TLE9255WLC datasheet(25/100 Pages) INFINEON

25 / 100 page

Data Sheet

Rev. 1.02 2018-02-02

TLE9255W

Modes of Operation

5.6

Automatic Bus Voltage Biasing

The automatic bus voltage biasing improves EMC performance of the entire network and increases the

reliability of communication performance in networks using CAN partial networking.

The automatic bus voltage biasing is enabled in all low power modes. The biasing unit operates independently

from all other transceiver functions and only depending on the network activity (tSilence). If tSilence has expired,

then there is no activity on the CAN bus. The tSilence timer is restarted under the following conditions:

•If tSilence has expired in Sleep WUP Sub-Mode AND a WUP is detected

•If tSilence has not expired in Sleep WUP Sub-Mode AND a rising or falling edge is detected AND the pulse

width (dominant or recessive) is greater than tFilter

• If a WUP is detected in Selective Sleep Sub-Mode

•If tSilence has expired in Stand-by Mode AND a WUP is detected

•If the tSilence has not expired in Stand-by Mode AND a rising edge or a falling edge is detected AND the pulse

width (dominant or recessive) is greater than tFilter

• If a rising or falling edge is detected in any other mode AND the pulse width (dominant or recessive) is

greater than tFilter

If there is no activity on the bus for longer than tSILENCE, then the internal resistors bias the bus pins towards

GND. On detection of a valid wake-up pattern (WUP), the internal biasing is enabled and terminates the

biasing resistors towards 2.5 V within t > tRW_Bias.

Figure 15

Bus Biasing and tSilence

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