TLE8458

Mode Control

Data Sheet

9

Rev. 1.1, 2014-04-01

5.2

Description of Mode Control

The TLE8458 has 4 major operation modes:

•

Normal Operation Mode

•

Stand-By Mode

•

Sleep Mode

•

Stop Mode

The Normal Operation mode contains 2 sub-operation modes, which differentiate by the slew rate control of the

LIN Bus signal (see Figure 3).

Sub-operation modes with different slew rates on the BUS pin:

•

Normal Slope Mode, for data transmission rates up to 20 kBaud

•

Software Flash mode, for programming of the external microcontroller

The operation mode of the TLE8458 is selected by the EN pin and the TxD pin. (see Table 5, see Figure 4).

Table 5

Operation Modes

Mode

EN

TxD

RxD

V

CC

LIN Bus

Termination

Comments

Normal Operation

Mode

HIGH

LOW

1) The TxD pin acts as an input

LOW

HIGH

ON

30 k

Ω

(typical)

TxD drives the data to the bus,

RxD indicates the data on the

bus.

Stand-By Mode

LOW

LOW

2) The TxD pin acts as an output and indicates the Wake-up source.The TxD input needs an external termination to indicate

a HIGH or a LOW signal. The external termination could be a pull-up resistor or an active microcontroller output.

LOW

HIGH

ON

30 k

Ω

(typical)

In Stand-By Mode the RxD and

TxD pins indicate the Wake-up

source

Sleep Mode

LOW

HIGH

Float

OFF

High

Impedance

For Sleep Mode TxD needs to

be HIGH for the time

t

mode1

Stop Mode

LOW

LOW

Float

ON

High

Impedance

For Stop Mode TxD needs to be

LOW for the time

t

mode1