TH8082

Enhanced SoloLIN Transceiver

TH8082 – Datasheet

Page 17 of 26

3901008082

Feb 2007

Rev 007

5.2

Min/max slope time calculation

60%

40%

60%

100%

0%

40%

Figure 8 - Slope time and slew rate calculation in accordance to LIN 1.3

The slew rate of the bus voltage is measured between 40% and 60% of the output voltage swing (linear

region). The output voltage swing is the difference between dominant and recessive bus voltage.

The slope time is the extension of the slew rate tangent until the upper and lower voltage swing limits:

The slope time of the recessive to dominant edge is directly determined by the slew rate control of the

transmitter:

The dominant to recessive edge is influenced from the network time constant and the slew rate control,

because it’s a passive edge. In case of low battery voltages and high bus loads the rising edge is only

determined by the network. If the rising edge slew rate exceeds the value of the dominant one, the slew rate

control determines the rising edge.