View source for TTJ Temperature sensor

One of the implemented features for fleet management devices is 1-Wire data protocol, which enables connection of temperature sensors. It is a perfect accessory for temperature monitoring.<br/><br/>

'''TTJ IS A SOLUTION FOR FLEET MANAGEMENT TRACKER IN FOLLOWING CASES:'''<br/>
# Thermostatic controls – maintain temperature near a desired set point.
# Thermally sensitive system – receive alerts when temperature enters or leaves pre-defined value.
# Consumer products – be assured that goods which you are delivering will maintain high quality. <br/><br/>

'''Description'''<br/>
The TTJ Temperature sensor provides 9-bit Celsius temperature measurements and has an alarm function with nonvolatile user-programmable upper and lower trigger points. The TTJ communicates over a 1-Wire bus that by definition requires only one data line (and ground) for communication with a central microprocessor. It has an operating temperature range of –55°C to +125°C and is accurate to ±0,5°C over the range of –10°C to +85°C. In addition, the TTJ can derive power directly from the data line (“parasite power”), eliminating the need for an external power supply. Each TTJ has a unique 64-bit serial code, which allows multiple TTJ sensors to function on the same 1-Wire bus. Thus, it is simple to use one microprocessor to control many TTJs distributed over a large area. Applications that can benefit from this feature include HVAC environmental controls, temperature monitoring systems inside buildings, equipment, or machinery, and process monitoring and control systems. <br/><br/>

'''TTJ technical characteristics'''
* Unique 1-Wire® Interface Requires Only One Port Pin for Communication
* Each Device has a Unique 64-Bit Serial Code Stored in an On-Board ROM
* Multidrop Capability Simplifies Distributed Temperature Sensing Applications
* Requires No External Components
* Can Be Powered From Data Line. Power Supply Range is 3.0V to 5.5V
* Measures Temperatures from -55°C to +125°C (-67°F to +257°F) ±0.5°C Accuracy from -10°C to +85°C
* 9-Bit Thermometer Resolution
* Converts Temperature in 750ms (max)
* User-Definable Nonvolatile (NV) AlarmSettings
* Alarm Search Command Identifies and Addresses Devices Whose Temperature is Outside Programmed Limits (Temperature Alarm Condition)
* Applications Include Thermostatic Controls, Industrial Systems, Consumer Products, Thermometers, or Any Thermally Sensitive System <br/>

''TTJ sensor pin-out and connection diagram:''<br/>
[[File:TTJ connection scheme.PNG|none|600px|caption]] [[File:Sch fmb120 ds1820.png||none|400px|caption]]

'''Configuration''' <br/>
On FMB unit, TTJ sensor parameters are configured as I/O element parameters: ''Dallas temperature'' and ''Dallas temperature ID''.

[[File:T sensor parameter configuration.png|none|600px|caption]]

The configuration procedure is as other I/O element (for example: [[FMB120_I/O_settings]])