Data Sheet
FEATURES
Ultralow Power Supervisory ICs with
Watchdog Timer and Manual Reset
ADM8611/ADM8612/ADM8613/ADM8614/ADM8615
FUNCTIONAL BLOCK DIAGRAMS
VCC
GND
WD_DIS
WDT_SEL
APPLICATIONS
Portable/battery-operated equipment
Microprocessor systems
Energy metering
Energy harvesting
Figure 2.
ADM8614
Functional Block Diagram
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
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. Not all device options are
available as standard models. See the Ordering Guide for details.
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. F
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12782-002
Ultralow power consumption with I
CC
= 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
ADM8612
VIN
V
TH
RESET
RESET
GENERATOR
MR
DEBOUNCE
12782-001
GND
Figure 1.
ADM8612
Functional Block Diagram
VCC
ADM8614
RESET
V
TH
RESET
GENERATOR
WDI
WATCHDOG
DETECTOR
ADM8611/ADM8612/ADM8613/ADM8614/ADM8615
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Functional Block Diagrams ............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings ............................................................ 5
Thermal Resistance ...................................................................... 5
ESD Caution .................................................................................. 5
Pin Configurations and Function Descriptions ........................... 6
Typical Performance Characteristics ............................................. 9
Theory of Operation ...................................................................... 12
Data Sheet
Voltage Monitoring Input.......................................................... 12
VIN as an Adjustable Input....................................................... 12
Transient Immunity ................................................................... 12
Reset Output ............................................................................... 12
Manual Reset Input .................................................................... 13
Watchdog Timer ......................................................................... 13
Watchdog Timeout Select Input ............................................... 13
Typical Application Circuits ..................................................... 13
Low Power Design Techinques ................................................. 14
Device Options ............................................................................... 15
Outline Dimensions ....................................................................... 17
Ordering Guide .......................................................................... 17
REVISION HISTORY
2/2018—Rev. E to Rev. F
Changes to General Description Section ...................................... 1
Added Note 1, Table 1 ...................................................................... 4
Changed Device Options Section to Model Options Section ...... 15
Changes to Model Options Section.............................................. 15
Added Table 15; Renumbered Sequentially ................................ 16
Changes to Ordering Guide .......................................................... 17
12/2017—Rev. D to Rev. E
Changes to Ordering Guide .......................................................... 17
2/2017—Rev. C to Rev. D
Changes to Ordering Guide .......................................................... 17
5/2016—Rev. B to Rev. C
Changes to MR Pull-Up Resistance Parameter, Table 1 ...............4
12/2015—Rev. A to Rev. B
Changes to Watchdog Timeout Period Parameter, Table 1 .........4
Changes to Ordering Guide .......................................................... 17
4/2015—Rev. 0 to Rev. A
Changes to Reset Threshold Hysteresis Parameter, Table 1 ........3
1/2015—Revision 0: Initial Version
Rev. F | Page 2 of 17
Data Sheet
SPECIFICATIONS
ADM8611/ADM8612/ADM8613/ADM8614/ADM8615
V
CC
= 2 V to 5.5 V, V
IN
< V
CC
+ 0.3 V, T
A
= −40°C to +85°C, unless otherwise noted. Typical values are at T
A
= 25°C.
Table 1.
Parameter
OPERATING VOLTAGE RANGE
ADM8611, ADM8613, ADM8614
ADM8612, ADM8615
UNDERVOLTAGE LOCKOUT (ADM8612,
ADM8615)
Input Voltage Rising
Input Voltage Falling
Hysteresis
INPUT CURRENT
VCC Quiescent Current
Symbol
V
CC
Min
0.9
2
0.9
Typ
Max
5.5
5.5
Unit
V
V
V
Test Conditions/Comments
Guarantees valid RESET output
Guarantees valid RESET output
Guarantees RESET output low
UVLO
RISE
UVLO
FALL
UVLO
HYS
I
CC
1.95
1.6
90
92
190
110
V
V
mV
nA
nA
nA
nA
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
mV
ms
V
CC
= 2 V to 5.5 V, RESET deasserts,
V
WDI
= V
CC
V
CC
= 2 V to 5.5 V, RESET deasserts,
V
WDI
= V
CC
, T
A
= 25°C
V
IN
= 2 V, V
CC
= 5.5 V
V
IN
= 2 V, V
CC
= 2 V
Input falling
See Table 10 and Table 12
V
TH
≥ 1.2 V, see Table 11
1.1 V threshold option
1 V threshold option
0.95 V threshold option
0.9 V threshold option
0.85 V threshold option
0.8 V threshold option
0.75 V threshold option
0.7 V threshold option
0.65 V threshold option
0.6 V threshold option
0.55 V threshold option
0.5 V threshold option
VIN Average Input Current
RESET THRESHOLD VOLTAGE
1
ADM8611, ADM8613, ADM8614
ADM8612, ADM8615
V
TH
V
TH
− 1.3%
V
TH
− 1.3%
V
TH
− 1.4%
V
TH
− 1.6%
V
TH
− 1.6%
V
TH
− 1.7%
V
TH
− 1.8%
V
TH
− 1.8%
V
TH
− 1.9%
V
TH
− 1.9%
V
TH
− 2.0%
V
TH
− 2.1%
V
TH
− 2.1%
V
TH
− 2.2%
V
HYST
4
4
V
TH
V
TH
1.1
1
0.95
0.9
0.85
0.8
0.75
0.7
0.65
0.6
0.55
0.5
0.9% × V
TH
0.9% × V
TH
10.3
200
8.5
32
V
TH
+ 1.3%
V
TH
+ 1.3%
V
TH
+ 1.4%
V
TH
+ 1.6%
V
TH
+ 1.6%
V
TH
+ 1.7%
V
TH
+ 1.8%
V
TH
+ 1.8%
V
TH
+ 1.9%
V
TH
+ 1.9%
V
TH
+ 2.0%
V
TH
+ 2.1%
V
TH
+ 2.1%
V
TH
+ 2.2%
RESET THRESHOLD HYSTERESIS
ADM8611, ADM8613, ADM8614
ADM8612, ADM8615
RESET TIMEOUT PERIOD
PROPAGATION DELAY
VCC to RESET
ADM8611, ADM8613, ADM8614
VIN to RESET
ADM8612, ADM8615
INPUT GLITCH REJECTION
VCC Glitch Rejection
ADM8611, ADM8613, ADM8614
VIN Glitch Rejection
ADM8612, ADM8615
V
TH
> 1 V
V
TH
≤ 1 V
t
RP
t
PD_VCC
170
240
18
t
PD_VIN
13.5
t
GR_VCC
13.5
t
GR_VIN
13.5
26
23
37
35
µs
µs
V
CC
falling with V
TH
× 10% overdrive
V
IN
falling with V
TH
× 10% overdrive
23
21
32
27
µs
µs
V
CC
falling, with V
TH
× 10% overdrive
V
IN
falling with V
TH
× 10% overdrive
Rev. F | Page 3 of 17
ADM8611/ADM8612/ADM8613/ADM8614/ADM8615
Parameter
WATCHDOG INPUT, WDI (ADM8613,
ADM8614, ADM8615)
Watchdog Timeout Period
1
ADM8613, ADM8615
ADM8614
Leakage Current
Input Threshold
High
Low
WDI Pulse Width
WDI Glitch Rejection
RESET OUTPUT
Output Voltage Low
Symbol
Min
Typ
Max
Unit
Data Sheet
Test Conditions/Comments
t
WD
t
WD
− 13%
t
WD
− 13%
t
WD
− 13%
t
WD
t
WD
t
WD
t
WD
+ 19%
t
WD
+ 19%
t
WD
+ 19%
5
sec
sec
sec
nA
V
V
ns
ns
ns
V
V
V
V
nA
Base period, WD_SEL low
Extended period, WD_SEL high
V
WDI
= V
CC
= 5.5 V
0.9
0.4
t
WPR
t
WPF
85
300
60
V
RST_OL
0.4
0.4
0.4
0.4
5
High pulse
Low pulse
Leakage Current
MANUAL RESET INPUT, MR (ADM8611,
ADM8612, ADM8613, ADM8615)
V
IL
V
IH
MR Minimum Input Pulse Width
MR Glitch Rejection
MR To Reset Delay
MR Pull-Up Resistance
WATCHDOG TIMEOUT DISABLE INPUT,
WD_DIS (ADM8613,
ADM8614)
V
IL
V
IH
Leakage Current
Glitch Rejection
WATCHDOG TIMEOUT SELECTION
INPUT, WDT_SEL (ADM8614)
V
IL
V
IH
Leakage Current
1
V
CC
> 4.25 V, I
SINK
= 6.5 mA
V
CC
> 2.5 V, I
SINK
= 6 mA
V
CC
> 1.2 V, I
SINK
= 4.6 mA
V
CC
> 0.9 V, I
SINK
= 0.9 mA
V
RESET
= V
CC
= 5.5 V
0.4
0.9
1
t
D_MR
300
0.4
0.65
600
900
V
V
µs
µs
µs
kΩ
0.4
0.9
−5
0.1
+5
V
V
nA
µs
V
WD_DIS
= 0 V to V
CC
0.4
0.9
−5
+5
V
V
nA
V
WDT_SEL
= 0 V to V
CC
Not all device options are available as standard models. See the Ordering Guide for details.
Rev. F | Page 4 of 17
Data Sheet
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
VCC
WD_DIS
RESET
VIN
MR
WDI
WDT_SEL
Input/Output Current
Storage Temperature Range
Operating Temperature Range
ADM8611/ADM8612/ADM8613/ADM8614/ADM8615
THERMAL RESISTANCE
Rating
−0.3 V to +6 V
−0.3 V to +6 V
−0.3 V to +6 V
−0.3 V to +6 V
−0.3 V to V
CC
+ 0.3 V
−0.3 V to V
CC
+ 0.3 V
−0.3 V to V
CC
+ 0.3 V
10 mA
−40°C to +150°C
−40°C to +85°C
θ
JA
is specified for a device soldered on an FR4 board with a
minimum footprint.
Table 3.
Package Type
6-Ball WLCSP
θ
JA
105.6
Unit
°C/W
ESD CAUTION
Stresses at or above those listed under Absolute Maximum
Ratings may cause permanent damage to the product. This is a
stress rating only; functional operation of the product at these
or any other conditions above those indicated in the operational
section of this specification is not implied. Operation beyond
the maximum operating conditions for extended periods may
affect product reliability.
Rev. F | Page 5 of 17
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