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PDF TLE6251D Data sheet ( Hoja de datos )
| Número de pieza | TLE6251D | |
| Descripción | High Speed CAN-Transceiver | |
| Fabricantes | Infineon Technologies | |
| Logotipo |  |
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TLE6251D
High Speed CAN-Transceiver with Bus Wake-up
Data Sheet
Rev. 1.0, 2012-07-27
Automotive Power
1 page  
3 Pin Configuration
3.1 Pin Assignment
TLE6251D
Pin Configuration
TxD
GND
VCC
RxD
1
2
3
4
8 STB
7 CANH
6 CANL
5 VIO
Figure 2 Pin configuration
3.2 Pin Definitions
Table 1
Pin No.
1
2
3
4
5
6
7
8
Pin Definitions and Functions
Symbol
Function
TxD
GND
Transmit Data Input;
Internal pull-up to VIO, “low” for “dominant” state.
Ground
VCC Transceiver Supply Voltage;
100 nF decoupling capacitor to GND required,
VCC can be turned off in stand-by mode.
RxD Receive Data Output;
“low” in “dominant” state.
VIO Digital Supply Voltage Input;
supply voltage input to adapt the logical input and output voltage levels of the
transceiver to the microcontroller supply.
Supply for the low-power receiver.
100 nF decoupling capacitor to GND required.
CANL
CAN Bus Low level I/O;
“low” in “dominant” state.
CANH
CAN Bus High level I/O;
“high” in “dominant” state.
STB Stand-by Input;
internal pull-up to VIO, “low” for normal-operating mode.
Data Sheet
5 Rev. 1.0, 2012-07-27
5 Page 
TLE6251D
Fail Safe Functions
5 Fail Safe Functions
5.1 Short-circuit Protection
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 damages. 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 Unconnected Logical Pins
All logical input pins have an internal pull-up resistor to VIO. In case the VIO supply is activated and the logical pins
are open or floating, the TLE6251D enters the stand-by mode by default. In stand-by mode, the transmitter of the
TLE6251D is disabled, the bus bias is turned off and the input resistors of CANH and CANL are connected to GND.
The HS CAN transceiver TLE6251D will not influence the data on the CAN bus.
5.3 TxD Time-out Function
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 > tTxD enables the TxD time-out feature and the TLE6251D disables the
transmitter (see Figure 6). The receive unit is still active and the data on the bus continue to be monitored by the
RxD output pin.
CANH
CANL
t > tTxD
TxD time-out
TxD time-out released
t
TxD
t
RxD
t
Figure 6 TxD Time-out function
Figure 6 shows how the transmitter is deactivated and re-activated again. A permanent “low” signal on the TxD
input pin activates the TxD time-out function and deactivates the transmitter. To release the transmitter after a TxD
time-out event, the TLE6251D requires a signal change on the TxD input pin from logical “low” to logical “high”.
Data Sheet
11 Rev. 1.0, 2012-07-27
11 Page | ||
| Páginas | Total 27 Páginas | |
| PDF Descargar | [ Datasheet TLE6251D.PDF ] | |
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