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TLE9255WLC датащи(PDF) 33 Page - Infineon Technologies AG

номер детали TLE9255WLC
подробное описание детали  HS CAN Transceiver with Partial Networking
PDF  100 Pages
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производитель  INFINEON [Infineon Technologies AG]
домашняя страница  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

TLE9255WLC датащи(HTML) 33 Page - Infineon Technologies AG

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Data Sheet
33
Rev. 1.02 2018-02-02
TLE9255W
Fail Safe Functions
6.2.2
Short-term Undervoltage detection on VCC
If the power supply VCC < VCC_UV for more than the glitch filter time tVCC_filter, then a short-term undervoltage on
VCC is detected. The glitch filter prevents an undervoltage detection due to short voltage transients on VCC. On
detection of short-term undervoltage the TLE9255W performs the following actions:
• Set short-term undervoltage bit VCC_STUV to “1” in the SPI register TRANS_UV_STAT. Only after the
completion of a Power on Reset, the VCC supply stabilization period must be completed before an
undervoltage notification can be recorded in the VCC_STUV bit. After Power on Reset the undervoltage
notification is only possible once the VCC supply has exceeded the threshold VCC_UV, that is VCC > VCC_UV.
Figure 27 shows this scenario.
• disable the transmitter
An SPI command can reset the undervoltage bit VCC_STUV. If VCC > VCC_UV for more than the glitch filter time
tVCC_filter AND if the transmitter recovery time tVCC_recovery has expired, then the transmitter is re-enabled.
Figure 26
VCC undervoltage detection
Figure 27
Undervoltage detection VCC during VCC supply stabilization period after Power on Reset
VIO and VBAT are within the functional range
VCC
t
enabled
VCC_UV
tVCC_filter
Status Bit
VCC_STUV:
tVCC_filter
disabled
„0"
„1"
Transmitter:
tVCC_filter
enabled
tVCC_recovery
VIO and VBAT are within the functional range
VCC
t
„0"
VCC_UV
Status Bit:
VCC_STUV
tVCC_filter
„1"
Notification
disabled



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