TJA1041T/VM,512 NXP Semiconductors, TJA1041T/VM,512 Datasheet - Page 10

• Manufacturer Part Number: TJA1041T/VM,512
• Description: IC CAN TXRX HI-SPEED 14-SOIC
• Manufacturer: NXP Semiconductors
• Type: Transceiverr

Specifications of TJA1041T/VM,512

• Number Of Drivers/receivers: 1/1
• Protocol: CAN
• Voltage - Supply: 4.75 V ~ 5.25 V
• Mounting Type: Surface Mount
• Package / Case: 14-SOIC (3.9mm Width), 14-SOL
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 935287965512

NXP Semiconductors
TJA1041_6
Product data sheet
7.3.3 TXD-to-RXD short-circuit detection
7.3.4 Bus dominant clamping detection
7.3.5 Overtemperature detection
7.4 Recessive bus voltage stabilization
7.5 I/O level adapter
7.6 Pin WAKE
A short-circuit between pins RXD and TXD would keep the bus in a permanent dominant
state once the bus is driven dominant, because the low-side driver of RXD is typically
stronger than the high-side driver of the controller connected to TXD. The TXD-to-RXD
short-circuit detection prevents such a network lock-up by disabling the transmitter. The
transmitter remains disabled until the local failure flag is cleared.
A CAN bus short circuit (to V
nodes could result in a differential voltage on the bus high enough to represent a bus
dominant state. Because a node will not start transmission if the bus is dominant, the
normal bus failure detection will not detect this failure, but the bus dominant clamping
detection will. The local failure flag is set if the dominant state on the bus persists for
longer than t
blocking network communication. There is no need to disable the transmitter. Note that
the local failure flag does not retain a bus dominant clamping failure, and is released as
soon as the bus returns to recessive state.
To protect the output drivers of the transceiver against overheating, the transmitter will be
disabled if the virtual junction temperature exceeds the shutdown junction temperature
T
In recessive state the output impedance of transceivers is relatively high. In a partially
powered network (supply voltage is off in some of the nodes) any deactivated transceiver
with a significant leakage current is likely to load the recessive bus to ground. This will
cause a common-mode voltage step each time transmission starts, resulting in increased
EME. Using pin SPLIT of the TJA1041 in combination with split termination (see
will reduce this step effect. In normal mode and pwon/listen-only mode pin SPLIT provides
a stabilized 0.5V
mode, pin SPLIT is set floating.
The TJA1041 is equipped with a built-in I/O-level adapter. By using the supply voltage of
the controller (to be supplied at pin V
I/O-levels of the transceiver. For pins TXD, STB and EN the digital input threshold level is
adjusted, and for pins RXD and ERR the HIGH-level output voltage is adjusted. This
allows the transceiver to be directly interfaced with controllers on supply voltages between
2.8 V and 5.25 V, without the need for glue logic.
Pin WAKE of the TJA1041 allows local wake-up triggering by a LOW-to-HIGH state
change as well as a HIGH-to-LOW state change. This gives maximum flexibility when
designing a local wake-up circuit. To keep current consumption at a minimum, after a t
delay the internal bias voltage of pin WAKE will follow the logic state of this pin. A HIGH
level on pin WAKE is followed by an internal pull-up to V
j(sd)
. The transmitter remains disabled until the local failure flag is cleared.
dom(bus)
CC
. By checking this flag, the controller can determine if a clamped bus is
DC voltage. In Standby mode, go-to-sleep command mode and Sleep
Rev. 06 — 5 December 2007
BAT
, V
CC
I/O
or GND) or a failure in one of the other network
) the level adapter ratio-metrically scales the
BAT
High speed CAN transceiver
. A LOW level on pin WAKE is
© NXP B.V. 2007. All rights reserved.
TJA1041
Figure
10 of 26
wake
5)