TLE9221SX Datasheet, PDF (42/91 Pages) Infineon Technologies AG – FlexRay Transceiver

TLE9221SX
Operating Mode Description
9
Operating Mode Description
The FlexRay transceiver TLE9221SX provides several different operating modes. The four main operating modes
are implemented to handle the requirements of a FlexRay ECU and to satisfy the requirements of the FlexRay
EPL Specification, version 3.0.1. Two product-specific interim operation modes are implemented to guarantee
secure mode changes even under failure conditions. The BD_Off state describes the behavior of the TLE9221SX,
while it is not supplied (see Table 11).
Table 11 Operating modes overview
Modes of Operation
Description
Clustering
Operating mode according to FlexRay EPL, version 3.0.1
BD_Normal
Normal operating mode to transmit data to the bus and
receive data from the bus.
non-low power mode
BD_ReceiveOnly
The TLE9221SX can receive data from the bus, but the
Transmitter is blocked.
non-low power mode
BD_Standby
Transmitter and Receiver are turned off, the diagnostic
functions and wake-up detection are available.
low power mode
BD_Sleep
All functions, except the wake-up detection are turned off. low power mode
Product-specific operating modes
BD_GoToSleep
Transition mode to change over to the BD_Sleep mode via a interim mode
host command.
Interim_BD_Standby
Transition mode, to which a changeover is made only after interim mode
an incomplete power-up
Power-Down
BD_Off
State of the TLE9221SX when no supply is fed to it
power-down state
9.1
Operating Mode Transitions Overview
Depending on the currently selected operating mode, several events can trigger a change of the operating mode.
The options are:
• A valid host command at the Host Interface.
• Setting an undervoltage flag, either for the power supplies uV_BAT and uV_CC or for the reference voltage uV_IO.
• Recovery from an undervoltage event, either for the power supplies uV_BAT and uV_CC or for the reference
voltage uV_IO.
• Wake-up detection either on the FlexRay bus or on the local wake-input WAKE.
• A power-up event at the power supplies uV_BAT and uV_CC.
It is not possible to change over to every operating mode by a trigger event. There are limitations and
dependencies (see Table 12).
Table 12 Options for changeover to various operating modes
Target Mode
Trigger Event for the Mode Change
Limitation
BD_Normal
Changeover to BD_Normal mode can be made only Host commands are blocked if
by a valid host command.
any undervoltage flag is set.
BD_ReceiveOnly
Changeover to BD_ReceiveOnly mode can be made Host commands are blocked if
only by a valid host command.
any undervoltage flag is set.
Data Sheet
42
Rev. 1.10, 2013-07-15