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TH8082 Datasheet, PDF (18/26 Pages) List of Unclassifed Manufacturers – Single LIN Bus Transceiver
TH8082
Enhanced SoloLIN Transceiver
5.3 Duty Cycle Calculation
TxD
VSUP
100%
BUS
58.1%
28.4%
VSS 0%
RxD
tBit
tdom(max)
tdom(min)
tBit
trec(min)
74.4%
42.2%
trec(max)
58.1%
28.4%
Figure 9 - Duty cycle calculation in accordance to LIN 2.0
With the timing parameters shown in Figure 9 two duty cycles , based on trec(min)
calculated as follows :
D1 = trec(min) / (2 * tBit)
D2 = trec(max) / (2 * tBit)
and trec(max)
can be
For proper operation at 20KBit/s ( tBit = 50µs) the LIN driver has to fulfil the duty cycles specified in chapter
2.4 Dynamic Characteristics for supply voltages of 7 to 18V and the defined standard loads .
Due to this simplified definition there is no need to measure slew rates, slope times, transmitter delays and
dominant voltage levels as specified in the LIN physical layer specification 1.3.
The device within the D1/D2 duty cycle range operates also in applications with reduced bus speed of
10.4KBit/s or below.
In order to minimize EME, the slew rates of the transmitter can be reduced (approximately by 2 times). Such
devices have to fulfil the duty cycle definition D3/D4 in the LIN physical layer specification 2.0. Devices within
this duty cycle range cannot operate in 20KBit/s applications.
TH8082 – Datasheet
3901008082
Page 18 of 26
Feb 2007
Rev 007