TLE8250G_14 Datasheet, PDF (9/24 Pages) Infineon Technologies AG – High Speed CAN-Transceiver

TLE8250G
Functional Description
4.3
Normal Operation Mode
In Normal Operation mode the HS CAN transceiver TLE8250G sends the serial data stream on the TxD pin to the
CAN bus while at the same time the data available on the CAN bus are monitored to the RxD pin. In Normal
Operation mode all functions of the TLE8250G are active:
• The output driver stage is active and drives data from the TxD to the CAN bus.
• The receiver unit is active and provides the data from the CAN bus to the RxD pin.
• The bus basing is set to V_CC/2.
• The under-voltage monitoring on the power supply V_CC is active.
To enter the Normal Operation mode set the pin NRM to logical “High” and the pin NEN to logical “Low” (see
Table 2 or Figure 4). Both pins, the NEN pin and the NRM pin have internal pull-up resistors to the power-supply
V_CC.
4.4
Receive-Only Mode
The Receive-Only mode can be used to test the connection of the bus medium. The TLE8250G can still receive
data from the bus, but the output driver stage is disabled and therefore no data can be sent to the CAN bus. All
other functions are active:
• The output driver stage is disabled and data which are available on the TxD pin are blocked and not send to
the CAN bus.
• The receiver unit is active and provides the data from the CAN bus to the RxD output pin.
• The bus basing is set to V_CC/2.
• The under-voltage monitoring on the power supply V_CC is active.
To enter the Receive-Only mode set the pin NRM to logical “Low” and the pin NEN to logical “Low” (see Table 2
or Figure 4). In case the Receive-Only mode will not be used, the NRM pin can be left open.
4.5
Stand-By Mode
Stand-By mode is an idle mode of the TLE8250G with optimized power consumption. In Stand-By mode the
TLE8250G can not send or receive any data. The output driver stage and the receiver unit are disabled. Both CAN
bus pins, CANH and CANL are floating.
• The output driver stage is disabled.
• The receiver unit is disabled.
• The bus basing is floating.
• The under-voltage monitoring on the power supply V_CC is active.
To enter the Stand-By mode set the pin NEN to logical “High”, the logical state of the NRM pin has no influence
for the mode selection (see Table 2 or Figure 4). Both pins the NEN and the NRM pin have an internal pull-up
resistor to the power-supply V_CC. If the Stand-By mode is not used in the application, the NEN pin needs to get
connected to GND.
In case the NRM pin is set to logical “Low” in Stand-By mode, the internal pull-up resistor causes an additional
quiescent current from V_CC to GND, therefore it is recommended to set the NRM pin to logical “High” in Stand-By
mode or leave the pin open if the Receive-Only mode is not used in the application.
4.6
Power Down Mode
Power Down mode means the TLE8250G is not supplied. In Power Down the differential input resistors of the
receiver stage are switched off. The CANH and CANL bus interface of the TLE8250G acts as an high impedance
input with a very small leakage current. The high ohmic input doesn’t influence the “Recessive” level of the CAN
network and allows an optimized EME performance of the whole CAN network.
Data Sheet
9
Rev. 1.1, 2014-10-09