TLE 4263

Data Sheet

11

Rev. 2.8, 2007-03-20

Reset Switching Threshold

The present default value is typ. 4.65 V. When using the TLE 4263 the reset threshold

can be set to 3.5 V <

V

The calculation can be easily done since the reset adjust input current can be neglected.

If this feature is not needed, the pin has to be connected to GND.

V

(2)

Definitions:

•

V

•

V

Watchdog Timing

The frequency of the watchdog pulses has to be higher than the minimum pulse

sequence which is set by the external reset delay capacitor

C

according to the formula given in Figure 6.

Figure 6

Timing of the Watchdog Function Reset

AED03099_4263

W

V

V

V

Q

D

V

V

RO

WD, L

t

WD, p

T

WI, tr

T

T

=

V

V

Ι

D, wd

DU

V

V

DWL

Ι

WI, tr

D

C

t

t

t

t

t