TT Series Remote Control Transceiver Data Guide
Table of Contents 1^ 1^ 2^ 2^ 4^ 4^ 10^ 10^ 12^ 13^ 14^ 16^ 17^ 17^ 18^ 19^ 19^ 20^ 20^ 21^ 21^ 22^ 22^ 24^ 27^ 28^ 28^ 29^ 30^ Description Features Ordering Information Electrical Specifications Absolute Maximum Ratings Typical Performance Graphs Pin Assignments Pin Descriptions Theory of Operation Module Description Basic Hardware Operation Transceiver Operation Transmit Operation Receive Operation The Pair Process Permissions Mask Acknowledgement Mode Indicator Reset to Factory Default Using the RSSI Li
1^ 31^ 32^ 34^ 34^ 35^ 36^ 37^ 37^ 39^ 40^ 40^ 40^ 42^ 44^ 46^ Product Labeling FCC RF Exposure Statement Typical Applications Power Supply Requirements Antenna Considerations Helpful Application Notes from Linx Interference Considerations Pad Layout Board Layout Guidelines Microstrip Details Production Guidelines Hand Assembly Automated Assembly General Antenna Rules Common Antenna Styles Regulatory Considerations TT Series Remote Control Transceiver Data Guide 1.
Ordering Information TT Series Transceiver Specifications Ordering Information Parameter Part Number Description Antenna Port TRM-900-TT 900MHz TT Series Remote Control Transceiver RF Impedance MDEV-900-TT TT Series Master Development System Environmental Transceivers are supplied in tubes of 18 pcs. Figure 2: Ordering Information Symbol Min. Typ. Max. Units Notes Power Supply VCC TX Supply Current lCCTX Notes Ω 50 −40 +85 ºC Storage Temp.
Typical Performance Graphs Absolute Maximum Ratings Supply Voltage Vcc −0.3 to +5.5 VDC Any Input or Output Pin −0.3 to VCC + 0.3 VDC Operating Temperature −40 to +85 ºC Storage Temperature −55 to +125 ºC RF Input 0 dBm Exceeding any of the limits of this section may lead to permanent damage to the device. Furthermore, extended operation at these maximum ratings may reduce the life of this device.
+85°C 36 TX Icc (mA) RSSI Output Voltage (V) 37 -40°C 35 34 +25°C 33 32 2.5 3.5 4.5 5.5 Supply Voltage (V) Figure 9: TT Series Transceiver TX Current Consumption vs. Supply Voltage at +12.5dBm TX Icc (mA) 17 6 5.5V Vcc 5 4 3 2 3.3V Vcc 2.5V Vcc 1 0 -30 -40 -50 -60 -70 Figure 12: TT Series Transceiver RSSI Voltage vs. Input Power +85°C 16 15 14 2.5 -40°C +25°C 3.5 5.5 4.5 Supply Voltage (V) Figure 10: TT Series Transceiver TX Current Consumption vs.
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Pin Assignments Pin Descriptions Continued GND NC GND NC NC GND NC NC S0 S1 GND S2 S3 LVL_ADJ LATCH_EN RESET GND S7 S6 S4 RSSI GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 GND ANTENNA GND NC NC GND NC NC ACK_EN MODE_IND GND PAIR C1 ACK_OUT C0 CMD_DATA_OUT GND CMD_DATA_IN S5 VCC POWER_DOWN GND Pin Number 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 Name I/O 15 LATCH_EN I If this line is high, then the status line outputs are latched (a received command to acti
Theory of Operation Module Description The TT Series transceiver is a low-cost, high-performance synthesized FSK transceiver. Its exceptional sensitivity results in outstanding range performance. Figure 15 shows a block diagram for the module. The TT Series Remote Control module is a completely integrated RF transceiver and processor. It has two main modes of operation: hardware and software.
Basic Hardware Operation 1 GND The following steps describe how to use the TT Series module with hardware only. Basic application circuits that correspond to these steps are shown in Figure 16. GND GND 2. Press the PAIR button on both sides. The MODE_IND LED begins flashing slowly to indicate that the module is searching for another module. GND 9 10 11 GND 100k 12 13 VCC 3. Once the pairing is complete, the MODE_IND LED flashes quickly to indicate that the pairing was successful.
Transceiver Operation Transmit Operation The transceiver has two modes of operation: Initiating Unit (IU) that transmits control messages and Responding Unit (RU) that receives control messages. If all of the status lines are set as inputs, then the module is set as an IU only. The module stays in a low power sleep mode until a status line goes high, starting the Transmit Operation. Transmit Operation is entered when any of the status line inputs go high.
The Pair Process Permissions Mask The Pair process enables two transceivers to communicate with each other. Each transceiver has a local 32-bit address that is transmitted with every packet. If the address in the received packet is not in the RU’s Paired Module List, then the transceiver does not respond. Adding devices to the authorized list is accomplished through the Pair process or by a serial command. Each module can be paired with up to 40 other modules.
Mode Indicator Using the RSSI Line The Mode Indicator line (MODE_IND) provides feedback about the current state of the module. This line switches at different rates depending on the module’s current operation. When an LED is connected to this line it blinks, providing a visual indication to the user. Figure 17 gives the definitions of the MODE_IND timings. The module’s Received Signal Strength Indicator (RSSI) line outputs a voltage proportional to the incoming signal strength. The RSSI Voltage vs.
Using the Low Power Features The Power Down (POWER_DOWN) line can be used to completely power down the transceiver module without the need for an external switch. This line allows easy control of the transceiver power state from external components, such as a microcontroller. The module is not functional while in power down mode.
The Command Data Interface The TT Series transceiver has a serial Command Data Interface (CDI) that offers the option to configure and control the transceiver through software instead of through hardware. This interface consists of a standard UART with a serial command set. This allows for fewer connections in applications controlled by a microcontroller as well as for more control and advanced features than can be offered through hardware pins alone.
Command Data Interface Commands and Parameters Command Description Read Read the current value in volatile memory. If there is no volatile value, then the non-volatile value is returned. Write Write a new value to volatile memory. Read NV Read the value in non-volatile memory. Program Program a new value to non-volatile memory. Set Default Configuration Set all configuration items to their factory default values. Erase All Addresses Erase all paired addresses from memory.
Usage Guidelines for FCC Compliance Information to the user The TT Series module is provided with an FCC and Industry Canada Modular Certification. This certification shows that the module meets the requirements of FCC Part 15 and Industry Canada license-exempt RSS standards for an intentional radiator. The integrator does not need to conduct any further testing under these rules provided that the following guidelines are met: The following information must be included in the product’s user manual.
Antenna Selection Under FCC and Industry Canada regulations, this radio transmitter may only operate using an antenna of a type and maximum (or lesser) gain approved for the transmitter by the FCC and Industry Canada. To reduce potential radio interference to other users, the antenna type and its gain should be so chosen that the equivalent isotropically radiated power (e.i.r.p.) is not more than that necessary for successful communication.
Typical Applications GND 1 GND GND 44 GND GND NC Figure 22 and Figure 23 show circuits usingANTENNA the TT Series transceiver.
Power Supply Requirements Vcc TO MODULE 10Ω Vcc IN + The transceiver incorporates a precision low-dropout regulator which allows operation over a wide input voltage range. Despite this regulator, it is still important to provide a supply that is free of noise. Power supply noise can significantly affect the module’s performance, so providing a clean power supply for the module should be a high priority during design.
Interference Considerations Pad Layout The RF spectrum is crowded and the potential for conflict with unwanted sources of RF is very real. While all RF products are at risk from interference, its effects can be minimized by better understanding its characteristics. The pad layout diagram in Figure 27 is designed to facilitate both hand and automated assembly. Interference may come from internal or external sources. The first step is to eliminate interference from noise sources on the board.
Do not route PCB traces directly under the module. There should not be any copper or traces under the module on the same layer as the module, just bare PCB. The underside of the module has traces and vias that could short or couple to traces on the product’s circuit board. The Pad Layout section shows a typical PCB footprint for the module. A ground plane (as large and uninterrupted as possible) should be placed on a lower layer of your PC board opposite the module.
The module is housed in a hybrid SMD package that supports hand and automated assembly techniques. Since the modules contain discrete components internally, the assembly procedures are critical to ensuring the reliable function of the modules. The following procedures should be reviewed with and practiced by all assembly personnel. Hand Assembly Pads located on the bottom Soldering Iron of the module are the primary Tip mounting surface (Figure 30).
General Antenna Rules The following general rules should help in maximizing antenna performance. 1. Proximity to objects such as a user’s hand, body or metal objects will cause an antenna to detune. For this reason, the antenna shaft and tip should be positioned as far away from such objects as possible. 2. Optimum performance is obtained from a 1/4- or 1/2-wave straight whip mounted at a right angle to the ground plane (Figure 33).
Common Antenna Styles There are hundreds of antenna styles and variations that can be employed with Linx RF modules. Following is a brief discussion of the styles most commonly utilized. Additional antenna information can be found in Linx Application Notes AN-00100, AN-00140, AN-00500 and AN-00501. Linx antennas and connectors offer outstanding performance at a low price. Whip Style A whip style antenna (Figure 36) provides outstanding overall performance and stability.
Regulatory Considerations Note: Linx RF modules are designed as component devices that require external components to function. The purchaser understands that additional approvals may be required prior to the sale or operation of the device, and agrees to utilize the component in keeping with all laws governing its use in the country of operation.
Linx Technologies 159 Ort Lane Merlin, OR, US 97532 3090 Sterling Circle Suite 200 Boulder, CO 80301 Phone: +1 541 471 6256 Fax: +1 541 471 6251 www.linxtechnologies.com Disclaimer 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.
