TLE7809G datasheet(11/52 Pages) INFINEON

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Data Sheet

Rev. 3.01, 2008-04-15

TLE7809G

Operating Modes

4.3

SBC Active Mode “LIN Sleep”

In SBC Active Mode “LIN Sleep” the SBC’s current consumption is reduced by disabling the LIN transceiver.

This also means that the internal pull-up resistor of the LIN transceiver is turned off in SBC Active Mode “LIN

Sleep”. During this mode the LIN transceiver remains its wake-up capability in order to react on a remote frame or

wake-up pulse (specified in LIN Specification V2.0) from the master node or other slave nodes. In case of a wake-

up event via LIN message the (internal) RxD is pulled “low” and the “bus wake-up bit” within the SPI status word

is set. However, the LIN transceiver needs to be activated by switching to “SBC Active Mode”.

4.4

LIN Receive-Only Mode (“LIN RxD-Only”)

The LIN Receive-Only Mode (“LIN RxD-Only”) is designed for a special test procedure to check the bus

connections. Figure 5 shows a network consisting of 5 nodes. Node 1 is the LIN master node, the others are LIN

slave nodes. If the connection between node 1 and node 3 shall be tested, the nodes 2, 4 and 5 are switched into

LIN Receive-Only Mode. Node 1 and node 3 are in Active Mode. If node 1 sends a message (“remote frame”),

node 3 is the only node which is physically able to reply to the remote frame. The other nodes have their outputs

drivers disabled.

The main difference between the SBC Active Mode and the LIN Receive-Only Mode is that the LIN transmit

stage is automatically turned-off in LIN Receive-Only-Mode. However, the LIN receiver is still active in both modes.

Figure 5

Network Diagram “LIN Receive-Only Mode”

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