TLE9221SX Datasheet, PDF(28/91 Page) Infineon Technologies AG

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TLE9221SX Datasheet, PDF (28/91 Pages) Infineon Technologies AG – FlexRay Transceiver

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TLE9221SX

Wake-up Detector

uBus

wake-up pattern

wake-up symbol

âData_1â

wake-up symbol

âData_1â

wake-up detection

set remote wake-up bit

âIdleâ

uData0_LP

âData_0â

dWU0Detect

dWUIdleDetect

dWU0Detect

dWUTimeout

dWUIdleDetect

dBDWakeupReactionremote

RxD

RxEN

Figure 19 Alternative wake-up pattern

BD_Sleep

BD_Standby

7.2.3 Wake-up by Payload

Besides sending a dedicated wake-up pattern on the FlexRay bus, it is also possible to wake up the TLE9221SX

with a wake-up message hidden in the data field of the standard FlexRay frame, called wake-up by payload.

In comparison to the wake-up by standard pattern or to the wake-up with an alternative pattern, the wake-up by

payload is limited to a data transmission rate of 10 Mbit/s.

A dedicated Byte Start Sequence is transmitted before each byte of the payload within the FlexRay data frame.The

Byte Start Sequence (BSS) consists of one âhighâ bit followed by one âlowâ bit. To transmit a âData_0â byte to the

FlexRay bus, the FlexRay controller sends 10 bits. First a âhighâ bit as part of the Byte Start Sequence, followed

by a âlowâ bit which also belongs to the Byte Start Sequence and after the Byte Start Sequence, the controller

sends eight âlowâ bits (HL= BSS; LLLLLLLL= âData_0â). Sending a âData_1â byte the FlexRay controller sends a

âhighâ bit followed by a âlowâ bit and then sends eight consecutive âhighâ bits (HL= BSS; HHHHHHHH= âData_1â)

(see Figure 20).

At a data rate of 10 Mbit/s, one bit in the FlexRay data frame has a bit length of 100 ns. This means that each data

byte in a wake-up pattern has one glitch of 100 ns.

The Wake-up Detector of TLE9221SX has an analog input filter implemented, which filters out the glitches on the

wake-up pattern for glitches shorter than t = dWUInterrupt.

Receiving a complete wake-up by payload, the TLE9221SX sets the remote wake-up bit, the wake-up flag and

also the wake-up source bit. The wake-up flag is set in case the following data pattern is detected in a FlexRay

frame.

0xFF

0x00

0xFF

0x00

In case any incomplete wake-up pattern is received, no wake-up flag is set and no entry is made to the SIR.

Data Sheet

Rev. 1.10, 2013-07-15

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