TLE6251-2G Datasheet, PDF (10/35 Pages) Infineon Technologies AG – High Speed CAN-Transceiver with Wake and Failure Detection

TLE6251-2G
Operation Modes
In Sleep mode the power supply V_CC and the logic power supply V_IO are usually turned off. A Wake - Up event, via
the CAN bus or the local Wake - Up pin, shifts the device from Sleep Mode into Stand - By Mode.
The following operations mode are available on the TLE6251-2G:
• Normal Operation Mode
• Receive - Only Mode
• Stand - By Mode
• Sleep Mode
• Go - To - Sleep Command
Depending on the operation mode, the output driver stage, the receiver stage, the split termination and the bus
biasing are active or inactive. Table 1 shows the different operation modes depending on the logic signal on the
pins EN and NSTB with the related status of the INH pin, the SPLIT pin and the bus biasing.
Table 1 Overview Operation Modes
Operation Mode
EN
Normal Operation
1
Receive - Only
0
Stand - By
0
Go - To - Sleep
1
Sleep
0
All Power Supplies off
0
NSTB
1
1
0
0
0
0
INH
V_S
V_S
V_S
V_S
Floating
Floating
Bus Bias
V_CC/2
V_CC/2
GND
GND
GND
Floating
SPLIT
V_CC/2
V_CC/2
Floating
Floating
Floating
Floating
5.1
Normal Operation Mode
In Normal Operation Mode the HS CAN transceiver TLE6251-2G 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 is monitored on the RxD output pin. In
Normal Operation Mode all functions of the TLE6251-2G are active:
• The output driver stage is active and drives data from the TxD to the CAN bus.
• The normal receiver unit is active and provides the data from the CAN bus to the RxD pin.
• The low power receiver and the bus Wake - Up function is inactive.
• The local Wake-Up pin is disabled.
• The INH pin is connected to V_S.
• The RxD pin is “Low” for a “Dominant” bus signal and “High” for a “Recessive” bus signal”
• The SPLIT pin is set to V_CC/2.
• The bus basing is set to V_CC/2.
• The failure detection is active and failures are indicated at the NERR pin. (see Chapter 8).
• The undervoltage detection on the all 3 power supplies V_CC, V_IO and V_S is active.
The HS CAN transceiver TLE6251-2G enters Normal Operation Mode by setting the mode selection pins EN and
NSTB to logical “High” (see Table 1 or Figure 4).
5.2
Receive - Only Mode
The Receive - Only Mode can be used to test the connection of the bus medium. The TLE6251-2G 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 is available on the TxD pin will be blocked and not
communicated to the CAN bus.
• The normal receiver unit is active and provides the data which is available on the CAN bus to the RxD pin.
• The INH pin is connected to V_S.
• The RxD pin is “Low” for a “Dominant” bus signal and “High” for a “Recessive” bus signal.
Data Sheet
10
Rev. 1.0, 2009-05-07