TLE7250LE

TLE7250SJ

Functional Description

Data Sheet

13

Rev. 1.0, 2015-08-12

4.3.3

Undervoltage on the Transmitter Supply

V

CC

In case the transmitter supply

V

CC falls below the threshold VCC < VCC(UV,F), the transceiver TLE7250 can not

provide the correct bus levels to the CANH and CANL anymore. The normal-mode receiver is powered by the

transmitter supply

V

CC. In case of insufficient VCC supply the TLE7250 can neither transmit the CANH and CANL

signals correctly to bus nor can it receive them properly. Therefore the TLE7250 powers down and blocks both,

the transmitter and the receiver.

The transceiver TLE7250 powers up again, when the transmitter supply

V

CC recovers from the undervoltage

condition.

Figure 6

Undervoltage on the transmitter supply

V

CC

power-down state

tDelay(UV) delay time undervoltage

any mode of operation

VCC

hysteresis

VCC(UV,H)

t

power-save mode

t

NEN

“X” = don’t care

“high” due the internal

pull-up resistor1)

VCC undervoltage monitor

VCC(UV,F)

VCC undervoltage monitor

VCC(UV,R)

t

NRM

“X” = don’t care

“high” due the internal

pull-up resistor1)

1) assuming no external signal applied