CMOSTEK CMT2157A Manual de usuario

CMT2157A

Rev 0.8 | Page 1/31

www.cmostek.com

CMT2157A

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

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 CMT2157A 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

CMT2157A is part of the CMOSTEK NextGenRFTM family,

together with CMT225x series receivers, they enable ultra

low cost, low power consumption RF links.

Ordering Information

Part Number Frequency Package MOQ

CMT2157A-ESR 868.35 MHz T&R 2,500 pcs

CMT2157A-ESB 868.35 MHz Tube 1,000 pcs

More Ordering Info: See Page 26

LED

VDD

GND

RFO

XTAL

CLK

DATA

CMT2157A

SOP14

CMT2157A

Rev 0.8 | Page 2/31

www.cmostek.com

Typical Application

ANT VDD

L2 C1

L1 C0

SW7

SW6

SW5

LED

VDD

GND

RFO

SW4

SW3

SW2

SW1

XTAL

CLK

DATA

CLK

DATA

CLK

DATA

VDD

CMT2157A

Note: Connector J1 is for

EEPROM Programming

Figure 1. CMT2157A Typical Application Schematic

Table 1. BOM of 433.92/868.35 MHz Typical Application

Designator Descriptions Value

Unit Manufacturer

433.92 MHz

868.35 MHz

U1 CMT2157A, 240 – 960 MHz (G)FSK/OOK

stand-alone transmitter with encoder

- - CMOSTEK

X1 ±20 ppm, SMD32*25 mm crystal 26 MHz EPSON

C0 ±20%, 0402 X7R, 25 V 0.1 uF Murata GRM15

C1 ±5%, 0402 NP0, 50 V 82 82 pF Murata GRM15

C2 ±5%, 0402 NP0, 50 V 9.1 3.9 pF Murata GRM15

L1 ±5%, 0603 multi-layer chip inductor 180 100 nH Murata LQG18

L2 ±5%, 0603 multi-layer chip inductor 22 5.1 nH Murata LQG18

D1 D0603, red LED - - -

SW[7:1] Push buttons - - -

CMT2157A

Rev 0.8 | Page 3/31

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Abbreviations

Abbreviations used in this data sheet are described below

AN Application Notes OBW Occupied Bandwidth

BOM

Bill of Materials

OOK

On-Off Keying

BSC Basic Spacing between Centers PA Power Amplifier

Bandwidth

Personal Computer

DC Direct Current PCB Printed Circuit Board

EEPROM Electrically Erasable Programmable Read-Only

Memory

PLL

Phase Lock Loop

PN Phase Noise

ESD

Electro-Static Discharge

RBW

Resolution Bandwidth

ESR Equivalent Series Resistance RCLK Reference Clock

FSK

Frequency Shift Keying

Radio Frequency

GFSK Gauss Frequency Shift Keying RFPDK RF Product Development Kit

GUI

Graphical User Interface

RoHS

Restriction of Hazardous Substances

IC Integrated Circuit Rx Receiving, Receiver

LDO

Low Drop-Out

SOT

Small-Outline Transistor

Max Maximum TBD To Be Determined

MCU

Microcontroller Unit

Transmission, Transmitter

Min Minimum Typ Typical

MOQ

Minimum Order Quantity

XO/XOSC

Crystal Oscillator

NP0 Negative-Positive-Zero XTAL Crystal

CMT2157A

Rev 0.8 | Page 4/31

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Table of Contents

1. Electrical Characteristics............................................................................................................................................ 5

1.1 Recommended Operating Conditions...................................................................................................................5

1.2 Absolute Maximum Ratings...................................................................................................................................5

1.3 Transmitter Specifications.....................................................................................................................................6

1.4 Crystal Oscillator................................................................................................................................................... 7

2. Pin Descriptions.......................................................................................................................................................... 8

3. Typical Performance Characteristics......................................................................................................................... 9

4. Typical Application Schematics............................................................................................................................... 10

4.1 Low-Cost Application Schematic......................................................................................................................... 10

4.2 FCC/ETSI Compliant Application Schematic....................................................................................................... 11

5. Functional Descriptions............................................................................................................................................ 12

5.1 Overview............................................................................................................................................................. 12

5.2 Modulation, Frequency, Deviation and Symbol Rate .......................................................................................... 12

5.3 Embedded EEPROM and RFPDK...................................................................................................................... 13

5.4 Power Amplifier................................................................................................................................................... 15

5.5 PA Ramping........................................................................................................................................................ 15

5.6 Working States.................................................................................................................................................... 16

5.7 The Encoder........................................................................................................................................................ 17

5.7.1 1920 Packet Structure............................................................................................................................................17

5.7.2 1527 Packet Structure............................................................................................................................................18

5.7.32262 Packet Structure............................................................................................................................................19

5.8 ID Study.............................................................................................................................................................. 20

5.9 Button Modes...................................................................................................................................................... 21

5.9.1 Normal......................................................................................................................................................................21

5.9.2 Matrix........................................................................................................................................................................22

5.9.3 Toggle.......................................................................................................................................................................23

5.9.4 PWM.........................................................................................................................................................................23

5.10 LED Driving Capability........................................................................................................................................ 24

5.11 Low Battery Detection (LBD)............................................................................................................................... 24

5.12 Crystal Oscillator and RCLK................................................................................................................................ 24

6. Ordering Information................................................................................................................................................. 26

7. Package Outline......................................................................................................................................................... 27

8. Top Marking ............................................................................................................................................................... 28

8.1 CMT2157A Top Marking..................................................................................................................................... 28

9. Other Documentations.............................................................................................................................................. 29

10.Document Change List.............................................................................................................................................. 30

11. Contact Information .................................................................................................................................................. 31

CMT2157A

Rev 0.8 | Page 5/31

www.cmostek.com

1. Electrical Characteristics

VDD = 3.3 V, TOP = 25 ℃, FRF = 433.92 MHz, output power is +10 dBm terminated in a matched 50 Ω impedance, unless

otherwise noted.

1.1 Recommended Operating Conditions

Table 2. Recommended Operation Conditions

Parameter Symbol Conditions Min Typ Max Unit

Operation Voltage Supply VDD

1.8 3.6 V

Operation Temperature TOP

-40 85 ℃

Supply Voltage Slew Rate 1mV/us

1.2 Absolute Maximum Ratings

Table 3. Absolute Maximum Ratings[1]

Parameter Symbol Conditions Min Max Unit

Supply Voltage VDD

-0.3 3.6 V

Interface Voltage VIN

-0.3 VDD + 0.3 V

Junction Temperature TJ-40 125 ℃

Storage Temperature TSTG

-50 150 ℃

Soldering Temperature TSDR Lasts at least 30 seconds 255 ℃

ESD Rating Human Body Model (HBM) -2 2 kV

Latch-up Current @ 85 ℃-100 100 mA

Note:

[1]. Stresses above those listed as “absolute maximum ratings” may cause permanent damage to the device. This is a stress

rating only and functional operation of the device under these conditions is not implied. Exposure to maximum rating

conditions for extended periods may affect device reliability.

Caution! ESD sensitive device. Precaution should be used when handling the device in order

to prevent permanent damage.

CMT2157A

Rev 0.8 | Page 6/31

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1.3 Transmitter Specifications

Table 4. Transmitter Specifications

Parameter Symbol Conditions Min Typ Max Unit

Frequency Range[1] FRF 240 960MHz

Synthesizer Frequency

Resolution FRES FRF ≤480 MHz 198 Hz

FRF > 480 MHz 397 Hz

Symbol Rate SR FSK/GFSK 0.5 100 ksps

OOK 0.5 40 ksps

(G)FSK Modulation

Deviation Range FDEV 1 200 kHz

Bandwidth-Time Product BT GFSK modulation - 0.5 - -

Maximum Output Power POUT(Max) +13 dBm

Minimum Output Power POUT(Min) -10 dBm

Output Power Step Size PSTEP

1dB

PA Ramping Time[2] tRAMP

01024 us

Current Consumption[3]

@ 433.92 MHz IDD-433.92

OOK, 0 dBm 6 mA

OOK, +10 dBm 8.5 mA

OOK, +13 dBm 10.2 mA

FSK, 0 dBm 10.8 mA

FSK, +10 dBm 23.8 mA

FSK, +13 dBm 32 mA

Current Consumption[3]

@ 868.35 MHz IDD-868.35

OOK, 0 dBm 6.1 mA

OOK, +10 dBm 9.3 mA

OOK, +13 dBm 11.2 mA

FSK, 0 dBm 12.3 mA

FSK, +10 dBm 26.7 mA

FSK, +13 dBm 35.3 mA

Sleep Current ISLEEP 20 nA

Frequency Tune Time tTUNE

370 us

Phase Noise @ 433.92

MHz PN433.92

100 kHz offset from FRF -80 dBc/Hz

600 kHz offset from FRF

-96

dBc/Hz

1.2 MHz offset from FRF -108dBc/Hz

Phase Noise @ 868.35

MHz PN868.35

100 kHz offset from FRF -74 dBc/Hz

600 kHz offset from FRF -90 dBc/Hz

1.2 MHz offset from FRF -102 dBc/Hz

Harmonics Output for

433.92 MHz[4] H2433.92 2nd harm @ 867.84 MHz, +13 dBm POUT -52 dBm

H3433.92

3rd harm @ 1301.76 MHz, +13 dBm POUT -57 dBm

Harmonics Output for

868.35 MHz[4] H2868.35 2nd harm @ 1736.7 MHz, +13 dBm POUT -68 dBm

H3868.35 3rd harm @ 2605.05 MHz, +13 dBm POUT -52 dBm

OOK Extinction Ration 60 dB

Notes:

[1]. The frequency range is continuous over the specified range.

[2]. 0 and 2nus, n = 0 to 10, when set to “0”, the PA output power will ramp to its configured value in the shortest possible

time.

[3]. The working currents are tested with: 1527 packet format/Normal button mode/ 4 push buttons/Sync ID = 0/No LED.

[4]. The harmonics output is measured with the application shown as Figure 10.

CMT2157A

Rev 0.8 | Page 7/31

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1.4 Crystal Oscillator

Table 5. Crystal Oscillator Specifications

Parameter Symbol Conditions Min Typ Max Unit

Crystal Frequency[1] FXTAL 26 26 26 MHz

Crystal Tolerance[2] ±20 ppm

Load Capacitance[3] CLOAD

20 pF

Crystal ESR Rm 60 Ω

XTAL Startup Time[4] tXTAL 400 us

Notes:

[1]. The CMT2157A 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.

The acceptable crystal tolerance depends on RF frequency and channel spacing/bandwidth.

[3]. The required crystal load capacitance is integrated on-chip to minimize the number of external components.

[4]. This parameter is to a large degree crystal dependent.

CMT2157A

Rev 0.8 | Page 8/31

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2. Pin Descriptions

LED

VDD

GND

RFO

XTAL

CLK

DATA

Figure 2. CMT2157A Pin Assignments

Table 6. CMT2157A Pin Descriptions

Pin Number Name I/O Descriptions

1 LED O LED driver, active low

2 VDD I Power supply input

3 GND I Ground

4 RFO O Power amplifier output

5 - 11 K[7:1] I Push button 7 to 1

12 DATA IO Data pin to access the embedded EEPROM, internally pulled up to VDD

13 CLK I Clock pin to access the embedded EEPROM, internally pulled up to VDD

14 XTAL I 26 MHz single-ended crystal oscillator input or

External 26 MHz reference clock input

CMT2157A

Rev 0.8 | Page 9/31

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3. Typical Performance Characteristics

13.4dBm

@ 433.92 MHz

-56.8 dBm

@ 435.12 MHz

-60

-50

-40

-30

-20

-10

432.42 432.72 433.02 433.32 433.62 433.92 434.22 434.52 434.82 435.12 435.42

Power(dBm)

Frequency (MHz)

Phase Noise @ 433.92 MHz

13.0 dBm

@ 868.35 MHz

-55.9 dBm

@ 869.55 MHz

-65

-55

-45

-35

-25

-15

-5

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

Power(dBm)

Frequency (MHz)

Phase Noise @ 868.35 MHz

-60

-50

-40

-30

-20

-10

432.92 433.12 433.32 433.52 433.72 433.92 434.12 434.32 434.52 434.72 434.92

Power(dBm)

Frequency (MHz)

OOK Spectrum

-50

-40

-30

-20

-10

433.62 433.72 433.82 433.92 434.02 434.12 434.22

Power (dBm)

Frequency (MHz)

FSK vs. GFSK

FSK

GFSK

-50

-40

-30

-20

-10

433.17 433.37 433.57 433.77 433.97 434.17 434.37 434.57

Power (dBm)

Frequency (MHz)

Spectrum of Various PA Ramping Options

1024 us

512 us

256 us

128 us

64 us

32 us

SR= 1.2ksps

-2

1.6 1.8 22.2 2.4 2.6 2.8 33.2 3.4 3.6 3.8

Power(dBm)

SupplyVoltage (V)

POUT vs. VDD

13dBm

10dBm

0dBm

Figure 3. Phase Noise, FRF = 868.35 MHz,

POUT = +13 dBm, RBW = 10 kHz, Un-encoded

Figure 5. OOK Spectrum,

POUT = +10 dBm, tRAMP = 32 us

Figure 6. FSK/GFSK Spectrum,

SR = 9.6 ksps, FDEV = 15 kHz

Figure 7. Spectrum of PA Ramping,

SR = 1.2 ksps, POUT = +10 dBm

Figure 4. Phase Noise, FRF = 433.92 MHz,

POUT = +13 dBm, RBW = 10 kHz, Un-encoded

Figure 8. Output Power vs. Supply

Voltages, FRF = 433.92 MHz

CMT2157A

Rev 0.8 | Page 10/31

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4. Typical Application Schematics

4.1 Low-Cost Application Schematic

ANT VDD

L2 C1

L1 C0

SW7

SW6

SW5

LED

VDD

GND

RFO

SW4

SW3

SW2

SW1

XTAL

CLK

DATA

CLK

DATA

CLK

DATA

VDD

CMT2157A

Note: Connector J1 is for

EEPROM Programming

Figure 9. Low-Cost Application Schematic

Notes:

1. Connector J1 is a must for the CMT2157A EEPROM access during development or manufacture phase.

2. The general layout guidelines are listed below. For more design details, please refer to “AN111 CMT215x Schematic and

PCB Layout Design Guideline”

Use as much continuous ground plane metallization as possible.

Use as many grounding vias (especially near to the GND pins) as possible to minimize series parasitic inductance

between the ground pour and the GND pins.

Avoid using long and/or thin transmission lines to connect the components.

Avoid placing the nearby inductors in the same orientation to reduce the coupling between them.

Place C0 as close to the CMT2157A as possible for better filtering.

3. The table below shows the BOM of 433.92/868.35 MHz Low-Cost Application. For the BOM of more applications, please

refer to “AN111 CMT215x Schematic and PCB Layout Design Guideline”.

Table 7. BOM of 433.92/868.35 MHz Low-Cost Application

Designator Descriptions Value

Unit Manufacturer

433.92 MHz

868.35 MHz

U1 CMT2157A, 240 – 960 MHz (G)FSK/OOK

stand-alone transmitter with encoder - - CMOSTEK

X1 ±20 ppm, SMD32*25 mm crystal 26 MHz EPSON

C0 ±20%, 0402 X7R, 25 V 0.1 uF Murata GRM15

C1 ±5%, 0402 NP0, 50 V 82 82 pF Murata GRM15

C2 ±5%, 0402 NP0, 50 V 9.1 3.9 pF Murata GRM15

L1 ±5%, 0603 multi-layer chip inductor 180 100 nH Murata LQG18

L2 ±5%, 0603 multi-layer chip inductor 22 5.1 nH Murata LQG18

D1 D0603, red LED - - -

SW[7:1] Push buttons - - -

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