.

Summary of Ordering Options

Overview of part numbers, frequency, package, and MOQ.

Typical Application Schematics

CMT2157 AW Schematic Diagram

Illustrates the typical application circuit diagram.

Bill of Materials (BOM)

Lists components for typical application.

Abbreviations

Technical Abbreviations

Glossary of terms used in the datasheet.

Electrical Characteristics

Recommended Operating Conditions

Specifies voltage, temperature, and slew rate.

Absolute Maximum Ratings

Defines limits to prevent device damage.

Transmitter Specifications

Frequency and Modulation Specs

Covers frequency range, resolution, and modulation types.

Power and Current Specs

Details output power, current consumption, and sleep current.

Signal Quality Specs

Includes phase noise and harmonics.

Crystal Oscillator

Crystal Oscillator Specifications

Defines crystal frequency, tolerance, ESR, and load capacitance.

Pin Descriptions

Pin Assignments and Functions

Details pin numbers, names, I/O, and descriptions.

Typical Performance Characteristics

Phase Noise Plots

Graphical representation of phase noise.

Spectrum Analysis

Shows OOK and FSK/GFSK spectra.

Ramping and Power Output

Illustrates PA ramping and output power vs. voltage.

4.1 Low-Cost Application Schematic

Low-Cost Application Circuit

Presents a basic application circuit.

BOM for Low-Cost Application

Lists components for the low-cost circuit.

4.2 FCC;ETSI Compliant Application Schematic

FCC;ETSI Compliant Circuit

Shows a schematic meeting regulatory standards.

BOM for FCC;ETSI Compliant App

Lists components for compliant circuit.

Functional Descriptions

Overview

General introduction to the device's capabilities.

Modulation, Frequency, Deviation and Symbol Rate

Details modulation, frequency, deviation, and symbol rate.

Embedded EEPROM and RFPDK

Accessing Embedded EEPROM

Explains how to configure the chip via EEPROM.

Configurable Parameters in RFPDK

Lists parameters configurable via RFPDK.

Encoder Settings

Encoder Parameter Details

Covers deviation, PA ramping, and data representation.

Packet Configuration

Details bit format, packet count, and interval.

Button Mode Configuration

Explains button modes and push button settings.

Study Settings and Power Amplifier

Study Settings Parameters

Covers ID study, trigger time, and power settings.

Power Amplifier Function

Describes the integrated PA and its configuration.

PA Ramping

Explains PA ramping for minimizing spurs.

Working States

CMT2157 AW Working States

Details SLEEP, XO-STARTUP, TUNE, and TRANSMIT states.

The Encoder

Encoding Format Summary

Compares 1920, 1527, and 2262 formats.

1920 Packet Structure

Describes the 1920 packet format.

1920 Packet Details

1920 Normal and Study Packets

Details packet structures and bit format.

1527 Packet Structure

Covers the 1527 packet format and its parameters.

1527 Packet Details

1527 Normal and Study Packets

Explains 1527 packet structures and bit format.

2262 Packet Structure

Describes the 2262 packet format and its parameters.

2262 Packet Details

2262 Packet Structure and Bit Format

Details the 2262 packet structure and bit format.

ID Study

Explains the ID study function for device pairing.

Button Modes

Normal Button Mode

Details the normal button mapping and data transmission.

Matrix Button Mode

Matrix Button Mode Operation

Explains matrix button arrangement and data mapping.

Toggle and PWM Button Modes

Toggle Button Mode

Describes toggle button behavior for data bits.

PWM Button Mode

Explains PWM mode for duty ratio control.

LED Driving Capability and LBD

LED Driving Capability

Defines maximum current for the LED pin.

Low Battery Detection (LBD)

Describes the LBD threshold and LED indication.

Crystal Oscillator and RCLK

XTAL Circuitry and Crystal Model

Shows crystal circuitry and model.

RCLK Circuitry

Illustrates the RCLK input configuration.

6. Ordering Information

CMT2157 AW Part Number Details

Lists part numbers, package options, and MOQs.

Package Outline

14-Pin SOP Package Dimensions

Provides detailed dimensions for the SOP package.

Top Marking

CMT2157 AW Top Marking

Shows the marking on the device package.

Other Documentations

Related Documentation

Lists other relevant documents for CMT2157AW.

Document Change List

Document Revision History

Records changes made to the document.

Contact Information

Company Contact Details

Provides contact information for the manufacturer.

CMOSTEK CMT2157AW Specifications

General

Brand	CMOSTEK
Model	CMT2157AW
Category	Transmitter
Language	English