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ADM691AARN 参数 Datasheet PDF下载

ADM691AARN图片预览
型号: ADM691AARN
PDF下载: 下载PDF文件 查看货源
内容描述: 微处理器监控电路 [Microprocessor Supervisory Circuits]
分类和应用: 电源电路电源管理电路微处理器光电二极管监控
文件页数/大小: 12 页 / 339 K
品牌: AD [ ANALOG DEVICES ]
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a
FEATURES
Low Power Consumption:
Precision Voltage Monitor
2% Tolerance on ADM800L/M
Reset Time Delay—200 ms, or Adjustable
1 A Standby Current
Automatic Battery Backup Power Switching
Fast Onboard Gating of Chip Enable Signals
Also Available in TSSOP Package (ADM691A)
APPLICATIONS
Microprocessor Systems
Computers
Controllers
Intelligent Instruments
Automotive Systems
Critical P Power Monitoring
Microprocessor
Supervisory Circuits
ADM691A/ADM693A/ADM800L/M
FUNCTIONAL BLOCK DIAGRAM
BATT ON
4.65V
1
V
CC
V
OUT
V
BATT
CHIP ENABLE
OUTPUT
CONTROL
CE
IN
CE
OUT
LOW LINE
OSC IN
OSC SEL
RESET &
WATCHDOG
TIMEBASE
RESET &
GENERATOR
RESET
RESET
WATCHDOG
INPUT (WDI)
WATCHDOG
TRANSITION DETECTOR
WATCHDOG
TIMER
WATCHDOG
OUTPUT (WDO)
POWER FAIL
OUTPUT (PFO)
GENERAL DESCRIPTION
POWER FAIL
INPUT (PFI)
1.25V
The ADM691A/ADM693A/ADM800L/ADM800M family of
supervisory circuits offers complete single chip solutions for
power supply monitoring and battery control functions in
microprocessor systems. These functions include
µP
reset,
backup-battery switchover, watchdog timer, CMOS RAM write
protection, and power-failure warning. The family of products
provides an upgrade for the MAX691A/93A/800M family of
products.
All parts are available in 16-pin DIP and SO packages. The
ADM691A is also available in a space-saving TSSOP package.
The following functionality is provided:
1. Power-on reset output during power-up, power-down and
brownout conditions. The circuitry remains operational with
V
CC
as low as 1 V.
2. Battery backup switching for CMOS RAM, CMOS micro-
processor or other low power logic.
3. A reset pulse if the optional watchdog timer has not been
toggled within a specified time.
4. A 1.25 V threshold detector for power fail warning, low bat-
tery detection, or to monitor a power supply other than +5 V.
ADM691A/ADM693A
ADM800L/ADM800M
1
VOLTAGE
DETECTOR = 4.4V (ADM693A/ADM800M)
INPUT
POWER
7805
+5V
0.1µF
V
CC
CMOS
RAM
R1
BATTERY
V
CC
V
BATT
BAT
ON
V
OUT
CE
OUT
ADDRESS
DECODE
A0–A15 µP
POWER
I/O LINE
NMI
µP
RESET
PFI
GND
R2
NC
ADM691A
CE
IN
ADM693A
ADM800L
ADM800M
WDI
PFO
RESET
WDO
OSC IN
OSC SEL
LOW LINE
SYSTEM
STATUS
INDICATORS
Figure 1. Typical Application
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
World Wide Web Site: http://www.analog.com
Fax: 617/326-8703
© Analog Devices, Inc., 1996