Datasheet

26

Rev. 1.20

2022-04-27

TLE7258

LIN transceiver

Application information

6.6

RxD Pull-up resistor

The receive data output (RxD) provides an open drain behavior for allowing the output level to be adapted to

the microcontroller supply voltage. Thus 3.3 V microcontroller derivatives without 5 V tolerant ports can be

used. In case the microcontroller port pin does not provide an integrated pull-up, an external pull-up resistor

connected to the microcontroller’s VCC supply voltage is required.

The typical RxD pin current / voltage characteristic over temperature is given in Figure 17. With the

applications microcontroller port pins’ (Rx) minimum “high”-level and maximum “low”-level input voltage

the pull-up resistor can be dimensioned. For most applications a pull-up resistor RRx of 2.4 kΩ is

recommended.

Figure 17 Typical RxD output sink characteristics

Table 9

TxD termination

Operation mode

Remarks

Normal operation mode

The internal pull-up structure is active, in case the TxD input is open

the TxD input signal is “high” and the output on the BUS pin is

“recessive”

Standby mode

The internal pull-up structure is active, in case the TxD input is open

the TxD input signal is “high”. In Standby mode the transmitter is

turned off and therefore the output on the BUS pin always is

“recessive”

Sleep mode

The internal pull-up structure is inactive, in case the TxD input is open

the TxD input signal is “floating”. In sleep mode the transmitter is

turned off and therefore the output on the BUS pin always is

“recessive”

0

1

2

3

4

5

6

7

8

0

0.2

0.4

0.6

0.8

1

1.2

1.4

I

RxD

[mA]

T

j

= −40

°C

T

j

= 27

°C

T

j

= 150

°C