Zakładka z wyszukiwarką danych komponentów
  Polish  ▼
ALLDATASHEET.PL

X  

ADM692AN Arkusz danych(PDF) 10 Page - Analog Devices

Numer części ADM692AN
Szczegółowy opis  Microprocessor Supervisory Circuits
Download  16 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
Logo AD - Analog Devices

ADM692AN Arkusz danych(HTML) 10 Page - Analog Devices

Back Button ADM692AN Datasheet HTML 6Page - Analog Devices ADM692AN Datasheet HTML 7Page - Analog Devices ADM692AN Datasheet HTML 8Page - Analog Devices ADM692AN Datasheet HTML 9Page - Analog Devices ADM692AN Datasheet HTML 10Page - Analog Devices ADM692AN Datasheet HTML 11Page - Analog Devices ADM692AN Datasheet HTML 12Page - Analog Devices ADM692AN Datasheet HTML 13Page - Analog Devices ADM692AN Datasheet HTML 14Page - Analog Devices Next Button
Zoom Inzoom in Zoom Outzoom out
 10 / 16 page
background image
ADM690–ADM695
REV. A
–10–
+APPLICATION INFORMATION
Increasing the Drive Current
If the continuous output current requirements at VOUT exceed
100 mA or if a lower VCC–VOUT voltage differential is desired,
an external PNP pass transistor may be connected in parallel
with the internal transistor. The BATT ON output (ADM691/
ADM693/ADM695) can directly drive the base of the external
transistor.
V
OUT
V
CC
BATTERY
+5V
INPUT
POWER
0.1
µF
0.1
µF
BATT
ON
V
BATT
PNP TRANSISTOR
ADM691
ADM693
ADM695
Figure 17. Increasing the Drive Current
Using a Rechargeable Battery for Back Up
If a capacitor or a rechargeable battery is used for back up then
the charging resistor should be connected to VOUT since this
eliminates the discharge path that would exist during power
down if the resistor is connected to VCC.
V
OUT
V
CC
RECHARGEABLE
BATTERY
+5V
INPUT
POWER
0.1
µF
0.1
µF
V
BATT
ADM69x
R
I =
VOUT – VBATT
R
Figure 18. Rechargeable Battery
Adding Hysteresis to the Power Fail Comparator
For increased noise immunity, hysteresis may be added to the
power fail comparator. Since the comparator circuit is nonin-
verting, hysteresis can be added simply by connecting a resistor be-
tween the PFO output and the PFI input as shown in Figure 19.
When PFO is low, resistor R3 sinks current from the summing
junction at the PFI pin. When PFO is high, the series combina-
tion of R3 and R4 source current into the PFI summing junc-
tion. This results in differing trip levels for the comparator.
ADM69x
R
2
1.3V
PFO
R
1
7805
R
4
R
3
+7V TO +15V
INPUT
POWER
+5V
PFI
V
CC
TO
µP NMI
5V
0V
0V
V
L
V
H
V
IN
PFO
V
H
= 1.3V
(1+ ––– + ––– )
V
L
= 1.3V
(1+ ––– – –––––––––––––)
ASSUMING R
4
< <
R
3
THEN
HYSTERESIS V
H
– V
L
= 5V
(––– )
R
1
R
2
R
1
R
3
R
1
R
2
R
1
R
2
R
1
(5V – 1.3V)
1.3V (R
3 +
R
4
)
Figure 19. Adding Hysteresis to the Power Fail Comparator
Monitoring the Status of the Battery
The power fail comparator can be used to monitor the status of
the backup battery instead of the power supply if desired. This
is shown in Figure 20. The PFI input samples the battery volt-
age and generates an active low PFO signal when the battery
voltage drops below a chosen threshold. It may be necessary to
apply a test load in order to determine the loaded battery volt-
age. This can be done under processor control using CEOUT.
Since CEOUT is forced high during the battery backup mode, the
test load will not be applied to the battery while it is in use, even
if the microprocessor is not powered.


Podobny numer części - ADM692AN

ProducentNumer częściArkusz danychSzczegółowy opis
logo
Analog Devices
ADM692AN AD-ADM692AN Datasheet
199Kb / 16P
   Microprocessor Supervisory Circuits
REV. A
ADM692AN AD-ADM692AN Datasheet
291Kb / 16P
   Microprocessor Supervisory Circuits
REV. A
ADM692AN AD-ADM692AN Datasheet
291Kb / 16P
   Microprocessor Supervisory Circuits
REV. A
ADM692AN AD-ADM692AN Datasheet
291Kb / 16P
   Microprocessor Supervisory Circuits
REV. A
ADM692AN AD-ADM692AN Datasheet
175Kb / 16P
   Microprocessor Supervisory Circuits
REV. A
More results

Podobny opis - ADM692AN

ProducentNumer częściArkusz danychSzczegółowy opis
logo
Linear Technology
LTC690 LINER-LTC690 Datasheet
141Kb / 16P
   Microprocessor Supervisory Circuits
logo
Maxim Integrated Produc...
MAX690 MAXIM-MAX690 Datasheet
626Kb / 16P
   Microprocessor Supervisory Circuits
Rev 2; 4/95
MAX690A MAXIM-MAX690A Datasheet
98Kb / 12P
   Microprocessor Supervisory Circuits
Rev 3; 9/93
logo
Analog Devices
ADM690A AD-ADM690A Datasheet
327Kb / 8P
   Microprocessor Supervisory Circuits
REV. 0
ADM8690ADM8695 AD-ADM8690ADM8695 Datasheet
183Kb / 16P
   Microprocessor Supervisory Circuits
REV. 0
ADM8698 AD-ADM8698 Datasheet
95Kb / 4P
   Microprocessor Supervisory Circuits
REV. 0
ADM805LM AD-ADM805LM_15 Datasheet
334Kb / 8P
   Microprocessor Supervisory Circuits
REV. 0
ADM692A AD-ADM692A_15 Datasheet
334Kb / 8P
   Microprocessor Supervisory Circuits
REV. 0
ADM693 AD-ADM693_15 Datasheet
291Kb / 16P
   Microprocessor Supervisory Circuits
REV. A
ADM706P AD-ADM706P_15 Datasheet
333Kb / 16P
   Microprocessor Supervisory Circuits
REV. D
logo
Linear Technology
LTC691 LINER-LTC691_15 Datasheet
270Kb / 20P
   Microprocessor Supervisory Circuits
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16


Arkusz danych Pobierz

Go To PDF Page


Link URL




Polityka prywatności
ALLDATASHEET.PL
Czy Alldatasheet okazała się pomocna?  [ DONATE ] 

O Alldatasheet   |   Reklama   |   Kontakt   |   Polityka prywatności   |   Linki   |   Lista producentów
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com