TLE 42694E Infineon Technologies, TLE 42694E Datasheet - Page 17

• Manufacturer Part Number: TLE 42694E
• Manufacturer: Infineon Technologies

Specifications of TLE 42694E

• Packages: PG-SSOP-14
• Regulator Type: single output
• Output Voltage: 5V
• Accuracy: 2.0 %
• Max. Output Current: 100mA
• Dropout Voltage: 250mV

5.3
The reset function provides 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 low supply voltage.
Power-On Reset Delay Time:
The power-on reset delay time
from exceeding the reset switching threshold
“low” to “high”. The power-on reset delay time
charged by the delay capacitor charge current
If the application needs a power-on reset delay time
capacitor’s value can be derived from the specified values in
with
•
•
•
For a precise calculation also take the delay capacitor’s tolerance into consideration.
Reset Reaction Time:
The reset reaction time avoids that short undervoltage spikes trigger an unwanted reset “low” signal. The reset
reaction rime
capacitor
with
•
•
•
Optional Reset Output Pull-Up Resistor
The Reset Output RO is an open collector output with an integrated pull-up resistor. To improve the EMC
behaviour of the component, an external pull-up resistor to the output
Characteristics Reset Function” on Page 21
Data Sheet
C
t
t
t
t
t
rd,new
rr
rr,int
rd
rr,d
D
: reset reaction time
: power-on reset delay time specified in this datasheet
: capacitance of the delay capacitor to be chosen
: reset discharge
: internal reset reaction time
: desired power-on reset delay time
C
C
D
t
D
rr
=
Reset Function
(see typical performance graph for details). Hence, the total reset reaction time becomes:
t
=
rr
t
----------------
rd new
t
considers the internal reaction time
rd int
t
,
rd
,
×
+
100nF
t
rr d ,
t
rd
allows a microcontoller and oscillator to start up. This delay time is the time frame
R
RO,ext
V
RT
t
I
rd
D,ch
a minimum value for the external resistor
until the reset is released by switching the reset output “RO” from
is defined by an external delay capacitor
:
starting from
t
rr,int
t
17
rd
and the discharge time
different from the value given in
Block Description and Electrical Characteristics
Item 5.3.8
V
D
= 0 V.
and the desired power-on delay time:
V
Q
can be added. In
t
rr,d
defined by the external delay
R
C
RO,ext
Rev. 1.2, 2010-11-26
Item
D
connected to pin D
Table “Electrical
is given.
5.3.8, the delay
TLE42694