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TLE42994GM Datasheet(PDF) 21 Page - Infineon Technologies AG

Part # TLE42994GM
Description  Extreme Low Current Consumption In ON State
Download  36 Pages
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Manufacturer  INFINEON [Infineon Technologies AG]
Direct Link  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

TLE42994GM Datasheet(HTML) 21 Page - Infineon Technologies AG

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TLE42994
Block Description and Electrical Characteristics
Data Sheet
21
Rev. 1.2, 2014-07-03
5.6
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
trd 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 CD connected
to pin D charged by the delay capacitor charge current
I
D,ch starting from VD =0V.
If the application needs a power-on reset delay time
trd different from the value given in Power On Reset Delay
Time, the delay capacitor’s value can be derived from the specified values in Power On Reset Delay Time and
the desired power-on delay time:
(1)
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.
Reset Reaction Time:
The reset reaction time avoids that short undervoltage spikes trigger an unwanted reset “low” signal. The reset
reaction rime
t
rr considers the internal reaction time trr,int and the discharge time trr,d defined by the external delay
capacitor
C
D (see typical performance graph for details). Hence, the total reset reaction time becomes:
(2)
with
t
rr: reset reaction time
t
rr,int: internal reset reaction time
t
rr,d: reset discharge
Optional Reset Output Pull-Up Resistor
R
RO,ext:
The Reset Output RO is an open collector output with an integrated pull-up resistor. If needed, an external pull-up
resistor to the output Q can be added. In Table 7 “Electrical Characteristics Reset Function” on Page 24 a
minimum value for the external resistor
R
RO,ext is given.
CD
trd new
,
trd
---------------- 100nF
×
=
trr
trd int
,
trr d
,
+
=


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