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ADM8613 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADM8613
Beschreibung Ultralow Power Supervisory IC
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 17 Seiten
ADM8613 Datasheet, Funktion
Data Sheet
Ultralow Power Supervisory ICs with
Watchdog Timer and Manual Reset
ADM8611/ADM8612/ADM8613/ADM8614/ADM8615
FEATURES
Ultralow power consumption with ICC = 92 nA (typical)
Continuous monitoring with no blank time
Pretrimmed voltage monitoring threshold options
10 options from 2 V to 4.63 V for the ADM8611
20 options from 0.5 V to 1.9 V for the ADM8612/ADM8615
5 options from 2.32 V to 4.63 V for the ADM8613/ADM8614
±1.3% threshold accuracy over full temperature range
Manual reset input
(ADM8611/ADM8612/ADM8613/ADM8615)
200 ms (typical) reset timeout
Low voltage input monitoring down to 0.5 V (ADM8612/
ADM8615)
Watchdog timer (ADM8613/ADM8614/ADM8615)
Watchdog function disable input (ADM8613/ADM8614 only)
Watchdog timeout extension input (ADM8614 only)
Active low, open-drain RESET output
Power supply glitch immunity
Available in a 1.46 mm × 0.96 mm WLCSP
Operational temperature range: −40°C to +85°C
APPLICATIONS
Portable/battery-operated equipment
Microprocessor systems
Energy metering
Energy harvesting
GENERAL DESCRIPTION
The ADM8611/ADM8612/ADM8613/ADM8614/ADM8615
are voltage supervisory circuits that monitor power supply voltage
levels and code execution integrity in microprocessor-based
systems. Apart from providing power-on reset signals, an on-
chip watchdog timer can reset the microprocessor if it fails to
strobe within a preset timeout period. A reset signal can also be
asserted by an external push-button through a manual reset input.
The ultralow power consumption of these devices makes them
suitable for power efficiency sensitive systems, such as battery-
powered portable devices and energy meters.
The features of each member of the device family are shown in
Table 9. Each device subdivides into submodels with differences
in factory preset voltage monitoring threshold options. In the
range of 2 V to 4.63 V, 10 options are available for the ADM8611.
In the range of 2.32 V to 4.63 V, five options are available for
FUNCTIONAL BLOCK DIAGRAMS
VCC
VIN
VTH
ADM8612
RESET
GENERATOR
RESET
MR DEBOUNCE
GND
Figure 1. ADM8612 Functional Block Diagram
VCC
ADM8614
RESET
RESET
VTH GENERATOR
WDI
WATCHDOG
DETECTOR
GND
WD_DIS WDT_SEL
Figure 2. ADM8614 Functional Block Diagram
both the ADM8613 and ADM8614. A separate supply input
allows the ADM8612 and ADM8615 to monitor 20 different
low voltage levels from 0.5 V to 1.9 V.
The ADM8611, ADM8612, ADM8613, and ADM8615 can
reset on demand through the manual reset input. The watchdog
function on the ADM8613, ADM8614, and ADM8615 monitors
the heartbeat of the microprocessor through the WDI pin. The
ADM8613 and ADM8614 have a watchdog disable input, which
allows the user to disable the watchdog function, if required. The
ADM8614 also has a watchdog timeout extension input, allowing
the watchdog timeout to be extended from 1.6 sec to 100 sec.
The ADM8611/ADM8612/ADM8613/ADM8614/ADM8615
are available in a 6-ball, 1.46 mm × 0.96 mm WLCSP. These
devices are specified over the temperature range of −40°C to +85°C.
Rev. D
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Tel: 781.329.4700 ©2015–2017 Analog Devices, Inc. All rights reserved.
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ADM8613 Datasheet, Funktion
ADM8611/ADM8612/ADM8613/ADM8614/ADM8615
Data Sheet
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
BALL A1
INDICATOR
12
VCC
A
DNC
B
GND
GND
MR RESET
C
TOP VIEW
(BALL SIDE DOWN)
Not to Scale
DNC = DO NOT CONNECT.
DO NOT CONNECT TO THIS PIN.
Figure 3. ADM8611 Pin Configuration
Table 4. ADM8611 Pin Function Descriptions
Pin No. Mnemonic Description
A1 VCC
Power Supply Input. The voltage on the VCC pin is monitored on the ADM8611. It is recommended to place a
0.1 μF decoupling capacitor as close as possible to the device between the VCC pin and the GND pin.
A2 GND
Ground. Both GND pins on the ADM8611 must be grounded.
B1 DNC
Do Not Connect. Do not connect to this pin.
B2 GND Ground. Both GND pins on the ADM8611 must be grounded.
C1 MR
Manual Reset Input, Active Low.
C2
RESET
Active Low, Open-Drain RESET Output.
BALL A1
INDICATOR
12
VCC
A
GND
MR
B
GND
VIN RESET
C
TOP VIEW
(BALL SIDE DOWN)
Not to Scale
Figure 4. ADM8612 Pin Configuration
Table 5. ADM8612 Pin Function Descriptions
Pin No. Mnemonic Description
A1 VCC
Power Supply Input. The voltage on the VCC pin is not monitored on the ADM8612. It is recommended to place a
0.1 μF decoupling capacitor as close as possible to the device between the VCC pin and the GND pin.
A2 GND Ground. Both GND pins on the ADM8612 must be grounded.
B1 MR
Manual Reset Input, Active Low.
B2 GND Ground. Both GND pins on the ADM8612 must be grounded.
C1 VIN
Low Voltage Monitoring Input. This separate supply input allows the ADM8612 to monitor low voltages on the
VIN pin to 0.5 V.
C2
RESET
Active Low, Open-Drain RESET Output.
Rev. D | Page 6 of 17

6 Page









ADM8613 pdf, datenblatt
ADM8611/ADM8612/ADM8613/ADM8614/ADM8615
Data Sheet
THEORY OF OPERATION
The ADM8611/ADM8612/ADM8613/ADM8614/ADM8615
low power voltage supervisors protect the integrity of system
operation by ensuring the proper operation during power-up,
power-down, and brownout conditions. These devices monitor
the input voltage level and compare it against an internal reference.
The RESET output asserts whenever the monitored voltage level
is below the reference threshold, keeping the processor in a reset
state. The RESET output deasserts if the monitored voltage rises
above the threshold reference for a minimum period, the active
reset timeout period. This ensures that the supply voltage for
the processor is raised to an adequate level and stable before
exiting reset.
The ultralow supply current makes the ADM8611/ADM8612/
ADM8613/ADM8614/ADM8615 devices particularly suitable
for use in low power, portable equipment.
VCC
ADM8611
RESET
RESET
VTH GENERATOR
MR DEBOUNCE
GND
Figure 24. ADM8611 Functional Block Diagram
VCC
ADM8613
RESET
RESET
VTH GENERATOR
MR DEBOUNCE
WATCHDOG
DETECTOR
GND
WDI WD_DIS
Figure 25. ADM8613 Functional Block Diagram
VCC
VIN
VTH
ADM8615
RESET
GENERATOR
RESET
MR DEBOUNCE
WATCHDOG
DETECTOR
GND
WDI
Figure 26. ADM8615 Functional Block Diagram
VOLTAGE MONITORING INPUT
The VCC pin of the ADM8611/ADM8613/ADM8614 acts as
both a device power input node and a voltage monitoring input
node. The ADM8612 uses separate pins for supply and voltage
monitoring to achieve a low voltage monitoring threshold to 0.5 V.
It is recommended to place a 0.1 μF decoupling capacitor as close
as possible to the device between the VCC pin and the GND pin.
VIN AS AN ADJUSTABLE INPUT
Due to the low leakage nature of the VIN pin, the ADM8612 or
ADM8615 can be used as devices with an adjustable threshold. Use
an external resistor divider circuit to program the desired voltage
monitoring threshold based on the VIN threshold, as shown in
Figure 27.
3.3V
12V
VCC
RESET
ADM8615
VIN WDI
MR GND
VIO
RESET
MICROPROCESSOR
OUTPUT
Figure 27. ADM8615 Typical Application Circuit
TRANSIENT IMMUNITY
To avoid unnecessary resets caused by fast power supply transients,
an input glitch filter is added to the VCC pin of the ADM8611/
ADM8613/ADM8614 and the VIN pin of the ADM8612 and
ADM8615 to filter out the transient glitches on these pins.
Figure 16 shows the comparator overdrive (that is, the maximum
magnitude of negative going pulses with respect to the typical
threshold) vs. the pulse duration without a reset.
RESET OUTPUT
The ADM8611/ADM8612/ADM8613/ADM8614/ADM8615
devices all have an active low, open-drain reset output. For the
ADM8611/ADM8613/ADM8614, the state of the output is
guaranteed to be valid as soon as VCC is greater than 0.9 V. For
the ADM8612 and ADM8615, the output is guaranteed to be
held low from when VCC = 0.9 V to when the device exits ULVO.
When the monitored voltage falls below its associated threshold,
RESET is asserted within 23 μs to 26 μs (typical). Asserting RESET
this quickly ensures that the entire system can be reset at once
before any part of the system voltage falls below its recommended
operating voltage. This system reset can avoid dangerous and/or
erroneous operation of a microprocessor-based system.
Rev. D | Page 12 of 17

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