TLE7257

Application Information

Data Sheet

26

Rev. 1.0, 2013-10-16

7.6

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

V

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

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