Data Sheet

9

Rev. 1.0, 2015-09-10

TLE7251VLE

TLE7251VSJ

Functional Description

The TLE7251V 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

for CAN FD frames up to 2 MBit/s. Characteristic for HS CAN networks are the two signal states on the HS CAN

bus: “dominant” and “recessive” (see Figure 3).

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HS CAN bus and operate in both directions, as an input and as an output. RxD and TxD pins are the interface to

the CAN controller, the TxD pin is an input pin and the RxD pin is an output pin. The STB pin is the input pin for

the mode selection (see Figure 4).

By setting the TxD input pin to logical “low” the transmitter of the TLE7251V drives a “dominant” signal to the CANH

and CANL pins. Setting TxD input to logical “high” turns off the transmitter and the output voltage on CANH and

CANL discharges towards the “recessive” level. The “recessive” output voltage is provided by the bus biasing (see

Figure 1). The output of the transmitter is considered to be “dominant”, when the voltage difference between

CANH and CANL is at least higher than 1.5 V (

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Parallel to the transmitter the normal-mode receiver monitors the signal on the CANH and CANL pins and indicates

it on the RxD output pin. A “dominant” signal on the CANH and CANL pins sets the RxD output pin to logical “low”,

vice versa a “recessive” signal sets the RxD output to logical “high”. The normal-mode receiver considers a voltage

difference (

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To be conform with HS CAN features, like the bit to bit arbitration, the signal on the RxD output has to follow the

signal on the TxD input within a defined loop delay

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The thresholds of the digital inputs (TxD and STB) and also the RxD output voltage are adapted to the digital power

supply

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