công cụ tìm kiếm bảng dữ liệu linh kiện điện tử
  Vietnamese  ▼
ALLDATASHEET.VN

X  

ADM705AN bảng dữ liệu(PDF) 8 Page - Analog Devices

tên linh kiện ADM705AN
Giải thích chi tiết về linh kiện  Supervisory Circuits
Download  12 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
nhà sản xuất  AD [Analog Devices]
Trang chủ  http://www.analog.com
Logo AD - Analog Devices

ADM705AN bảng dữ liệu(HTML) 8 Page - Analog Devices

Back Button ADM705AN Datasheet HTML 4Page - Analog Devices ADM705AN Datasheet HTML 5Page - Analog Devices ADM705AN Datasheet HTML 6Page - Analog Devices ADM705AN Datasheet HTML 7Page - Analog Devices ADM705AN Datasheet HTML 8Page - Analog Devices ADM705AN Datasheet HTML 9Page - Analog Devices ADM705AN Datasheet HTML 10Page - Analog Devices ADM705AN Datasheet HTML 11Page - Analog Devices ADM705AN Datasheet HTML 12Page - Analog Devices  
Zoom Inzoom in Zoom Outzoom out
 8 / 12 page
background image
ADM705/ADM706/ADM707/ADM708
Rev. G | Page 8 of 12
CIRCUIT INFORMATION
POWER-FAIL RESET OUTPUT
RESET is an active low output that provides a reset signal to
the microprocessor whenever the VCC input is below the reset
threshold. An internal timer holds RESET low for 200 ms after
the voltage on VCC rises above the threshold. This functions as a
power-on reset signal for the microprocessor. It allows time for
both the power supply and the microprocessor to stabilize after
power-up. The RESET output is guaranteed to remain valid
(low) with VCC as low as 1 V. This ensures that the micropro-
cessor is held in a stable shutdown condition as the power
supply voltage ramps up.
In addition to RESET, an active high RESET output is also
available on the ADM707/ADM708. This is the complement
of RESET and is useful for processors requiring an active high
reset signal.
MANUAL RESET
The manual reset input (MR) allows other reset sources, such
as a manual reset switch, to generate a processor reset. The
input is effectively debounced by the timeout period (200 ms
typical). The MR input is TTL-/CMOS-compatible, so it can
also be driven by any logic reset output.
VCC
RESET
MR
WDO
VRT
MR EXTERNALLY
DRIVEN LOW
VRT
tRS
tRS
Figure 13. RESET, MR, and WDO Timing
WATCHDOG TIMER (ADM705/ADM706)
The watchdog timer circuit can be used to monitor the activity of
the microprocessor to check that it is not stalled in an indefinite
loop. An output line on the processor is used to toggle the watch-
dog input (WDI) line. If this line is not toggled within the timeout
period (1.60 sec), then the watchdog output (WDO) goes low.
The WDO can be connected to a nonmaskable interrupt (NMI)
on the processor; therefore, if the watchdog timer times out, an
interrupt is generated. The interrupt service routine should then
be used to rectify the problem.
If a RESET signal is required when a timeout occurs, the WDO
should be connected to the manual reset input (MR).
The watchdog timer is cleared by either a high-to-low or a low-
to-high transition on WDI. It is also cleared by RESET going
low; therefore, the watchdog timeout period begins after RESET
goes high.
When VCC falls below the reset threshold, WDO is forced low
whether or not the watchdog timer has timed out. Normally, this
generates an interrupt, but it is overridden by RESET going low.
The watchdog monitor can be deactivated by floating the
watchdog input (WDI). The WDO can then be used as a low
line output, because it goes low only when VCC falls below the
reset threshold.
tWP
WDI
WDO
RESET
tRS
RESET EXTERNALLY
TRIGGERED BY MR
tWD
tWD
tWD
Figure 14. Watchdog Timing
POWER-FAIL COMPARATOR
The power-fail comparator is an independent comparator that
can be used to monitor the input power supply. The comparator’s
inverting input is internally connected to a 1.25 V reference
voltage. The noninverting input is available at the PFI input.
This input can be used to monitor the input power supply via
a resistive divider network. When the voltage on the PFI input
drops below 1.25 V, the comparator output (PFO) goes low,
indicating a power failure. For early warning of power failure,
the comparator can be used to monitor the preregulator input
simply by choosing an appropriate resistive divider network.
The PFO output can be used to interrupt the processor so that
a shutdown procedure is implemented before power is lost.
INPUT
POWER
R1
R2
POWER-FAIL
INPUT
1.25V
PFI
PFO
POWER-FAIL
OUTPUT
ADM705/ADM706/
ADM707/ADM708
Figure 15. Power-Fail Comparator


Số phần tương tự - ADM705AN

nhà sản xuấttên linh kiệnbảng dữ liệuGiải thích chi tiết về linh kiện
logo
Analog Devices
ADM705AN AD-ADM705AN Datasheet
143Kb / 8P
   Low Cost uP Supervisory Circuits
REV. B
ADM705AN AD-ADM705AN Datasheet
338Kb / 12P
   Low Cost Microprocessor Supervisory Circuits
Rev. G
ADM705AN AD-ADM705AN Datasheet
338Kb / 12P
   Low Cost Microprocessor Supervisory Circuits
Rev. G
ADM705AN AD-ADM705AN Datasheet
410Kb / 12P
   Low Cost Microprocessor Supervisory Circuits
Rev. H
ADM705ANZ AD-ADM705ANZ Datasheet
338Kb / 12P
   Low Cost Microprocessor Supervisory Circuits
Rev. G
More results

Mô tả tương tự - ADM705AN

nhà sản xuấttên linh kiệnbảng dữ liệuGiải thích chi tiết về linh kiện
logo
ON Semiconductor
CAT1163WI28 ONSEMI-CAT1163WI28 Datasheet
143Kb / 12P
   Supervisory Circuits with Supervisory Circuits with
November, 2011 ??Rev. 10
logo
Micrel Semiconductor
MIC705 MICREL-MIC705 Datasheet
177Kb / 8P
   Supervisory Circuits
logo
ON Semiconductor
N84C163 ONSEMI-N84C163_18 Datasheet
212Kb / 13P
   Supervisory Circuits
May, 2018 ??Rev. 1
N84C161 ONSEMI-N84C161_18 Datasheet
212Kb / 13P
   Supervisory Circuits
May, 2018 ??Rev. 1
CAT1024 ONSEMI-CAT1024_18 Datasheet
404Kb / 23P
   Supervisory Circuits
May, 2018 ??Rev. 21
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
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12


bảng dữ liệu tải về

Go To PDF Page


Link URL




Chính sách bảo mật
ALLDATASHEET.VN
Cho đến nay ALLDATASHEET có giúp ích cho doanh nghiệp của bạn hay không?  [ DONATE ] 

Alldatasheet là   |   Quảng cáo   |   Liên lạc với chúng tôi   |   Chính sách bảo mật   |   Trao đổi link   |   Tìm kiếm theo nhà sản xuất
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