Data Sheet

7

Rev. 1.11

2016-12-29

TLE8250GVIO

High Speed CAN-Transceiver

Functional Description

The TLE8250GVIO is a High Speed CAN transceiver, operating as an interface between the CAN controller and

the physical bus medium. A HS CAN network is a two wire, differential network which allows data transmission

rates up to 1 MBit/s. Characteristic for a HS CAN network are the two signal states on the CAN bus: “Dominant”

and “Recessive” (see Figure 3).

The pins CANH and CANL are the interface to the CAN bus and both pins operate as a input and as an output.

The pins RxD and TxD are the interface to the microcontroller. The pin TxD is the serial data input from the CAN

controller, the pin RxD is the serial data output to the CAN controller. As shown in Figure 1, the HS CAN

transceiver TLE8250GVIO has a receive and a transmit unit, allowing the transceiver to send data to the bus

medium and monitor the data from the bus medium at the same time. The HS CAN transceiver TLE8250GVIO

converts the serial data stream available on the transmit data input TxD, into a differential output signal on

CAN bus, provided by the pins CANH and CANL. The receiver stage of the TLE8250GVIO monitors the data on

the CAN bus and converts them to a serial, single ended signal on the RxD output pin. A logical “Low” signal on

the TxD pin creates a “Dominant” signal on the CAN bus, followed by a logical “Low” signal on the RxD pin (see

Figure 3). The feature, broadcasting data to the CAN bus and listening to the data traffic on the CAN bus

simultaneous is essential to support the bit to bit arbitration inside CAN networks.

The voltage levels for HS CAN transceivers are defined by the ISO 11898-2 and the ISO 11898-5 standards. If a

data bit is “Dominant” or “Recessive” depends on the voltage difference between pins CANH and CANL:

In comparison to other differential network protocols the differential signal on a CAN network can only be

Partially supplied CAN networks are networks where the CAN bus participants have different power supply

conditions. Some nodes are connected to the power supply, some other nodes are disconnected from the

power supply. Regardless, if the CAN bus participant is supplied or not supplied, each participant connected

to the common bus media must not disturb the communication. The TLE8250GVIO is designed to support

partially supplied networks. In Power Down mode, the receiver input resistors are switched off and the

transceiver input is high resistive.

The voltage level on the digital input TxD and the digital output RxD is determined by the power supply level

is connected to same power supply as I/O power supply of the microcontroller.

4.2

Operation Modes

Two different operation modes are available on TLE8250GVIO. Each mode with specific characteristics in

terms of quiescent current or data transmission. For the mode selection the digital input pin NEN is used.

the TLE8250GVIO to Stand-By per default. If the microcontroller is up and running the TLE8250GVIO can