CMT2119AW IET | Alldatasheet
Document overview
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Technical content
Features
Optional Chip Feature Configuration Schemes On-Line Registers Configuration Off-Line EEPROM Programming Frequency Range: 240 to 960 MHz FSK, GFSK and OOK Modulation Symbol Rate: 0.5 to 100 ksps (FSK/GFSK) 0.5 to 30 ksps (OOK) Deviation: 1.0 to 200 kHz Two-wire Interface for Registers Accessing and EEPROM Programming Output Power: -10 to +13 dBm Supply Voltage: 1.8 to 3.6 V Sleep Current: < 20 nA FCC/ETSI Compliant RoHS Compliant 6-pin SOT23-6 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 CMT2119AW is a high performance, highly flexible, low-cost, single- chip (G)FSK/OOK transmitter for various 240 to 960 MHz wireless applications. It is a part of the CMOSTEK NextGenRFTM family, which includes a complete line of transmitters, receivers and transceivers. The CMT2119AW provides the simplest way to control the data transmission. The transmission is started when an effective level turnover is detect ed on the DATA pin, while t he transmission action will stop after the DATA pin holding level low for a defined time window , or after a two- wire interface (TWI) command is issued. The chip features can be configured in two di fferent ways: setting the configuration registers through t he TWI, or programming the embedded EEPROM with CMOSTEK USB Programmer and the RFPDK. The device operates from a supply voltage of 1.8 V to 3.6 V, consumes 27.6 mA (FSK @ 868.35 MHz) when transmitting +10 dBm output power, and only leak 20 nA when it is in sleep state. The CMT2119AW transmitter together with the CMT2219AW receiver enables a robust RF link. SOT23-6
Ordering Information
Part Number Frequency Package MOQ CMT2119AW-ESR 868.35 MHz SOT23-6 3,000 pcs More Ordering Info: See Page 24 3 4 6XTAL GND DATA CLK RFO VDD CMT2119AW
Figure 1. CMT2119AW Typical Application Schematic Table 1. BOM of 433.92/868.35 MHz Low-Cost Application
Rev 0.9 | Page 3/29 www.hoperf.com Abbreviations Abbreviations used in this data sheet are described below BOM Bill of Materials PC Personal Computer BSC Basic Spacing between Centers PCB Printed Circuit Board EEPROM Electrically Erasable Programmable Read-Only Memory PN Phase Noise RCLK Reference Clock ESD ESR Electro-Static Discharge Equivalent Series Resistance RF Radio Frequency RFPDK RF Product Development Kit ETSI European Telecommunications Standards Institute RoHS Restriction of Hazardous Substances Rx Receiving, Receiver FCC Federal Communications Commission SOT Small-Outline Transistor FSK Frequency Shift Keying SR Symbol Rate GFSK Gauss Frequency Shift Keying TWI Two-wire Interface Max Maximum Tx Transmission, Transmitter MCU Microcontroller Unit Typ Typical Min Minimum USB Universal Serial Bus MOQ Minimum Order Quantity XO/XOSC Crystal Oscillator NP0 Negative-Positive-Zero XTAL Crystal OBW Occupied Bandwidth PA Power Amplifier OOK On-Off Keying
Rev 0.9 | Page 4/29 www.hoperf.com Table of Contents
- Electrical Characteristics
impedance, unless otherwise noted.
1.1 Recommended Operating Conditions
Table 2. Recommended Operation Conditions
1.2 Absolute Maximum Ratings
Table 3. Absolute Maximum Ratings[1] conditions for extended periods may affect device reliability. to prevent permanent damage.
1.3 Transmitter Specifications
Table 4. Transmitter Specifications
1.2 MHz offset from FRF -107 dBc/Hz
1.2 MHz offset from FRF -101 dBc/Hz
433.92 MHz
868.35 MHz
[1]. The frequency range is continuous over the specified range. [3]. The harmonics output is measured with the application shown as Figure 10.
1.4 Crystal Oscillator
Table 5. Crystal Oscillator Specifications 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.
Figure 2. CMT2119AW Pin Assignments Table 6. CMT2119AW Pin Descriptions
1 XTAL I 26 MHz single-ended crystal oscillator input or
2 GND I Ground
3 DATA IO
4 CLK I
5 RFO O Power amplifier output
6 VDD I Power supply input
- Typical Application Schematics
4.1 Low-Cost Application Schematic
Figure 9. Low-Cost Application Schematic
- Connector J1 is a must for the CMT2119AW EEPROM access during development or manufacture.
- An external MCU U2 is necessary if on-line register configuration is required.
- The general layout guidelines are listed below. For more design details, please refer to “AN101 CMT211xA Schematic and
Use as much continuous ground plane metallization as possible. 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 CMT2119AW as possible for better filtering.
- The table below shows the BOM of 433.92/868.35 MHz Low-Cost Applications. For the BOM of 315/915 MHz application,
please refer to “AN101 CMT211xA Schematic and PCB Layout Design Guideline”. Table 7. BOM of 433.92/868.35 MHz Low-Cost Application
4.2 FCC/ETSI Compliant Application Schematic
Figure 10. FCC/ETSI Compliant Application Schematic
- Connector J1 is a must for the CMT2119AW EEPROM access during development or manufacture.
- An external MCU U2 is necessary if on-line register configuration is required.
- The general layout guidelines are listed below. For more design details, please refer to “AN101 CMT211xA Schematic and
PCB Layout Design Guideline”. Use as much continuous ground plane metallization as possible. 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 CMT2119AW as possible for better filtering.
- The table below shows the BOM of 433.92/868.35 MHz FCC/ETSI Compliant Application. For the BOM of 315 and 915
MHz application, please refer to “AN101 CMT211xA Schematic and PCB Layout Design Guideline”. Table 8. BOM of 433.92/868.35 MHz FCC/ETSI Compliant Application
Figure 11. CMT2119AW Functional Block Diagram
5.1 Overview
with its highly integrated and low power design. oscillator circuit with the required crystal load capacitance integrated on-chip to minimize the number of external components.
5.2 Modulation, Frequency, Deviation and Symbol Rate
when the frequency is larger than 480 MHz. See the table below for the modulation, frequency and symbol rate specifications. Table 9. Modulation, Frequency and Symbol Rate
5.3 Embedded EEPROM and RFPDK
summary of all the configurable parameters of the CMT2119AW in the RFPDK. Figure 12. Accessing Embedded EEPROM CMT2113/19A Configuration Guideline”.
Table 10. Configurable Parameters in RFPDK
868.35 MHz Basic
Pin Holding Low for 2 to 90 ms.
5.4 On-line Register Configuration
power-down, and re-configuration is necessary when it is powered up again. For the detail of the on-line register configuration flow, please refer to Chapter 7.
5.5 Power Amplifier
A highly efficient single-ended Power Amplifier (PA) is integrated in the CMT2119AW to transmit the modulated signal out. detailed information please refer to “AN101 CMT211xA Schematic and PCB Layout Design Guideline”. the CMOSTEK USB Programmer and RFPDK.
5.6 PA Ramping
the PA ramping time can be calculated by formula below. device. For more detail of calculating tRAMP, please refer to “AN122 CMT2113/19A Configuration Guideline”. Figure 13. PA Ramping Time
5.7 Crystal Oscillator and RCLK
of variable load capacitors CL is built inside the CMT2119AW to support the oscillation of the crystal. choosing the right value of CL.
26 MHz
the user should set the internal load capacitor CL to its minimum value. See Figure 15 for the RCLK circuitry. Figure 15. RCLK Circuitry Figure 14. XTAL Circuitry and Crystal Model
Rev 0.9 | Page 17/29 www.hoperf.com 6. Working States and Transmission Control Interface
6.1 Working States
The CMT2119AW has following 4 different working states: SLEEP, XO-STARTUP, TUNE and TRANSMIT. SLEEP When the CMT2119AW is in the SLEEP state, all the internal blocks are turned off and the current consumption is minimized to 20 nA typically. XO-STARTUP After detecting a valid control signal on DATA pin, the CMT2119AW goes into the XO-STARTUP state, and the internal XO starts to work. The valid control signal can be a rising or falling edge on the DATA pin, which can be configured on the RFPDK. The host MCU has to wait for the tXTAL to allow the XO to get stable. The tXTAL is to a large degree crystal dependent. A typical value of tXTAL is provided in the Table 11. TUNE The frequency synthesizer will tune the CMT2119AW to the desired frequency in the time tTUNE. The PA can be turned on to transmit the incoming data only after the TUNE state is done, before that the incoming data will not be transmitted. See Figure 16 and Figure 17 for the details. TRANSMIT The CMT2119AW starts to modulate and transmit the data coming from the DATA pin. The transmission can be ended in 2 methods: firstly, driving the DATA pin low for tSTOP time, where the tSTOP can be configured from 20 to 90 ms on the RFPDK; secondly, issuing SOFT_RST command over the two-wire interface, this will stop the transmission in 1 ms. See Section 6.2.3 for details of the two-wire interface. Table 11.Timing in Different Working States Parameter Symbol Min Typ Max Unit XTAL Startup Time [1] tXTAL 400 us Time to Tune to Desired Frequency tTUNE 370 us Hold Time After Rising Edge tHOLD 10 ns Time to Stop the Transmission[2] tSTOP 2 90 ms Notes: [1]. This parameter is to a large degree crystal dependent. [2]. Configurable from 2 to 9 in 1 ms step size and 20 to 90 ms in 10 ms step size.
6.2 Transmission Control Interface
The CMT2119AW uses the DATA pin for the host MCU to send in data for modulation and transmission. The DATA pin can be used as pin for EEPROM programming, data transmission, as well as controlling the transmission. The transmission can be started by detecting rising or falling edge on the DATA pin, and stopped by driving the DATA pin low for tSTOP as shown in the table above. Besides communicating over the DATA pin, the host MCU can also communicate with the device over the two-wire interface, so that the transmission is more robust, and consumes less current. Please note that the user is recommended to use the Tx Enabled by DATA pin Rising Edge, which is described in Section 6.2.1.
6.2.1 Tx Enabled by DATA Pin Rising Edge
they are modulated. The user has to pull the DATA pin low for tSTOP in order to end the transmission. Figure 16. Transmission Enabled by DATA Pin Rising Edge
6.2.2 Tx Enabled by DATA Pin Falling Edge
transmission. Before starting the next transmit cycle, the user has to pull the DATA pin back to high. Figure 17. Transmission Enabled by DATA Pin Falling Edge
6.2.3 Two-wire Interface
requirement and data transmission control through the TWI are shown in this section.
- On-Line Register Configuration Flow
7.1 Accessing Registers with TWI
The TWI includes an input port CLK and a bi-directional port DATA. A complete Write/Read (W/R) process has 16 clock cycles. introduced below. The TWI_RST command is introduced in Table 13, Figure 20 and Figure 21in details. Figure 24. TWI W/R Timing Chart (Except for TWI_RST Command)
- The timing requirement is shown as Table 12.
- At the end of each command, the DATA should return to its default state after the last CLK rising edge within the time tDD.
- The command always start with “1”, the first 8 clock cycle includes the W/R control and address bits A[5:0]. It is a Read
command when W/R is 1, and Write command when W/R is 0. The range of the address bits is from 0x00 to 0x3F.
- In a Write command, D[7:0] is the data to be written into the register. In a Read command, D[7:0] is the data to be read
- The DATA pin is a bi-directional port, and it will be switched to output port in the last 8 clock cycle of a Read command. At
two ports and the read out function is correctly behaved.
- To simplify the expression, this datasheet is using the TWI_WRREG and TWI_RDREG to represent the write and read
command to specified registers, as shown in the table below. written ranging from 0x00 to 0xFF. For example, TWI_WRREG(0x12, 0xAA) means clocking in 0x92AA.
- Specific commands TWI_RST, TWI_OFF and SOFT_RST are also used in the on-line register configuration, refer to
Table 13 for the definition of the 3 commands.
7.2 Configuration Flow
The user should follow below flow chart for the on-line register configuration. Figure 25. On-line Register Configuration Flow
- In step-2, the host MCU issues the SOFT_RST command and needs to wait 1 ms before moving to step-3.
- The feature registers are 16-bit wide, which address is indicated as Addr in step-6. The host MCU needs to first write the
target 16-bit register by issuing TWI_WRREG(0x25, 0x1) to complete the feature register writing, as shown in step-6. Repeat step-6 if multiple feature registers are need to configured. commands shown in step-6, and listed as below.
- As a specific feature could be related to several registers, in order to change the feature correctly, the user is
of changing the frequency from 433.92 MHz to 868 MHz is listed below. file named as 433.92MHz.exp. b) Configure the device to work in 868 MHz, generate the configuration file named as 868MHz.exp in the same way. Figure 27. Please note that the address of the registers starts from 0x00 and ends at 0x15 (21 registers in total). d) Apply the corresponding register value and address in the flow shown in Figure 25.
Table 15. CMT2119AW Ordering Information [1]. “E” stands for extended industrial product grade, which supports the temperature range from -40 to +85 ℃. “S” stands for the package type of SOT23-6 for this product. “R” stands for the tape and reel package option, the minimum order quantity (MOQ) for this option is 3,000 pieces. Visit www.cmostek.com/products to know more about the product and product line. Contact sales@cmostek.com or your local sales representatives for more information.
Figure 28. 6-Pin SOT23-6 Table 16. 6-Pin SOT23-6 Package Dimensions
10.1 CMT2119AW Top Marking
9 A ① ② ③
Figure 29. CMT2119AW Top Marking Table 17. CMT2119AW Top Marking Explanation
Table 18. Other Documentations for CMT2119AW CMOSTEK USB Programmer and RFPDK.
Table 19. Document Change List
0.6 All Initial Released 2014-12-05
Rev 0.9 | Page 29/29 www.hoperf.com 13. Contact Information Hope Microelectronics Co., Ltd Address: 2/F,Building3,Pingshan Private Enterprise science and Technology Park,Xili Town,Nanshan District,Shenzhen,China Tel: +86-755-82973805 Fax: +86-755-82973550 Email: sales@hoperf.com hoperf@gmail.com Website: http://www.hoperf.com http://www.hoperf.cn The information furnished by CMOSTEK is believed to be accurate and reliable. However, no responsibility is assumed for inaccuracies and specifications within this document are subject to change without notice. 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 lif e support devices or systems without express written approval of CMOSTEK. The CMOSTEK logo is a registered trademark of CMOSTEK Microelectronics Co., Ltd. All other names are the property of their respective owners. Copyright. CMOSTEK Microelectronics Co., Ltd. All rights are reserved.