TLE8262E datasheet(44/93 Pages) INFINEON

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Data Sheet

Rev. 1.0, 2009-03-31

TLE8262E

LIN Transceiver

10.2.2

Slope Selection

The LIN transceiver offers a LIN Low Slope Mode for 10.4 kBaud communication and a LIN Normal Slope Mode

for 20 kBaud communication. The only difference is the behavior of the transmitter. In LIN Low Slope Mode, the

transmitter uses a lower slew rate to further reduce the EME compared to Normal Mode. This complies with SAE

J2602 requirements.

The selection is done for all transceivers at the same time so that the chip is working in either LIN Low slope Mode

or in LIN Normal Slope Mode. By default, the device works in LIN Low Slope Mode. The selection of LIN Normal

Slope Mode is done by an SPI word. The selection is accessible in SBC Normal Mode only.

10.2.3

LIN OFF Mode

In this mode, the LIN transceiver is completely disabled. Only an SPI command can reactivate the LIN cell. This

mode is accessible in SBC Normal, Stop, and Sleep Modes and is the default behavior in SBC Init Mode.

10.2.4

LIN Wake Capable Mode

This mode, which can be used in SBC Stop, Sleep, Restart and Normal Modes by programming via SPI and is

automatically accessed in SBC Fail-Safe Mode, is used to monitor bus activities. A wake up signal on the bus

results in different behavior of the SBC, as described in Table 8. After wake-up the transceiver can be switched

to LIN Normal Mode for communication. To enable the LIN Wakeable Mode after a wake via this LIN tranceiver,

the deticated LIN transceiver must be switched to LIN Normal Mode, LIN Receive Only Mode or LIN Off, before

switching to LIN Wakeable Mode again.

Wake-Up in SBC Sleep Mode

Wake-up is possible via a LIN message (filtering time t >

WK,bus), it automatically transfers the SBC into the SBC

Restart Mode and from there to Normal Mode the corresponding RxD pins in set to LOW, see Figure 19. The

microcontroller is able to detect the low signal on RxD and to read the wake source out of the “Wake Register

Interrupt” register (000) via SPI. No Interrupt is generated when coming out of Sleep Mode. The µC can now switch

the CAN transceiver into LIN Normal Mode via SPI to start communication.

Wake-Up in SBC Stop Mode

In SBC Stop Mode, if a wake-up is detected, it is signaled by the INT output and by the “WK LINx” SPI bit. It is also

signaled by RxDLINx put to low.The microcontroller should set the device to SBC Normal Mode, there is no

automatic transition to Normal Mode. In Normal Mode the transceiver can be enabled via SPI.

Table 8

Action Due to a CAN Wake Up

SBC Mode

SBC Mode after wake

Vcc1µC

INT

RxD

Int. Bit

WK CAN

Sleep Mode

Restart Mode

Ramping up

HIGH

LOW

Stop Mode

LOW1)

1) When not masked via SPI

LOW

Restart Mode

Ramping up / ON

HIGH

LOW

Fail-Safe Mode

Restart Mode

Ramping up

HIGH

LOW

Normal Mode

LOW1)

LOW

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