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Table of Contents

 1

  Description

 1

  Features

 2

  Ordering Information

 2

 

Electrical Specifications

 4

  Absolute Maximum Ratings

 5

  Transceiver Timings

 6

  TRM-xxx-TT Typical Performance Graphs

 12

  Pin Assignments

 12

  Pin Descriptions

 14

  Theory of Operation

 15

  Module Description

 16

  Basic Hardware Operation

 18

  Transceiver Operation

 19

  Transmit Operation

 19

  Receive Operation

 20

  The Pair Process

 21

  Permissions Mask

 21

  Acknowledgement

 22

  Mode Indicator

 22

  Reset to Factory Default

 23

  Using the RSSI Line

 23

  Using the LATCH_EN Line

 24

  Using the Low Power Features

 24

  Using the LVL_ADJ Line

 26

  Receiver Duty Cycle

 27

  Power Supply Requirements

 28

  The Command Data Interface

 31

  Frequency Hopping

 32

  Usage Guidelines for FCC Compliance

         Warning:

 

Linx radio frequency ("RF") products may be  

used 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. No Linx 
Technologies product is intended for use in any application without 
redundancies where the safety of life or property is at risk.

The customers and users of devices and machinery controlled with  
RF products must understand and must use all appropriate safety 
procedures in connection with the devices, including without limitation, 
using appropriate safety procedures to prevent inadvertent triggering by 
the user of the device and using appropriate security codes to prevent 
triggering of the remote controlled machine or device by users of other 
remote controllers.   

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 have 
a frequency hopping protocol built in, but the developer should still be 
aware of the risk of interference.

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.

!

Summary of Contents for EVAL-900-TT

Page 1: ...TT Series Remote Control and Sensor Transceiver Data Guide...

Page 2: ...RF products must understand and must use all appropriate safety procedures in connection with the devices including without limitation using appropriate safety procedures to prevent inadvertent trigg...

Page 3: ...nfiguration is provided by a UART interface however no programming is required for basic operation Housed in a compact reflow compatible SMD package the transceiver requires no external RF components...

Page 4: ...ransceivers are supplied in tubes of 18 pcs Figure 2 Ordering Information TT Series Transceiver Specifications Parameter Symbol Min Typ Max Units Notes Receiver Section Spurious Emissions Per FCC 15 1...

Page 5: ...TX MODE_IND RX Sx A B C D E F G H RX MODE_IND AB TX Power up Response 80ms BC RX Initial Response 8 to 50ms with no interference CD Data Settle 4 to 8us EF Data Update Delay During Active Session 5 to...

Page 6: ...m 85 C 25 C 40 C Figure 7 TT Series Transceiver Peak Current Consumption vs Transmitter Output Power at 3 3V Figure 9 TT Series Transceiver Average Current Consumption vs Transmitter Output Power at 3...

Page 7: ...A Supply Voltage V 85 C 25 C 40 C Figure 11 TT Series Transceiver TX Current Consumption vs Supply Voltage at Max Power Figure 13 TT Series Transceiver Transmitter Output Power vs Supply Voltage 11 11...

Page 8: ...Voltage Figure 17 TT Series Transceiver RSSI Voltage vs Input Power 0 1 1 10 0 15 30 45 60 75 90 105 120 135 150 165 180 195 210 225 240 255 Average Current mA Duty Cycle s 2 5VDC 3 0VDC 3 3VDC 5 0VD...

Page 9: ...be left unconnected 21 RSSI O Received Signal Strength Indicator This line outputs an analog voltage that increases with the strength of the received signal It is updated once a second 24 POWER_DOWN...

Page 10: ...DIVIDER MODULATOR GAUSSIAN FILTER fDEV DIVIDER LNA ANTENNA GPIO INTERFACE LDO VCC PDN INTERFACE VOLTAGE TRANSLATION Figure 20 TT Series Transceiver RF Section Block Diagram Module Description The TT S...

Page 11: ...more advanced features that are available with the serial interface 1 TRM XXX TT NC 2 GND 3 NC 4 NC 5 GND 6 NC 7 S0 9 S1 10 GND 11 S7 18 S6 19 RSSI 21 GND 22 GND 23 POWER_DOWN 24 VCC 25 S5 26 CMD_DATA...

Page 12: ...custom data is programmed into the module using a serial command Transmit Operation Transmit Operation is entered when any of the status line inputs go high During Transmit Operation the MODE_IND lin...

Page 13: ...the MODE_IND line for 10 seconds and neither of the Pairing units will store an address In this case the module should either be reset to clear the address table or the serial interface can be used to...

Page 14: ...n the reset sequence is recognized Extended Pair Completed Solid ON when the pairing operation is completed and waiting for the PAIR line to go low Figure 22 MODE_IND Timing Using the RSSI Line The mo...

Page 15: ...t to part Warning The LVL_ADJ line uses a resistor divider to create a voltage that determines the output power Any additional current sourcing or sinking can change this voltage and result in a diffe...

Page 16: ...eceiver on after it has completed some activity This activity includes completing a transmission and receiving a valid packet After KeepOn seconds have elapsed with no transmit or valid receive activi...

Page 17: ...operate as momentary or latched Add or remove specific paired devices Individually set Permission Masks that prevent certain paired devices from activating certain status line outputs Change the modul...

Page 18: ...ast received packet Read only Interrupt Mask Sets the mask for events to generate a break on CMD_DATA_ OUT Event Flags Event flags that are used with the Interrupt Mask Figure 28 TT Series Transceiver...

Page 19: ...rator is required to perform unintentional radiator testing on the final product per FCC sections 15 107 and 15 109 and IC RSS GEN Information to the user The following information must be included in...

Page 20: ...cally radiated power e i r p is not more than that necessary for successful communication The TRM 900 TT radio transmitter has been approved by the FCC and Industry Canada to operate with the antenna...

Page 21: ...GND GND GND GND GND GND GND GND GND GND GND VCC VCC GND 91k 1 GND S0 S1 S2 S3 VCC GND GND 100k GND VCC 100k 100k 100k GND GND GND GND VCC VCC VCC VCC VCC 100k VCC RX TX GPIO 100k Figure 31 TT Series T...

Page 22: ...election and location within the end product Linx offers cable assemblies with a U FL connector on one end and several types of standard and FCC compliant reverse polarity connectors on the other end...

Page 23: ...Multipath is a term used to refer to the signal cancellation effects that occur when RF waves arrive at the receiver in different phase relationships This effect is a particularly significant factor i...

Page 24: ...tric properties Since such compounds can considerably impact RF performance and the ability to rework or service the product it is the responsibility of the designer to evaluate and qualify the impact...

Page 25: ...aximum Solder Times Absolute Maximum Solder Times Hand Solder Temperature 427 C for 10 seconds for lead free alloys Reflow Oven 255 C max see Figure 40 Reflow Temperature Profile The single most criti...

Page 26: ...d configuration constraints In these instances a designer must make the best use of the area available to create as much ground OPTIMUM USABLE NOT RECOMMENDED NUT GROUND PLANE MAY BE NEEDED CASE Figur...

Page 27: ...les Linx offers a wide variety of specialized antenna styles Figure 46 Many of these styles utilize helical elements to reduce the overall antenna size while maintaining reasonable performance A helic...

Page 28: ...testing laboratories across the country Many labs can also provide other certifications that the product may require at the same time such as UL CLASS A B etc Once the completed product has passed an...

Page 29: ...stomer 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 p...

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