ANALOG DEVICES ADM8693 Service Manual
Microprocessor
ADM8690/ADM8691/ADM8692/ADM8693/ADM8695
RESET
1.3V
RESET
GENERATOR
2
WATCHDOG
TRANSITION DETECTOR
(1.6s)
4.65V
1
ADM8690/
ADM8692
WATCHDOG
INPUT (WDI)
POWER FAIL
INPUT (PFI)
V
CC
V
BATT
V
OUT
POWER FAIL
OUTPUT (PFO)
1
VOLTAG E DE TECTOR = 4. 65V ( ADM 8690)
4.40V (ADM8692)
2
RESET PULS E WIDTH = 50ms (AD8690, ADM 8692)
00093-001
1.3V
LOW LINE
RESET
RESET
OSC IN
OSC SEL
BATT ON
ADM8691/
ADM8693/
ADM8695
4.65V
1
RESET AND
WATCHDOG
TIME BASE
RESET
GENERATOR
WATCHDOG
TRANSITION DETECTOR
WATCHDOG
TIMER
POWER FAIL
INPUT (PFI)
WATCHDOG
INPUT (WDI)
CE
IN
V
CC
V
BATT
V
OUT
POWER FAIL
OUTPUT (PFO)
WATCHDOG
OUTPUT (WDO)
CE
OUT
1
VOLTAG E DE TECTOR = 4. 65V ( ADM 8691, ADM8695)
00093-002
4.40V (ADM8693)
FEATURES
Upgrade for ADM690 to ADM695, MAX690 to MAX695
Specified over temperature
Low power consumption (0.7 mW)
Precision voltage monitor
Reset assertion down to 1 V V
Low switch on resistance 0.7 Ω normal, 7 Ω in backup
High current drive (100 mA)
Watchdog timer: 100 ms, 1.6 s, or adjustable
400 nA standby current
Automatic battery backup power switching
Extremely fast gating of chip enable signals (3 ns)
Voltage monitor for power fail
Available in TSSOP package
APPLICATIONS
Microprocessor systems
Computers
Controllers
Intelligent instruments
Automotive systems
CC
Supervisory Circuits
FUNCTIONAL BLOCK DIAGRAMS
Figure 1. ADM8690/ADM8692
PRODUCT HIGHLIGHTS
The ADM8690 and ADM8692 are available in 8-lead, PDIP
packages and provide:
1. Power-on reset output during power-up, power-down, and
RESET
brownout conditions. The
operational with V
as low as 1 V.
CC
2. Battery backup switching for CMOS RAM, CMOS
microprocessor, or other low power logic.
3. A reset pulse if the optional watchdog timer has not been
toggled within a specified time.
4. A 1.3 V threshold detector for power-fail warning, low battery
detection, or to monitor a power supply other than 5 V.
The ADM8691, ADM8693, and ADM8695 are available in 16-lead
PDIP and small outline packages (including TSSOP) and
provide three additional functions:
1. Write protection of CMOS RAM or EEPROM.
2. Adjustable reset and watchdog timeout periods.
3. Separate watchdog timeout, backup battery switchover, and
low V
status outputs.
Rev. B
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responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
CC
output remains
Figure 2. ADM8691/ADM8693/ADM8695
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2006-2011 Analog Devices, Inc. All rights reserved.
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