TLE7250G Infineon Technologies, TLE7250G Datasheet - Page 10

• Manufacturer Part Number: TLE7250G
• Manufacturer: Infineon Technologies

Specifications of TLE7250G

• Packages: PG-DSO-8
• Transmission Ratemax: 1.0 Mbit/s
• Quiescent Current (max.): < 15 µA @ 5V standby
• Bus Wake-up Capability: No
• Additional Features: NRM, NEN
• 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 transmitter.
5.2
All logic input pins have an internal pull-up resistor to
are open or floating, the TLE7250G enters into the stand-by mode by default. In stand-by mode, the transmitter of
the TLE7250G 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 normal-operating mode, a logical “low”
signal on the TxD pin for the time t > t
(see
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 TLE7250G requires a signal change on the TxD input pin from logical “low” to logical “high”.
5.4
The HS CAN Transceiver TLE7250G is provided with undervoltage detection at the power supply
an undervoltage event on
by mode, regardless of the logical signal on the NEN and NRM pins (see
recovers from the undervoltage condition, the operating mode is restored to the programmed mode by the logical
pins NEN and NRM.
Data Sheet
CANH
CANL
TxD
RxD
Figure
illustrates how the transmitter is deactivated and activated again. A permanent “low” signal on the TxD
5). The receiver is still active and the data on the bus continues to be monitored by the RxD output pin.
Fail-safe Functions
Short-circuit Protection
Unconnected Logic Pins
TxD Time-out Function
TxD Time-out function
Undervoltage Detection
V
CC
, the undervoltage detection changes the operating mode of TLE7250G to the stand-
t > t
TxD
TxD
enables the TxD time-out and the TLE7250G disables the transmitter
V
CC
10
. In case the
TxD time-out
V
CC
Figure
supply is activated and the logical pins
6). If the transceiver TLE7250G
TxD time–out released
Rev. 1.0, 2012-03-01
Fail-safe Functions
V
TLE7250G
CC
. In case of
t
t
t