tle4675 Infineon Technologies Corporation, tle4675 Datasheet - Page 16

• Manufacturer Part Number: tle4675
• Description: Low Drop Out Linear Voltage Regulator 5v Fixed Output Voltage
• Manufacturer: Infineon Technologies Corporation

7
7.1
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
time period from exceeding the upper reset switching threshold
reset output “RO” from “low” to “high”. The power-on reset delay time
capacitor
V
In case a power-on reset delay time
capacitor’s value can be derived from the specified value given in
with
•
•
•
The formula is valid for
Undervoltage Reset Delay Time
Unlike the power-on reset delay time, the undervoltage reset delay
event, where the delay capacitor
sequence starts. Therefore, the undervoltage reset delay time
current
A delay capacitor CD for a different undervoltage reset delay time as specified in
similar as above:
with
•
•
•
The formula is valid for
Data Sheet
C
C
D
D
D
= 0 V.
t
t
C
t
t
C
d,PWR-ON
d,PWR-ON,100nF
d
d,100nF
D
: Desired reset delay time
D
=
=
: Delay capacitor required
: Delay capacitor required
I
D,ch
---------------------------------- -
t
--------------- -
t
d,PWR-ON,100nF
d,100nF
C
: Reset delay time specified in
D
t
t
: Desired power-on reset delay time
starting from
d,PWR-ON
d
Reset Function
Description Reset Function
connected to pin “D”, which is charged up by the delay capacitor charge current
: Power-on reset delay time specified in
100nF
C
C
D
D
V
D
100nF
10nF.For a precise calculation consider also the delay capacitor’s tolerance.
=
10nF.For a precise calculation consider also the delay capacitor’s tolerance.
V
t
d,PWR-ON
DST,lo
C
D
and the external delay capacitor
t
is assumed to be discharged to
d,PWR-ON
Item 7.2.14
allows a microcontroller and oscillator to start up. This delay time is the
different from the value for
16
Item 7.2.15
V
RT,hi
Item
t
d
t
d
is defined by the delay capacitor charge
time considers a short output undervoltage
until the reset is released by switching the
C
7.2.15:
t
D
d,PWR-ON
.
V
D
C
=
D
V
= 100nF is required, the delay
DST,lo
is defined by an external delay
Item 7.2.14
only before the charging
Rev. 1.0, 2008-09-30
can be calculated
I
D,ch
Reset Function
starting from
TLE4675