TLE7250LE

TLE7250SJ

Functional Description

Data Sheet

9

Rev. 1.0, 2015-08-12

The TLE7250 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).

V

CC and GND are the supply pins for the TLE7250. The pins CANH and CANL are the interface to the 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 NEN and NRM pins are the input pins

for the mode selection (see Figure 4).

By setting the TxD input pin to logical “low” the transmitter of the TLE7250 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 (

V

Diff = VCANH - VCANL).

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 (

V

Diff) between CANH and CANL above 0.9 V as “dominant” and below 0.5 V as “recessive”.

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

t

Loop ≤ 255 ns.