TLE 4471G Infineon Technologies, TLE 4471G Datasheet - Page 19

• Manufacturer Part Number: TLE 4471G
• Manufacturer: Infineon Technologies

Specifications of TLE 4471G

• Packages: PG-DSO-20
• Regulator Type: multiple output
• Output Voltage: 5Vtrackertracker
• Accuracy: 2.0 %0.5 %0.5 %
• Max. Output Current: 450mA100mA50mA
• Dropout Voltage: 250mV

Watchdog
The reset and watchdog timing can be defined independently of each other by two delay
capacitors
The watchdog function supervises the microcontroller including time base failures. If
there is no positive edge within a certain pulse repetition time
too short a reset is generated. Programming of the max. repetition time is done by a
delay capacitor
The frequency of the watchdog pulses generated by the microcontroller has to be higher
than the minimum pulse sequence
pulse repetition time can be calculated as follows:
Figure 7
If the watchdog is not used in an application the pin WD has to be connected to GND.
Data Sheet
t
wp
V
V
V
=
V
V
DW
DR
V
Q1
W
R
I
C
DW
C
DR
V
------------------------------------- -
Watchdog Timing
DW dt
and
C
DW
I
,
DW ch
C
–
at pin DW.
t
,
DW
> 10 µs
V
DW st
at pins DR and DW.
,
t
wp
t
set by the external reset delay capacitor
>
25 µs
Missing edge
at Watchdog
19
t
WP
t
dr
Watchdog pulses
too short
t
wp
or the trigger pulse is
Rev. 1.6, 2009-02-03
t
rr
TLE 4471
t
t
t
t
t
t
AET03000
C
V
V
V
V
DW
DW,dt
DW,st
DR,dt
DR,st
. The
(4)