TLE4675

Reset Function

Data Sheet

16

Rev. 1.0, 2008-09-30

7

Reset Function

7.1

Description Reset Function

The reset function contains several features:

Output Undervoltage Reset:

An output undervoltage condition is indicated by setting the reset output “RO” to “low”. This signal might be used

to reset a microcontroller during a low supply voltage condition.

Power-On Reset Delay Time

The power-on reset delay time

t

time period from exceeding the upper reset switching threshold

V

reset output “RO” from “low” to “high”. The power-on reset delay time

t

capacitor

C

V

In case a power-on reset delay time

t

capacitor’s value can be derived from the specified value given in Item 7.2.15:

with

•

t

•

t

•

C

The formula is valid for

C

Undervoltage Reset Delay Time

Unlike the power-on reset delay time, the undervoltage reset delay

t

event, where the delay capacitor

C

sequence starts. Therefore, the undervoltage reset delay time

t

current

I

A delay capacitor CD for a different undervoltage reset delay time as specified in Item 7.2.14 can be calculated

similar as above:

with

•

t

•

t

•

C

The formula is valid for

C

----------------------------------- 100

×

nF

=

---------------- 100

×

nF

=