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NCV7349D10R2G Datasheet(PDF) 5 Page - ON Semiconductor

Part # NCV7349D10R2G
Description  High Speed Low Power CAN Transceiver
Download  12 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCV7349D10R2G Datasheet(HTML) 5 Page - ON Semiconductor

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NCV7349
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5
Over−temperature Detection
A thermal protection circuit protects the IC from damage
by switching off the transmitter if the junction temperature
exceeds a value of approximately 170
°C. Because the
transmitter dissipates most of the power, the power
dissipation and temperature of the IC is reduced. All other
IC functions continue to operate. The transmitter off−state
resets when the temperature decreases below the shutdown
threshold and pin TxD goes high. The thermal protection
circuit is particularly needed when a bus line short circuits.
TxD Dominant Time−out Function
A TxD dominant time−out timer circuit prevents the bus
lines being driven to a permanent dominant state (blocking
all network communication) if pin TxD is forced
permanently low by a hardware and/or software application
failure. The timer is triggered by a negative edge on pin TxD.
If the duration of the low−level on pin TxD exceeds the
internal timer value tdom(TxD), the transmitter is disabled,
driving the bus into a recessive state. The timer is reset by a
positive edge on pin TxD.
This TxD dominant time−out time (tdom(TxD)) defines the
minimum possible bit rate to 15 kbps.
Fail Safe Features
A current−limiting circuit protects the transmitter output
stage from damage caused by accidental short circuit to
either positive or negative supply voltage, although power
dissipation increases during this fault condition.
Undervoltage on VCC pin prevents the chip sending data
on the bus when there is not enough VCC supply voltage.
After supply is recovered TxD pin must be first released to
high to allow sending dominant bits again. Recovery time
from undervoltage detection is equal to td(stb−nm) time.
VIO supply dropping below VUVDVIO undervoltage
detection level will cause the transmitter to disengage from
the bus (no bus loading) until the VIO voltage recovers
(NCV7349−3 version only).
The pins CANH and CANL are protected from
automotive electrical transients (according to ISO 7637; see
Figure 7). Pins TxD and STB are pulled high internally
should the input become disconnected. Pins TxD, STB and
RxD will be floating, preventing reverse supply should the
VIO supply be removed.


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