Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

ADM8692 Datasheet(PDF) 15 Page - Analog Devices

Part No. ADM8692
Description  Microprocessor Supervisory Circuits
Download  20 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  AD [Analog Devices]
Homepage  http://www.analog.com
Logo 

ADM8692 Datasheet(HTML) 15 Page - Analog Devices

Zoom Inzoom in Zoom Outzoom out
 15 / 20 page
background image
ADM8690/ADM8691/ADM8692/ADM8693/ADM8695
Rev. B | Page 15 of 20
ALTERNATE WATCHDOG INPUT DRIVE CIRCUITS
The watchdog feature can be enabled and disabled under
program control by driving WDI with a three-state buffer (see
Figure 28). When three-stated, the WDI input floats, thereby
disabling the watchdog timer.
WDI
ADM869x
WATCHDOG
STROBE
CONTROL
INPUT
Figure 28. Programming the Watchdog Input
This circuit is not entirely foolproof, and it is possible for a
software fault to erroneously three-state the buffer preventing
the ADM869x from detecting that the microprocessor is no
longer operating correctly. In most cases, a better method is to
extend the watchdog period rather than disable the watchdog.
This can be done under program control using the circuit
shown in Figure 29. When the control input is high, the
OSC SEL pin is low and the watchdog timeout is set by the
external capacitor. A 0.01 µF capacitor sets a watchdog time-
out delay of 100 seconds. When the control input is low, the
OSC SEL pin is driven high, selecting the internal oscillator.
The 100 ms or the 1.6 s period is chosen, depending on which
diode is used, as shown in Figure 29. With D1 inserted, the
internal timeout is set at 100 ms; with D2 inserted, the timeout
is set at 1.6 seconds.
ADM869x
OSC SEL
OSC IN
CONTROL
INPUT1
1LOW = INTERNAL TIMEOUT
HIGH = EXTERNAL TIMEOUT
D1
D2
Figure 29. Programming the Watchdog Input


Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20 


Datasheet Download




Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Alldatasheet API   |   Link Exchange   |   Manufacturer List
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