TLE6251D

Functional Description

Data Sheet

8

Rev. 1.0, 2012-07-27

4.2

Modes of Operation

Two different modes of operation are available on the TLE6251D. Each mode has specific characteristics in terms

of quiescent current or data transmission. The digital input pin STB is used for the mode selection. Figure 4

illustrates the different mode changes depending on the status of the STB pin. After supplying

V

HS CAN transceiver, the TLE6251D starts in stand-by mode. The internal pull-up resistor at the STB pin sets the

TLE6251D to stand-by mode by default. If the microcontroller is up and running, the TLE6251D can switch to any

operating mode within the time period for mode change

t

Figure 4

Mode of operation

The TLE6251D has 2 major modes of operation:

•

Stand-by mode

•

Normal-operating mode

undervoltage

power-down

start–up

STB = 0

normal-operating

mode

STB = 1

stand-by mode

STB = 0

STB = 1

Table 2

Modes of Operation

Mode

STB

Bus Bias

Comment

Normal-

operating mode

“low”

V

The transmitter is active.

The normal mode receiver is active.

The low-power receiver is disabled.

Stand-by mode

V

V

“high”

GND

The transmitter is disabled.

The normal mode receiver is disabled.

The low-power receiver is active.

Stand-by mode

V

V

“high”

GND

The transmitter is disabled.

The normal mode receiver is disabled.

The low-power receiver is active.

Power-down

state

V

V

Don’t care

Floating

The transmitter is disabled.

The normal mode receiver is disabled.

The low-power receiver is disabled.