LICAL-DEC-MS001

LICAL-DEC-MS001 LINX | Alldatasheet

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Warning: Some customers may want Linx radio frequency (“RF”) products to control machinery or devices remotely, including machinery or devices that can cause death, bodily injuries, and/or property damage if improperly or inadvertently triggered, particularly in industrial settings or other applications implicating life-safety concerns (“Life and Property Safety Situations”). NO OEM LINX REMOTE CONTROL OR FUNCTION MODULE SHOULD EVER BE USED IN LIFE AND PROPERTY SAFETY SITUATIONS. No OEM Linx Remote Control or Function Module should be modified for Life and Property Safety Situations. Such modification cannot provide sufficient safety and will void the product’s regulatory certification and warranty. Customers may use our (non-Function) Modules, Antenna and Connectors as part of other systems in Life Safety Situations, but only with necessary and industry appropriate redundancies and in compliance with applicable safety standards, including without limitation, ANSI and NFPA standards. It is solely the responsibility of any Linx customer who uses one or more of these products to incorporate appropriate redundancies and safety standards for the Life and Property Safety Situation application. Do not use this or any Linx product to trigger an action directly from the data line or RSSI lines without a protocol or encoder/ decoder to validate the data. Without validation, any signal from another unrelated transmitter in the environment received by the module could inadvertently trigger the action. All RF products are susceptible to RF interference that can prevent communication. RF products without frequency agility or hopping implemented are more subject to interference. This module does not have a frequency hopping protocol built in. Do not use any Linx product over the limits in this data guide. Excessive voltage or extended operation at the maximum voltage could cause product failure. Exceeding the reflow temperature profile could cause product failure which is not immediately evident. Do not make any physical or electrical modifications to any Linx product. This will void the warranty and regulatory and UL certifications and may cause product failure which is not immediately evident. ! Table of Contents

1 Description

1 Features

1 Applications

2 Ordering Information

2 Absolute Maximum Ratings

2 Timings

3 Electrical Specifications

4 Pin Assignments

6 Design Considerations

7 A Practical Example

8 Baud Rate Selection

9 Decoder Operation

9 Receive Mode

9 Learn Mode

10 Latch Mode

10 Receiver Control Mode

11 TX ID

11 System Example

12 Typical Applications

15 Recommended Pad Layout

15 Production Considerations

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Description

MS Series encoders and decoders are designed for remote control applications. They allow the status of up to eight buttons or contacts to be securely transferred via a wireless link. The large twenty-four bit address size makes transmissions highly unique, minimizing the possibility of multiple devices having conflicting addresses. The MS Series decoder allows the recognition of individual output lines to be easily defined for each transmitter by the manufacturer or the end user. This enables the creation of unique user groups and relationships. The decoder also identifies and outputs the originating encoder ID for logging or identification. Housed in a tiny 20-pin SSOP package, MS Series encoders feature low supply voltage and current consumption. Selectable baud rates and latched or momentary outputs make the MS Series truly versatile.

Features

• Secure 224 possible addresses
• 8 data lines
• Direct serial interface
• Latched or momentary outputs
• Definable recognition authority
• Encoder ID output by decoder
• Low 2.0 to 5.5V operating voltage
• Low supply current (370µA @ 3V)
• Ultra-low 0.1µA standby current
• True serial encoding
• Excellent noise immunity
• Selectable baud rates
• No programming required
• Small SMD package

Applications

• Keyless entry
• Door and gate openers
• Security systems
• Remote device control
• Car alarms / starters
• Home / industrial automation
• Remote status monitoring
• Lighting control MS Series Remote Control Decoder Data Guide Revised 3/18/2015 0.030 (0.75) 0.007 (0.18) 0.013 (0.32) 0.026 (0.65) 0.309 (7.85) 0.207 (5.25) 0.284 (7.20) LICAL-DEC-MS001 YYWWNNN 0.002 (0.05) 0.079 (2.00) Figure 1: Package Dimensions

– – – –4 5 Pin Assignments Figure 6: MS Series Deccoder Pin Assignments Pin Descriptions Pin Number Name I/O Description 1, 2, 13, 14, 17–20 DO–D7 O Data Output Lines. These lines reproduce the state of the encoder's data lines upon reception of a valid packet.

3 SEL_BAUD0 I

Baud Rate Selection Line 0. This line along with SEL_BAUD1 sets the baud rate of the serial data stream to one of 4 possible rates. The rate must be set before power on.

4 SEL_BAUD1 I

Baud Rate Selection Line 1. This line along with SEL_BAUD0 sets the baud rate of the serial data stream to one of 4 possible rates. The rate must be set before power on. 5, 6 GND Ground

7 LATCH I

Set Latched Outputs. If this line is low, then the data outputs are momentary (active for as long as a valid signal is received). If this line is high, the outputs are latched (when a signal is received to make a particular data line high, it remains high until another transmission is received instructing it to go low).

8 RX_CNTL I/O

Line. This line can be used to automatically power on and off a receiver. It powers the receiver down for ten times as long as it is powered on. The times are determined by the selected baud rate. Figure 7: Pin Descriptions SEL_BAUD0 SEL_BAUD1 GND GND LATCH RX_CNTL TX_ID MODE_IND VCC VCC DATA_IN LEARN 10 11 20LICAL-DEC-MS001

9 TX_ID O

Transmitter ID Output Line. A unique ID number for each transmitter is stored in the decoder’s memory. A byte is output as serial data on this line to indicate which transmitter a transmission came from.

10 MODE_IND O

Mode Indicator Output. This line switches when a valid transmission is received, when Learn Mode is entered, and when the memory is cleared. This allows for the connection of a LED to indicate to the user that these events have taken place.

11 LEARN I

Learn Mode Activation Line. When this line goes high, the decoder enters Learn Mode to accept an Address from an encoder and store it in memory. If it is held high for ten seconds, the decoder clears all stored Addresses from memory.

12 DATA_IN I

Data Input Line. This line accepts the encoded serial data stream from a receiver. 15, 16 VCC Supply Voltage None of the input lines have internal pull-up or pull-down resistors. The input lines must always be in a known state (either GND or VCC) at all times or the operation may not be predictable. The designer must ensure that the input lines are never floating, either by using external resistors, by tying the lines directly to GND or VCC, or by use of other circuits to control the line state.

– – – –6 7 Design Considerations The Linx MS Series encoders and decoders are designed for remote control applications. They provide an easy way to securely register button presses or switch closures over a wireless link. The encoder side turns the status of eight parallel input lines into a secure, encoded, serial bit-stream output intended for transmission via an RF or infrared link. Once received, the decoder decodes, error checks, and analyzes the transmission. If the transmission is authenticated, the output lines are set to replicate the status of the lines on the encoder. Prior to the arrival of the Linx MS Series, encoders and decoders typically fell into one of two categories. First were older generation, low-security devices that transmitted a fixed address code, usually set manually with a DIP switch. These address lines frequently caused the user confusion when trying to match a transmitter to a receiver. Another disadvantage was the possibility that address information could be captured and later used to compromise the system. These concerns resulted in the development of a second type of encoder / decoder that focused on security and utilized encryption to guard against code cracking or code grabbing. Typically, the encoding of each transmission changes based on complex mathematical algorithms to prevent someone from replicating a transmission. These devices gained rapid popularity due to their high security and the elimination of manual switches; however, they imposed some limitations of their own. Such devices typically offer a limited number of inputs, the transmitter and receiver can become desynchronized, and creating relationships and associations between groups of transmitters and receivers is difficult. The Linx product line, which includes the MS and HS Series, is the first product line to offer the best of all worlds. Both series accept up to eight inputs, allowing a large number of buttons or contacts to be connected. The devices also allow relationships among multiple encoders and decoders to be easily created. Security is well provided for. The MS Series uses a random fixed word with 224 possible combinations to give a high level of uniqueness and a reasonable level of security. For applications requiring the highest security, the HS Series, which employs tri-level, maximum-security encryption, should be considered. Encoder transmission protocol and methodology is a critical but often overlooked factor in range and noise immunity. The MS and HS products utilize a true serial data stream rather than the PWM schemes employed by many competitive devices. This allows products based on MS or HS devices to achieve superior range and immunity from interference, edge jitter, and other adverse external influences. One of the most important features unique to the MS and HS products is their ability to establish a unique user identity and profile for the device containing the encoder. In conventional designs, all encoded transmissions are either recognized or denied based on the address. In cases where encoder and decoder addresses match, the state of all data lines is recognized and output. Linx products uniquely allow a user or manufacturer to define which encoder inputs are acknowledged by each decoder. MS series decoders can store up to 40 system users and unique profiles for each. This allows for an incredible variety of unique relationships among multiple system components and opens the door to product features not previously possible. A Practical Example Consider this practical example: a three door garage houses Dad’s Corvette, Mom’s Mercedes and Son’s Yugo. With most competitive products, any user’s keyfob could open any garage door as long as the addresses match. In a Linx MS-based system, the keyfobs could easily be configured to open only certain doors (guess which one Son gets to open!) The MS Series also allows for component grouping. Imagine a remote control designed for use in a woodshop. One button could turn on a vacuum, one an air cleaner, and another a light, yet another button could then be user configured to turn on all of them with a single touch. The MS Series uniquely combines security and simplicity with the power to create groups and relationships. Figure 8 compares the advantages and disadvantages of different encoders.

– – – –10 11 Latch Mode The MS Series decoder has two output options based on the state of the LATCH line. If it is low, then the data lines are momentary, meaning that they are only high for as long as a valid signal is received. Once the signal stops and the decoder times out, the lines are pulled low. If the LATCH line is high, the decoder pulls a data line high upon reception of a valid signal and holds it high until the signal is received a second time, at which point the decoder pulls it low. The decoder must see a break and time out between valid transmissions before it toggles the outputs. The minimum required time-out periods are listed in the Receive Mode section. Receiver Control Mode If the RX_CNTL line is pulled high when the decoder initially powers on, then the decoder enters Receiver Control Mode. Once in this mode, the RX_CNTL line becomes an output that can be attached to the PDN or VCC line of a Linx receiver or a similar input on another receiver. This allows the decoder to power down the receiver when it is not required, thereby reducing current consumption and prolonging battery life. The decoder draws full current in this mode, but an active receiver typically draws much more than the decoder, so a savings is realized. The decoder activates the receiver for approximately one packet’s time plus 10ms for the receiver to power up, so the actual “on” time depends on the baud rate chosen by the user. This time can be calculated in milliseconds as (60/Baud Rate)(1000) + 10. The “off” time is nine times the “on” time, resulting in a 10% duty cycle, greatly reducing the receiver’s current consumption. However, there may be a lag time from when the encoder activates to when the decoder responds. The decoder enters Receive Mode when it sees a valid packet, so there would only be a lag for the first packet. This can be reduced by selecting a higher baud rate. If this feature is not going to be used, then this pin should be tied to ground. If it is tied to VCC, then the decoder will create a short when it pulls the line to ground while trying to power down the receiver. This mode is appropriate for receivers that have a high internal pull-up resistance, such as those offered by Linx. If the intended receiver does not have a pull-up, then a 100kΩ or larger resistor to VCC can be added to the RX_CNTL line to activate this mode. TX ID The TX_ID line outputs an eight-bit binary number to identify which learned encoder sent the transmission. The number is output at the baud rate set by the SEL_BAUD lines and normally corresponds to the order in which the decoder learned the encoder, so the first encoder learned gets number ‘1’, the second gets number ‘2’, and so on. An exception arises when the memory is full, in which case the first numbers are overwritten as described in the Learn Mode section. Application Note AN-00156 shows some example software to read the TX_ID and associate it with a particular encoder. The C and Visual Basic code is well documented so that it can be modified for a specific application. System Example The first step in using the decoder is to set the baud rate and determine if the outputs should be latched or momentary. Next, the decoder needs to learn the encoder’s Address. This is done by momentarily pressing the button connected to the LEARN line. The LED connected to the MODE_ IND line begins to flash to indicate that the decoder is ready to learn a new Address. One of the buttons on the transmitter is pressed to send a signal to the decoder. Once this is done, the LEARN button is pressed again to exit Learn Mode. Now, when a button is pressed on the encoder, the corresponding line on the decoder activates. If the LATCH line is high, the data line remains high until the encoder button is pressed again, telling the decoder to pull the line low. To clear the decoder's memory, the LEARN button is pressed and held for ten seconds until the MODE_IND line goes low. Once the button is released, the LED lights for two seconds to indicate that the memory has been cleared.

– – – –12 13 Typical Applications The MS decoder is ideal for replicating button presses for remote control applications. An example application circuit is shown in Figure 10. SPDT switches are used to select the baud rate and set the latch mode so that pull-down resistors are not needed. The RX_CNTL line can be connected to the PDN line of the receiver or it can be connected directly to ground. TX_ID can be connected to a microprocessor or a PC to record the transmitter identity. Application Note AN-00156 has sample code that reads the transmitter ID and displays the ID number on a LCD screen. An LED indicator is attached to the MODE_IND line to provide visual feedback to the user that an operation is taking place. This line sources a maximum of 25mA. The LEARN line is connected to a button that pulls the line high when pressed. Since the line does not have an internal pull-down resistor, a 100kΩ resistor is used to pull the line to ground when the button is not pressed. The DATA_IN line is connected directly to the data output of the receiver. To Receiver 2.2k 220 10k 100k From Receiver SEL_BAUD0 SEL_BAUD1 GND GND LATCH RX_CNTL TX_ID MODE_IND VCC VCC DATA_IN LEARN 10 11 20LICAL-DEC-MS001 To Processor or PC Figure 10: MS Series Decoder Application Circuit Data Lines D0 through D7 can be connected directly to the external circuitry that needs to be activated remotely. In this example, D5 is connected directly to a piezoelectric buzzer. This causes the buzzer to sound when the D5 line on the encoder goes high. Line D6 activates a relay through a transistor buffer when it goes high. A buffer like this may be needed if the load requires more than 25mA of current or a higher voltage source to activate. The decoder turns on the transistor, which can be selected to provide the appropriate drive levels to activate the relay.

Linx Technologies is continually striving to improve the quality and function of its products. For this reason, we reserve the right to make changes to our products without notice. The information contained in this Data Guide is believed to be accurate as of the time of publication. Specifications are based on representative lot samples. Values may vary from lot-to-lot and are not guaranteed. “Typical” parameters can and do vary over lots and application. Linx Technologies makes no guarantee, warranty, or representation regarding the suitability of any product for use in any specific application. It is the customer’s responsibility to verify the suitability of the part for the intended application. NO LINX PRODUCT IS INTENDED FOR USE IN ANY APPLICATION WHERE THE SAFETY OF LIFE OR PROPERTY IS AT RISK. Linx Technologies DISCLAIMS ALL WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL LINX TECHNOLOGIES BE LIABLE FOR ANY OF CUSTOMER’S INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING IN ANY WAY FROM ANY DEFECTIVE OR NON-CONFORMING PRODUCTS OR FOR ANY OTHER BREACH OF CONTRACT BY LINX TECHNOLOGIES. The limitations on Linx Technologies’ liability are applicable to any and all claims or theories of recovery asserted by Customer, including, without limitation, breach of contract, breach of warranty, strict liability, or negligence. Customer assumes all liability (including, without limitation, liability for injury to person or property, economic loss, or business interruption) for all claims, including claims from third parties, arising from the use of the Products. The Customer will indemnify, defend, protect, and hold harmless Linx Technologies and its officers, employees, subsidiaries, affiliates, distributors, and representatives from and against all claims, damages, actions, suits, proceedings, demands, assessments, adjustments, costs, and expenses incurred by Linx Technologies as a result of or arising from any Products sold by Linx Technologies to Customer. Under no conditions will Linx Technologies be responsible for losses arising from the use or failure of the device in any application, other than the repair, replacement, or refund limited to the original product purchase price. Devices described in this publication may contain proprietary, patented, or copyrighted techniques, components, or materials. Under no circumstances shall any user be conveyed any license or right to the use or ownership of such items. ©2015 Linx Technologies. All rights reserved. The stylized Linx logo, Wireless Made Simple, WiSE, CipherLinx and the stylized CL logo are trademarks of Linx Technologies. Linx Technologies

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