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240 – 960 MHz (G)FSK/OOK Stand-Alone Transmitter with Encoder
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
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
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
family, together with CMT225x series receivers, they
enable ultra low cost, low power consumption RF links.
Copyright © By CMOSTEK
and
receiver
during
the
TM
Rev 0.8 | Page 1/31
CMT2157AW
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)
Ordering Information
Part Number
Frequency
CMT2157AW-ESR
868.35 MHz
CMT2157AW-ESB
868.35 MHz
More Ordering Info: See
Page 26
SOP14
1
LED
2
VDD
3
GND
4
RFO
5
K7
6
K6
7
K5
CMT2157AW
CMT2157AW
Package
MOQ
T&R
2,500 pcs
Tube
1,000 pcs
14
XTAL
13
CLK
12
DATA
11
K1
10
K2
9
K3
8
K4
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Table of Contents
Related Manuals for CMOSTEK CMT2157AW
Summary of Contents for CMOSTEK CMT2157AW
- Page 1 RoHS Compliant 14-pin SOP Package 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...
- Page 2 CMT2157AW Typical Application CMT2157AW XTAL DATA DATA DATA Note: Connector J1 is for EEPROM Programming Figure 1. CMT2157AW Typical Application Schematic Table 1. BOM of 433.92/868.35 MHz Typical Application Value Unit Manufacturer Designator Descriptions 433.92 MHz 868.35 MHz CMT2157AW, 240 – 960 MHz (G)FSK/OOK...
- Page 3 CMT2157AW Abbreviations Abbreviations used in this data sheet are described below Application Notes Occupied Bandwidth Bill of Materials On-Off Keying Basic Spacing between Centers Power Amplifier Bandwidth Personal Computer Direct Current Printed Circuit Board EEPROM Electrically Erasable Programmable Read-Only Phase Lock Loop...
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Page 4: Table Of Contents
5.12 Crystal Oscillator and RCLK ..........................24 6. Ordering Information ..............................26 7. Package Outline ................................. 27 8. Top Marking ................................28 8.1 CMT2157AW Top Marking ..........................28 9. Other Documentations .............................. 29 10. Document Change List .............................. 30 11. Contact Information ..............................31 Rev 0.8 | Page 4/31... -
Page 5: Electrical Characteristics
CMT2157AW Electrical Characteristics = 433.92 MHz, output power is +10 dBm terminated in a matched 50 Ω impedance, unless ℃ = 3.3 V, T = 25 otherwise noted. 1.1 Recommended Operating Conditions Table 2. Recommended Operation Conditions Parameter Symbol Conditions... -
Page 6: Transmitter Specifications
CMT2157AW 1.3 Transmitter Specifications Table 4. Transmitter Specifications Parameter Symbol Conditions Unit Frequency Range ≤ 480 MHz Synthesizer Frequency Resolution > 480 MHz FSK/GFSK ksps Symbol Rate ksps (G)FSK Modulation Deviation Range Bandwidth-Time Product GFSK modulation Maximum Output Power OUT(Max) -
Page 7: Crystal Oscillator
XTAL Notes: [1]. The CMT2157AW can directly work with external 26 MHz reference clock input to XTAL pin (a coupling capacitor is required) with amplitude 0.3 to 0.7 Vpp. [2]. This is the total tolerance including (1) initial tolerance, (2) crystal loading, (3) aging, and (4) temperature dependence. -
Page 8: Pin Descriptions
CMT2157AW 2. Pin Descriptions XTAL DATA Figure 2. CMT2157AW Pin Assignments Table 6. CMT2157AW Pin Descriptions Pin Number Name Descriptions LED driver, active low Power supply input Ground Power amplifier output 5 - 11 K[7:1] Push button 7 to 1... -
Page 9: Typical Performance Characteristics
CMT2157AW 3. Typical Performance Characteristics Phase Noise @ 868.35 MHz Phase Noise @ 433.92 MHz 13.0 dBm @ 868.35 MHz 13.4dBm @ 433.92 MHz -55.9 dBm @ 869.55 MHz -56.8 dBm @ 435.12 MHz 432.42 432.72 433.02 433.32 433.62 433.92 434.22 434.52 434.82 435.12 435.42 866.85 867.1 867.35 867.6 867.85 868.1 868.35 868.6 868.85 869.1 869.35 869.6 869.85... -
Page 10: Typical Application Schematics
Figure 9. Low-Cost Application Schematic Notes: Connector J1 is a must for the CMT2157AW EEPROM access during development or manufacture phase. The general layout guidelines are listed below. For more design details, please refer to “AN111 CMT215x Schematic and PCB Layout Design Guideline”... -
Page 11: Fcc/Etsi Compliant Application Schematic
Figure 10. FCC/ETSI Compliant Application Schematic Notes: Connector J1 is a must for the CMT2157AW EEPROM access during development or manufacture phase. The general layout guidelines are listed below. For more design details, please refer to “AN111 CMT215x Schematic and PCB Layout Design Guideline”. -
Page 12: Functional Descriptions
Alternatively, in stock product of 868.35 MHz is available for immediate demands with no need of EEPROM programming. The CMT2157AW operates from 1.8 to 3.6 V so that it can finely work with most batteries to their useful power limits. It only consumes 26.7 mA when transmitting +10 dBm FSK signal at 868.35 MHz under 3.3 V supply voltage. -
Page 13: Embedded Eeprom And Rfpdk
The RFPDK (RF Products Development Kit) is a very user-friendly software tool delivered for the user configuring the CMT2157AW in the most intuitional way. The user only needs to fill in/select the proper value of each parameter and click the “Burn”... - Page 14 CMT2157AW Category Parameters Descriptions Default Mode The FSK frequency deviation. The range is from Basic Deviation 35 kHz 1 to 200 kHz. Advanced To control PA output power ramp up/down time, PA Ramping 0 us Advanced options are 0 and 2 us (n from 0 to 10).
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Page 15: Power Amplifier
“0”, the PA output power will ramp up to its configured value in the shortest possible time. The ramp down time is identical to the ramp up time in the same configuration. CMOSTEK recommends that the maximum symbol rate should be no higher than 1/2 of the PA ramping “rate”, as shown in the formula below: ≤... -
Page 16: Working States
SLEEP state. All the details of push button(s) function and periodic transmission can be referred to “AN142 CMT2157A Configuration Guideline”. SLEEP When the CMT2157AW is in the SLEEP state, all the internal blocks are turned off and the current consumption is minimized to 20 nA typically. XO-STARTUP Once the CMT2157AW received the valid control signal, it will go into the XO-STARTUP state, and the internal XO starts to work. -
Page 17: The Encoder
Normal Packet The normal packet is used to control the data pins of the CMOSTEK receiver CMT2250AW or PWM output of the CMT2251AW. It contains a 16-symbol Preamble, a 32-symbol Head_N (which indicates that the current packet is a normal packet rather than a study packet), a Sync ID, a Configurable Data Field and an 8-symbol CRC. -
Page 18: 1527 Packet Structure
Study Packet The study packet is used for the receiver to learn the Sync ID from the CMT2157AW in order to pair the two devices. It contains an optional Preamble, a 32-symbol Head_S, a Sync ID and an 8-symbol CRC. -
Page 19: 2262 Packet Structure
In the traditional 2262 format, 4 OSC clocks (1 OSC clock cycle is notated as 1 α) are equal to 1 symbol. By using the CMOSTEK products, the user does not need to adjust the OSC to define the symbol rate, because the symbol rate is directly programmed. -
Page 20: Id Study
The lengths of the Sync ID are different in the different packet formats. In 1920 format, it is from 1 to 32 bits. In 1527 format, it is fixed at 20 bits. The ID Study is initialized by the CMT2157AW. It is done by executing the following steps. An example of CMT2157AW paring with CMT2250/51AW is given below. -
Page 21: Button Modes
5.9 Button Modes The button modes define the functions of the input pins K1 – K7. The CMT2157AW supports 4 different button modes: Normal, Matrix, Toggle and PWM, which are configured on the RFPDK. The following sections give the abstract of each button mode. -
Page 22: Matrix
CMT2157AW 5.9.2 Matrix The Matrix Button Mode is supported in 1920 and 1527 format. In the Matrix Button Mode, the number of buttons is fixed at 5. On the RFPDK, it can be seen that the 5 buttons are assigned to pin 11 (K1) – pin 7 (K5). In this mode, at most two buttons can be pressed at the same time. -
Page 23: Toggle
CMT2157AW 5.9.3 Toggle The Toggle Button Mode is supported in 1920 and 1527. In this mode, 5 or 6 buttons are used. Four buttons directly mapped to the data D0 – D3 are used to control the data. Besides, a single button or two separated buttons used to turn on/off the data can be chosen by the parameter “On/Off Button(s)”. -
Page 24: Led Driving Capability
5.12 Crystal Oscillator and RCLK The CMT2157AW uses a 1-pin crystal oscillator circuit with the required crystal load capacitance integrated on-chip. Figure 27 shows the configuration of the XTAL circuitry and the crystal model. The recommended specification for the crystal is 26 MHz with ±20 ppm, ESR (Rm) <... - Page 25 Figure 27. XTAL Circuitry and Crystal Model If a 26 MHz RCLK (reference clock) is available in the system, the user can directly use it to drive the CMT2157AW by feeding the clock into the chip via the XTAL pin. This further saves the system cost due to the removal of the crystal. A coupling capacitor is required if the RCLK is used.
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Page 26: Ordering Information
“R” stands for the tape and reel package option, the minimum order quantity (MOQ) for this option is 2,500 pcs. “B” stands for the tube package option, with the MOQ of 1,000 pcs. The default frequency for CMT2157AW is 868.35 MHz, for the other settings, please refer to the Table 10 of Page 13. Visit www.cmostek.com/products... -
Page 27: Package Outline
CMT2157AW 7. Package Outline A2 A 0.25 θ Figure 29. 14-Pin SOP Package Table 20. 14-Pin SOP Package Dimensions Size (millimeters) Symbol 1.75 0.05 0.225 1.30 1.40 1.50 0.60 0.65 0.70 0.39 0.48 0.21 0.26 8.45 8.65 8.85 5.80 6.00 6.20... -
Page 28: Top Marking
C M T 2 1 5 7 A ① ② ③ ④ ⑤ ⑥ Y Y W W Figure 30. CMT2157AW Top Marking Table 21. CMT2157AW Top Marking Explanation Mark Method : Laser Pin 1 Mark : Circle’s diameter = 1 mm Font Size : 0.35 mm, right-justified... -
Page 29: Other Documentations
RF matching network and other application Design Guideline layout design related issues. AN142 CMT2157A Configuration Guideline Details of configuring CMT2157AW features on the RFPDK. User’s Guides for CMT2157AW/2250(1)AW Development CMT2157A/2250(1)A One-Way RF Link AN113 Kits, including Evaluation Board and Evaluation Module, Development Kits User’s Guide... -
Page 30: Document Change List
CMT2157AW 10. Document Change List Table 23. Document Change List Rev. No. Chapter Description of Changes Date Initial released version 2015-02-11 Rev 0.8 | Page 30/31 www.hoperf.com... -
Page 31: Contact Information
The material contained herein is the exclusive property of CMOSTEK and shall not be distributed, reproduced, or disclosed in whole or in part without prior written permission of CMOSTEK. CMOSTEK products are not authorized for use as critical components in life support devices or systems without express written approval of CMOSTEK.
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