TLE9222 datasheet(13/43 Pages) INFINEON

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Data Sheet

Rev. 1.2

2017-10-17

TLE9222

FlexRay Transceiver

Functional description

A “low” output level on the ERRN pin is latched. To reset the ERRN event and the status register either a correct

read-out of the status register or a mode change by the host command is required, given that the error

condition has been resolved.

4.5

Power supply interface

The TLE9222 is powered by the VCC pin which shall be connected to a voltage supply with nominal 5 V.

Additionally, the TLE9222 provides the VIO reference voltage pin for all digital inputs and outputs. The voltages

at the VCC and VIO pins are monitored for detection of undervoltage events.

4.5.1

VCC undervoltage detection

The TLE9222 detects undervoltage events on the VCC pin if the voltage uVCC falls below the undervoltage

detection threshold uBDUVVCC for a time t > dBDUVVCC_blk. Upon detection the VCC-undervoltage flag and the

error flag are set. In case the TLE9222 is in BD_Normal mode, the transmitter will be disabled and the ERRN

output will go “low” after the time dReactionTimeERRN. After the time dBDUVVCC the TLE9222 will force a

transition to BD_Standby, regardless of the host command (see Figure 6).

Figure 6

VCC undervoltage detection

The TLE9222 recovers from a VCC undervoltage event after the time t > dBDRVCC following the voltage uVCC rise

above the undervoltage detection threshold uBDUVVCC. This will release the host command and change

operation mode accordingly.

4.5.2

VIO undervoltage detection

The VIO undervoltage detection is similar to that on the VCC supply. Undervoltage events on the VIO pin are

detected if the voltage uVIO falls below the undervoltage detection threshold uUVIO for a time t > dBDUVVIO_blk.

Upon detection the VIO-undervoltage flag and the error flag are set. While an undervoltage event is present on

the VIO pin, the reference threshold levels of all digital input and output pins are invalid. Therefore, the

TLE9222 blocks the host interface, communication controller interface, SPI interface and the bus guardian

interface. The digital outputs RxD and ERRN are set “low” and all digital input pins follow their default levels

TLE9222_VCC_UNDERVOLTAGE_V00

uVCC

Set VCC-undervoltage flag

Set Error flag

Transmitter blocked

BD_Normal mode

dBDRVCC

Block host command

Forced mode change

ERRN pin „low“

Host command released

BD_Standby mode

According to Host command

uBDUVVCC

dBDUVVCC_blk

t < dBDUVVCC_blk

High

Low

dBDUVVCC

TLE9222 Datasheet(PDF) 13 Page - Infineon Technologies AG

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