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TH8082
LIN Transceiver with INH Control
Description
Applications
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Download TH8082 Datasheet (PDF)
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TH8082 General Description
The TH8082 is a physical layer device for a single wire data link capable of operating in applications where high data rate is not required and a lower data rate can achieve cost reductions in both the physical media components and in the microprocessor which use the network. The TH8082 is designed in accordance to the physical layer definition of the LIN Protocol Specification, Rev. 1.3.The IC furthermore can be used in ISO9141 systems.
Because of the very low current consumption of the TH8082 in the sleep mode it’s suitable for ECU applications with hard standby current requirements. This mode allows a shutdown of the whole application. The included wake-up function detects incoming dominant bus messages and enables the voltage regulator.
TH8082 Features and Benefits
Operating voltage VS = 6 to 18 V
Very low standby current consumption of typ. 6.5µA in sleep mode
LIN-Bus Transceiver:
Slew rate control for good EMC behavior
Fully integrated receiver filter
BUS input voltage -27V to 40V
Integrated termination resistor for LIN slave nodes (30kOhm)
Wake up via LIN bus
Baud rate up to 20 kBaud
Compliant to LIN Specification 1.3, 2.x and J2602
Compatible to ISO9141 functions
Control output for voltage regulator with low on – resistance for switchable master termination
High EMI immunity
Bus terminals proof against short-circuits and transients in the automotive environment
High impedance Bus pin in case of loss of ground and undervoltage condition
Thermal overload protection
High signal symmetry for using in RC – based slave nodes up to 2% clock tolerance
4kV ESD protection at Bus pin
TH8082 Related Products
Part Number
Description
TH8062
LIN Transceiver with integrated voltage regulator 5V/70mA
Quick Reference LIN
Transceiver and System Basis ICs
MLX80001
4-channel LIN Master Transceiver
MLX80020BB
LIN Transceiver for SAE J2602 Standard
LIN
IO-Slave/LIN Switch
MLX80020BA
Lin Transceiver for LIN 2.x Standard
TH8082 Applications
Local Interconnect Network (LIN)
Application Note
File Type
Size
Revision
Date
Action
External ESD Protection of LIN transceiver
PDF
288.8 KB
003
8/2/2007
TH8082 Documentation
DataSheet
File Type
Size
Revision
Date
Action
MLX80001 Datasheet
PDF
885.2 KB
002
6/27/2011
MLX80020 - Lin Transceiver
PDF
831.9 KB
004
11/21/2011
TH8082 DataSheet
PDF
554.4 KB
008
1/19/2011
Feature Article
File Type
Size
Revision
Date
Action
LIN – A real “Plug 'n' Play” Bus System?
PDF
2.0 MB
1.0
1/12/2009
Product flyers
File Type
Size
Revision
Date
Action
Flyer TH8082
PDF
707.9 KB
002
12/19/2006
MLX80001 Flyer
PDF
840.5 KB
05-2011
7/13/2011
Quick Reference LIN Transceiver and System Basis ICs
PDF
334.2 KB
001
1/29/2007
Web Link
File Type
Size
Revision
Date
Action
Link to LIN-Konsortium
3/31/2004
TH8082 Tools
TH8082 Environmental Information
Environmental Information
File Type
Size
Revision
Date
Action
Green / Halogen Free Compliance Declaration TH8082
PDF
39.7 KB
1.0
11/19/2009
Package Material Declaration - SOIC8 GR - S2
PDF
97.8 KB
7.0
1/25/2012
This text will be replaced
TH8082 In The Press
TH8082 Frequently asked Questions
TH8082 Pullup
Answer
To switch off the internal pull up resistor you must enter the sleep mode (high->low transition on the EN pin). But in this mode LIN bus communication is not possible. The TH8082 is designed according to the LIN specification Rev 1.3 and 2.0. In this specification the maximum of bus nodes is limited to 16. All pull up resistors and bus capacitors are designed for this maximum configuration. Do you want to use our transceiver for a standard LIN network? If not, maybe it's better to use another transceiver from Melexis.
Answer
it's a little bit difficult to use special bus tansceivers for more then one field bus system. In my opinion it will be better to use two different transceivers maybe the TH3122 for K-Bus and the TH8082 for LIN bus. So if you place the pattern of both transceivers to your PCB and select the monitor type at the assembly of your module you will get 100% compatible monitor modules for both field bus systems. If you can't do this the TH3122 is closer to your specification than the TH8082. But keep in mind that the TH3122 is a K-Bus transceiver and not 100% compatible to the LIN bus. For instance it's possible that you get problems if you want to sent LIN messages with the TH3122. For a 'monitor only' application it should work.
Question
I want to use the TH8082 LIN-Bus Transceiver for a customer project. I'm not sure if I can meet the customer requirements, because of the following problem: From the datasheet I know that there is an internal 30kOhm pullup resistor on the Bus line. In my application I need to switch this pullup on and off. Can I do that using the Enable pin? If yes, what means a switched off 30k pullup? Does it mean the Bus pin is grounded? Another question: What do I need the external 1k pullup in a master node for?
Question
As I already wrote, a key feature of my application is to switch the pullup on the bus on and off, but it must be possible to receive and transmit data even with the pullup switched off. That's possible if another node on the bus has its pullup switched on. But if I use the Enable pin to switch the pullup off, I can't receive data any more, right? Which means this plan is not working... How is it working anyway if you have for example 100 nodes with the TH8082 in a car and every node has a 30k pullup. You then need quite a big current to produce a dominant level on the bus... And why does this external 1k master pullup change anything if every node has an internal one?
About TH3122
Answer
In principle is the physical Layer of K-Bus and LIN comparable from the voltage leveles as well as from the timing. The base for the LIN definition was the K-Bus. The only difference you have to take into acount is the termination: With K-Bus you have always external pull ups in summary over the whole network of max 500Ohm and no reverse diode. With LIN you have always the slave termination integrated 30k/diode and at the LIN master a 1k with diode termination must be added external on this module. Back to your question: If you want to change from K-Bus to LIN you can use the TH8082 as pure physical layer transceiver or you can also use our TH8062 which is a physical layer LIN transceiver plus a voltage regulator 5V/70mA similat to the TH3122. To switch from K-Bus to LIN you have to secure that all external termination resistors from old K-Bus will be deleted and only at the LIN master module the 1k termination must be added. The LIN protokoll is a complete other story, means this is complete differnt to K-Bus. You need on the protocoll side a new software driver for your MCU.
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