TLE7250GVIO Infineon Technologies, TLE7250GVIO Datasheet - Page 10

• Manufacturer Part Number: TLE7250GVIO
• Manufacturer: Infineon Technologies

Specifications of TLE7250GVIO

• Packages: PG-DSO-8
• Transmission Ratemax: 1.0 Mbit/s
• Quiescent Current (max.): < 15 µA @ 5V standby
• Bus Wake-up Capability: No
• Additional Features: NEN; Vio
• Wake-up Inputs: No

5
5.1
The CANH and CANL bus outputs are short-circuit proof, either against GND or a positive supply voltage. A
current limiting circuit protects the transceiver against damage. If the device heats up due to a continuous short
on the CANH or CANL, the internal overtemperature protection switches off the bus transmitter.
5.2
All logic input pins have an internal pull-up resistor to
are open or floating, the TLE7250GVIO enters the stand-by mode by default. In stand-by mode, the transmitter of
the TLE7250GVIO is disabled, the bus bias is connected to GND and the HS CAN TLE7250G transceiver does
not influence the data on the CAN bus.
5.3
The TxD time-out feature protects the CAN bus against permanent blocking in case the logical signal on the TxD
pin is continuously “low”. A continuous “low” signal on the TxD pin can have its root cause in a locked-up
microcontroller or in a short on the printed circuit board for example. In the normal-operating mode, a logical “low”
signal on the TxD pin for the time t > t
transmitter (see
RxD output pin.
Figure 5
Figure 5
input pin activates the TxD time-out function and deactivates the transmitter. To release the transmitter after a TxD
time-out event, the TLE7250GVIO requires a signal change on the TxD input pin from logical “low” to logical “high”.
5.4
The HS CAN transceiver TLE7250GVIO is provided with undervoltage detection at the power supply
the power supply
mode of TLE7250GVIO to the stand-by mode, regardless of the logical signal on the NEN pin (see
the transceiver TLE7250GVIO recovers from the undervoltage condition, the operating mode is restored to the
programmed mode by the NEN pin.
Data Sheet
CANH
CANL
TxD
RxD
illustrates how the transmitter is deactivated and activated again. A permanent “low” signal on the TxD
Fail-safe Functions
Short-circuit Protection
Unconnected Logic Pins
TxD Time-out Function
TxD Time-out function
Undervoltage Detection
Figure
V
IO
. In case of undervoltage at
5). The receiver is still active and the data on the bus continues to be monitored by the
t > t
TxD
TxD
enables the TxD time-out feature and the TLE7250GVIO disables the
V
CC
V
or
10
IO
. In case the
V
IO
TxD time-out
, the undervoltage detection changes the operating
V
IO
supply is activated and the logical pins
TxD time-out released
Rev. 1.0, 2012-03-14
Fail-safe Functions
TLE7250GVIO
Figure
V
CC
and at
t
t
t
6). If