TLE9221SX Datasheet, PDF (59/91 Pages) Infineon Technologies AG – FlexRay Transceiver

TLE9221SX
Overtemperature Protection
11
Overtemperature Protection
The Transmitter of TLE9221SX is protected against overheating with an internal temperature sensor (compare
with Figure 4). The temperature sensor provides two temperature thresholds: T_J(Warning) and T_{J(Shut_Down)}.
On exceeding the lower threshold T_J(Warning), the transceiver sets the overtemperature warning bit (bit 6), indicating
a “high” temperature situation. On exceeding the upper threshold T_{J(Shut_Down),} the transceiver TLE9221SX sets the
overtemperature shut down bit (bit 5), indicating a critical temperature situation. On reaching the T_{J(Shut_Down)}
threshold, the transceiver TLE9221SX also disables the Transmitter (see Figure 38). The overtemperature
detection of the Transmitter is active only in BD_Normal mode. An overtemperature detection event does not
trigger any change in the operating mode.
Both bits, the overtemperature shut down bit and the overtemperature warning bit set the error bit (bit 11) in the
SIR. The error bit is indicated at the ERRN output (compare with Chapter 6.3 “Status Information at the ERRN
Output Pin”).
The Transmitter can be enabled again after an overtemperature event by clearing the SIR (see also
Chapter 6.2.3 “Clearing Sequence of SIR”).
T_J
T_{J(Shut_Down)}
T_J(Warning)
t
BP
BM
t
TxD
t
RxD
t
ERRN
dReTime_ERRN
t
BD_Normal
Figure 38 Overtemperature protection
Data Sheet
59
Rev. 1.10, 2013-07-15