Datasheet

TLE42994
Block Description and Electrical Characteristics
Data Sheet 18 Rev. 1.1, 2009-05-19
5.6 Enable Function (only TLE42994GM and TLE42994E)
5.7 Reset Function
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
t
rd
allows a microcontoller and oscillator to start up. This delay time is the time frame
from exceeding the reset switching threshold
V
RT
until the reset is released by switching the reset output “RO” from
“low” to “high”. The power-on reset delay time
t
rd
is defined by an external delay capacitor C
D
connected to pin D
charged by the delay capacitor charge current
I
D,ch
starting from V
D
=0V.
If the application needs a power-on reset delay time
t
rd
different from the value given in Item 5.7.8, the delay
capacitor’s value can be derived from the specified values in Item 5.7.8 and the desired power-on delay time:
with
•
C
D
: capacitance of the delay capacitor to be chosen
•
t
rd,new
: desired power-on reset delay time
•
t
rd
: power-on reset delay time specified in this datasheet
For a precise calculation also take the delay capacitor’s tolerance into consideration.
Electrical Characteristics Voltage Regulator
V
I
= 13.5 V, -40 °C ≤ T
j
≤150 °C, all voltages with respect to ground, positive current flowing into pin
(unless otherwise specified)
Pos. Parameter Symbol Limit Values Unit Conditions
Min. Typ. Max.
5.6.1 Enable OFF Voltage Range
V
EN,OFF
––0.8V–
5.6.2 Enable ON Voltage Range
V
EN,ON
3.5 – – V –
5.6.3 Enable OFF Input Current
I
EN,OFF
–0.52µAV
EN
=0V
5.6.4 Enable ON Input Current
I
EN,ON
–35µAV
EN
=5V
C
D
t
rd new,
t
rd
----------------
100nF×=