Data Sheet

8

Rev. 1.1, 2013-07-22

TLE7250G

Functional Description

4.2

Modes of Operation

Three different modes of operation are available on the TLE7250G. Each mode has specific characteristics in

terms of quiescent current or data transmission. NEN and NRM are used as the digital input pins for mode

selection. Figure 4 illustrates the different mode changes depending on the status of the NEN and NRM pins. After

supplying

V

set the TLE7250G to stand-by mode by default. If the microcontroller is up and running, the TLE7250G can switch

to any mode of operation within the time period for mode change

t

Figure 4

Modes of operation

The TLE7250G has 3 major modes of operation:

•

Stand-by mode

•

Normal-operating mode

•

Receive-only mode

Table 2

Modes of Operation

Mode

NRM

NEN

Bus Bias

Comments

Normal-operating

mode

“high”

“low”

V

The transmitter is active.

The receiver is active.

Stand-by

“low”

or

“high”

“high”

GND

The transmitter is disabled.

The receiver is disabled.

Receive-only

“low”

“low”

V

The transmitter is disabled.

The receiver is active.

V

“low”

or

“high”

“low”

or

“high”

floating

The transmitter is disabled.

The receiver is disabled.

NRM = 0

NEN = 0

NRM = 1

NEN = 0

undervoltage

power-down

start–up

NEN = 1

stand-by mode

NRM = 0/1

NEN = 0

NRM = 1

NEN = 0

receive-only mode

NRM = 0

NRM = 0

NEN = 0

NRM = 0/1

NEN = 1

NRM = 0/1

NEN = 1

NRM = 1

NEN = 0

normal-operating

mode