ADM8611N263ACBZ-R7_技术文档

Ultralow Power Supervisory ICs with

Watchdog Timer and Manual Reset

Data Sheet

ADM8611/ADM8612/ADM8613/ADM8614/ADM8615

FEATURES

FUNCTIONAL BLOCK DIAGRAMS

VCC

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

ADM8612

RESET

VIN

MR

RESET

GENERATOR

V

TH

DEBOUNCE

(ADM8611/ADM8612/ADM8613/ADM8615)

200 ms (typical) reset timeout

GND

Figure 1. ADM8612 Functional Block Diagram

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

VCC

ADM8614

RESET

GENERATOR

V

TH

WATCHDOG

DETECTOR

Power supply glitch immunity

WDI

Available in a 1.46 mm × 0.96 mm WLCSP

Operational temperature range: −40°C to +85°C

GND

WD_DIS

WDT_SEL

APPLICATIONS

Figure 2. ADM8614 Functional Block Diagram

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.

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 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

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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ADM8611/ADM8612/ADM8613/ADM8614/ADM8615

TABLE OF CONTENTS

Data Sheet

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

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

5/2016—Rev. B to Rev. C

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

Changes to

Pull-Up Resistance Parameter, Table 1...............4

MR

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

12/2017—Rev. D to Rev. E

Changes to Ordering Guide .......................................................... 17

1/2015—Revision 0: Initial Version

2/2017—Rev. C to Rev. D

Changes to Ordering Guide .......................................................... 17

Rev. F | Page 2 of 17

Data Sheet

ADM8611/ADM8612/ADM8613/ADM8614/ADM8615

SPECIFICATIONS

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

Symbol

Min

Typ

Max

Unit

Test Conditions/Comments

OPERATING VOLTAGE RANGE

ADM8611, ADM8613, ADM8614

ADM8612, ADM8615

V_CC

0.9

2

5.5

V

Guarantees valid RESET output

Guarantees RESET output low

0.9

UNDERVOLTAGE LOCKOUT (ADM8612,

ADM8615)

Input Voltage Rising

Input Voltage Falling

Hysteresis

UVLO_RISE

UVLO_FALL1.6

UVLO_HYS

1.95

V

mV

90

92

INPUT CURRENT

VCC Quiescent Current

I_CC

190

110

nA

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

VIN Average Input Current

4

8.5

32

nA

V_IN= 2 V, V_CC= 5.5 V

V_IN= 2 V, V_CC= 2 V

RESET THRESHOLD VOLTAGE¹

ADM8611, ADM8613, ADM8614

ADM8612, ADM8615

V_TH

Input falling

V_TH− 1.3% V_TH

V_TH− 1.4% 1.1

V_TH+ 1.3%

V_TH+ 1.4%

V_TH+ 1.6%

V_TH+ 1.7%

V_TH+ 1.8%

V_TH+ 1.9%

V_TH+ 2.0%

V_TH+ 2.1%

V_TH+ 2.2%

V

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

V_TH− 1.6%

1

V_TH− 1.6% 0.95

V_TH− 1.7% 0.9

V_TH− 1.8% 0.85

V_TH− 1.8% 0.8

V_TH− 1.9% 0.75

V_TH− 1.9% 0.7

V_TH− 2.0% 0.65

V_TH− 2.1% 0.6

V_TH− 2.1% 0.55

V_TH− 2.2% 0.5

RESET THRESHOLD HYSTERESIS

ADM8611, ADM8613, ADM8614

ADM8612, ADM8615

V_HYST

0.9% × V_TH

10.3

V

mV

ms

V_TH> 1 V

V_TH≤ 1 V

RESET TIMEOUT PERIOD

t_RP

170

200

240

PROPAGATION DELAY

VCC to RESET

t_{PD_VCC}

t_{PD_VIN}

ADM8611, ADM8613, ADM8614

VIN to RESET

18

26

23

37

35

µs

V_CCfalling with V_TH× 10% overdrive

V_INfalling with V_TH× 10% overdrive

ADM8612, ADM8615

INPUT GLITCH REJECTION

VCC Glitch Rejection

ADM8611, ADM8613, ADM8614

VIN Glitch Rejection

13.5

t_{GR_VCC}

t_{GR_VIN}

13.5

23

21

32

27

µs

V_CCfalling, with V_TH× 10% overdrive

V_INfalling with V_TH× 10% overdrive

ADM8612, ADM8615

Rev. F | Page 3 of 17

ADM8611/ADM8612/ADM8613/ADM8614/ADM8615

Data Sheet

Parameter

Symbol

Min

Typ

Max

Unit

Test Conditions/Comments

WATCHDOG INPUT, WDI (ADM8613,

ADM8614, ADM8615)

Watchdog Timeout Period¹

ADM8613, ADM8615

ADM8614

t_WD

t_WD− 13% t_WD

t_WD+ 19%

5

sec

nA

Base period, WD_SEL low

Extended period, WD_SEL high

V_WDI= V_CC= 5.5 V

Leakage Current

Input Threshold

High

0.9

V

Low

0.4

V

WDI Pulse Width

t_WPR

t_WPF

85

300

ns

High pulse

Low pulse

WDI Glitch Rejection

RESET OUTPUT

60

Output Voltage Low

V_{RST_OL}

0.4

5

V

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

_CC> 0.9 V, I_SINK= 0.9 mA

Leakage Current

nA

V_RESET= V_CC= 5.5 V

MANUAL RESET INPUT, MR (ADM8611,

ADM8612, ADM8613, ADM8615)

V_IL

0.4

V

V_IH

0.9

1

V

MR Minimum Input Pulse Width

µs

kΩ

MR Glitch Rejection

MR To Reset Delay

MR Pull-Up Resistance

0.4

0.65

t_{D_MR}

300

600

900

WATCHDOG TIMEOUT DISABLE INPUT,

WD_DIS (ADM8613, ADM8614)

V_IL

V_IH

0.4

+5

V

nA

µs

0.9

−5

Leakage Current

Glitch Rejection

V_{WD_DIS}= 0 V to V_CC

0.1

WATCHDOG TIMEOUT SELECTION

INPUT, WDT_SEL (ADM8614)

V_IL

V_IH

0.4

+5

V

nA

0.9

−5

Leakage Current

V_{WDT_SEL}= 0 V to V_CC

¹Not all device options are available as standard models. See the Ordering Guide for details.

Rev. F | Page 4 of 17

Data Sheet

ADM8611/ADM8612/ADM8613/ADM8614/ADM8615

ABSOLUTE MAXIMUM RATINGS

THERMAL RESISTANCE

Table 2.

θ_JAis specified for a device soldered on an FR4 board with a

minimum footprint.

Parameter

Rating

VCC

WD_DIS

RESET

−0.3 V to +6 V

−0.3 V to V_CC+ 0.3 V

10 mA

Table 3.

Package Type

θ_JA

Unit

VIN

MR

6-Ball WLCSP

105.6

°C/W

WDI

WDT_SEL

Input/Output Current

Storage Temperature Range

Operating Temperature Range

ESD CAUTION

−40°C to +150°C

−40°C to +85°C

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

ADM8611/ADM8612/ADM8613/ADM8614/ADM8615

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS

Data Sheet

BALL A1

INDICATOR

1

2

VCC

GND

A

B

C

GND

DNC

MR

RESET

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

B1

B2

C1

C2

GND

DNC

GND

MR

Ground. Both GND pins on the ADM8611 must be grounded.

Do Not Connect. Do not connect to this pin.

Ground. Both GND pins on the ADM8611 must be grounded.

Manual Reset Input, Active Low.

RESET

Active Low, Open-Drain RESET Output.

BALL A1

INDICATOR

1

2

VCC

GND

A

B

C

GND

MR

VIN

RESET

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

B1

B2

C1

GND

MR

Ground. Both GND pins on the ADM8612 must be grounded.

Manual Reset Input, Active Low.

GND

VIN

Ground. Both GND pins on the ADM8612 must be grounded.

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. F | Page 6 of 17

Data Sheet

ADM8611/ADM8612/ADM8613/ADM8614/ADM8615

BALL A1

INDICATOR

1

2

VCC

GND

A

B

C

WD_DIS

RESET

WDI

MR

TOP VIEW

(BALL SIDE DOWN)

Not to Scale

Figure 5. ADM8613 Pin Configuration

Table 6. ADM8613 Pin Function Descriptions

Pin No.

Mnemonic Description

A1

VCC

Power Supply Input. The voltage on the VCC pin is monitored on the ADM8613. 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

B1

B2

GND

WDI

WD_DIS

Ground.

Watchdog Timer Input.

Watchdog Function Disable Input. Tie this pin high to disable the watchdog function of the device. Connect

this pin to ground if it is not used.

C1

C2

MR

Manual Reset Input, Active Low.

RESET

Active Low, Open-Drain RESET Output.

BALL A1

INDICATOR

1

2

VCC

GND

A

B

C

WD_DIS

RESET

WDI

WDT_SEL

TOP VIEW

(BALL SIDE DOWN)

Not to Scale

Figure 6. ADM8614 Pin Configuration

Table 7. ADM8614 Pin Function Descriptions

Pin No. Mnemonic Description

A1

VCC

Power Supply Input. The voltage on the VCC pin is monitored on the ADM8614. 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

B1

B2

GND

WDI

WD_DIS

Ground.

Watchdog Timer Input.

Watchdog Function Disable Input. Tie this pin high to disable the watchdog function of the device. Connect this

pin to ground if it is not used.

C1

C2

WDT_SEL

RESET

Watchdog Timeout Selection Input. Pull this pin high to extend the watchdog timeout period of the ADM8614 to

100 sec. Pull this pin low to return the watchdog timeout period to its base value. Toggling WDT_SEL resets the

watchdog timer.

Active Low, Open-Drain RESET Output.

Rev. F | Page 7 of 17

ADM8611/ADM8612/ADM8613/ADM8614/ADM8615

Data Sheet

BALL A1

INDICATOR

1

2

VCC

GND

A

B

C

MR

VIN

WDI

RESET

TOP VIEW

(BALL SIDE DOWN)

Not to Scale

Figure 7. ADM8615 Pin Configuration

Table 8. ADM8615 Pin Function Descriptions

Pin No. Mnemonic Description

A1

VCC

Power Supply Input. The voltage on the VCC pin is not monitored on the ADM8615. 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

B1

B2

C1

GND

MR

Ground.

Manual Reset Input, Active Low.

Watchdog Timer Input.

Low Voltage Monitoring Input. This separate supply input allows the ADM8615 to monitor low voltages on the VIN

pin to 0.5 V.

WDI

VIN

C2

RESET

Active Low, Open-Drain RESET Output.

Rev. F | Page 8 of 17

Data Sheet

ADM8611/ADM8612/ADM8613/ADM8614/ADM8615

TYPICAL PERFORMANCE CHARACTERISTICS

120

600

500

400

300

200

100

0

V

= 2V

CC

= 3.3V

= 5.5V

115

110

105

100

95

90

85

80

75

70

0

0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5

LOGIC INPUT PIN VOLTAGE (V)

–40 –30 –20 –10

0

10 20 30 40 50 60 70 80

TEMPERATURE ( °C)

Figure 11. Supply Current (I_CC) vs. Logic Input Pin Voltage, with the Exception

Figure 8. Supply Current (I_CC) vs. Temperature

MR

of the

3.0

2.5

2.0

1.5

1.0

0.5

0

200

180

160

140

120

100

80

V

FALLING

CC

V

RISING

CC

60

40

20

0

0.5

1.0

1.5

2.0

2.5

0

200

400

600

800

1000

SUPPLY VOLTAGE (V)

WDI TOGGLING FREQUENCY (Hz)

Figure 12. Average Supply Current (I_CC) vs. WDI Toggling Frequency, Using a

Square Pulse Signal with a Duty Cycle of 50%

Figure 9. Supply Current (I_CC) vs. Supply Voltage, V_CC< 2V

8

120

110

100

90

I

, V = 0V

VIN CC

, V = 2V

VIN CC

7

6

, V = 2V

CC CC

5

4

3

2

80

1

0

70

–1

–2

60

2.0

0

0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5

(V)

2.5

3.0

3.5

4.0

4.5

5.0

5.5

V

SUPPLY VOLTAGE (V)

IN

Figure 10. Supply Current (I_CC) vs. Supply Voltage

Figure 13. VIN Pin and VCC Pin Input Current vs. V_IN

Rev. F | Page 9 of 17

ADM8611/ADM8612/ADM8613/ADM8614/ADM8615

Data Sheet

8

7

6

5

4

3

2

1

0

1.5

1.4

1.3

1.2

1.1

1.0

0.9

0.8

0.7

0.6

0.5

V

= 5.5V

= 3.3V

= 2V

CC

–40 –30 –20 –10

0

10 20 30 40 50 60 70 80

TEMPERATURE (°C)

–40 –30 –20 –10

0

10 20 30 40 50 60 70 80 90

TEMPERATURE (°C)

Figure 17. Normalized Reset Timeout Period vs. Temperature

Figure 14. VIN Leakage Current vs. Temperature

1.5

1.020

1.015

1.010

1.005

1.000

0.995

0.990

0.985

0.980

V

= 0.6V

= 2.0V

= 3.3V

= 4.7V

TH

1.4

1.3

1.2

1.1

1.0

0.9

0.8

0.7

0.6

0.5

–40

–20

0

20

40

60

80

–40

–20

0

20

40

60

80

TEMPERATURE (°C)

Figure 18. Normalized Watchdog Timeout Period vs. Temperature

Figure 15. Normalized Falling Threshold vs. Temperature

0.30

0.25

0.20

0.15

0.10

0.05

0

350

300

250

200

150

100

50

–0.05

–0.10

–0.15

–0.20

0

0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5

RESET PIN VOLTAGE (V)

1

10

100

INPUT OVERDRIVE (mV)

Figure 16. Maximum Transient Duration vs. Input Overdrive,

_CCand V_INFalling

RESET

Pin Voltage

Figure 19.

Pin Leakage vs.

V

Rev. F | Page 10 of 17

Data Sheet

ADM8611/ADM8612/ADM8613/ADM8614/ADM8615

0.50

0.45

0.40

0.35

0.30

0.25

0.20

0.15

0.10

0.05

0

R

= 10kΩ

PULLUP

= 100kΩ

0

0.5

1.0

1.5

(V)

2.0

2.5

3.0

V

CC

RESET

Timeout Delay With V_CCand V_INRising

Figure 20.

Pin Voltage vs. Voltage on VCC

Figure 22.

RESET

(with the

Pin Pulled Up to the VCC Pin Through R_PULLUP

)

2.0

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0

V

= 0.9V

= 1.2V

= 2.5V

= 4.25V

CC

1

2

3

4

5

6

7

8

9

I

10 11 12 13 14 15 16 17 18 19 20

(mA)

SINK

RESET

Figure 21.

Output Low Voltage (V_{RST_OL}) vs. Sink Current (I_SINK)

Figure 23.

Timeout Delay With V_CCand V_INFalling

Rev. F | Page 11 of 17

ADM8611/ADM8612/ADM8613/ADM8614/ADM8615

THEORY OF OPERATION

Data Sheet

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.

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.

RESET

The

is below the reference threshold, keeping the processor in a reset

RESET

output asserts whenever the monitored voltage level

state. The

output deasserts if the monitored voltage rises

VIN AS AN ADJUSTABLE INPUT

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.

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.

The ultralow supply current makes the ADM8611/ADM8612/

ADM8613/ADM8614/ADM8615 devices particularly suitable

for use in low power, portable equipment.

VCC

3.3V

12V

V

IO

VCC

ADM8611

RESET

MICROPROCESSOR

OUTPUT

ADM8615

RESET

VIN

MR

WDI

GENERATOR

V

TH

GND

MR

DEBOUNCE

Figure 27. ADM8615 Typical Application Circuit

GND

TRANSIENT IMMUNITY

Figure 24. ADM8611 Functional Block Diagram

VCC

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.

ADM8613

RESET

GENERATOR

V

TH

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.

WATCHDOG

DETECTOR

MR

DEBOUNCE

RESET OUTPUT

GND

WDI

WD_DIS

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 V_CCis greater than 0.9 V. For

the ADM8612 and ADM8615, the output is guaranteed to be

held low from when V_CC= 0.9 V to when the device exits ULVO.

Figure 25. ADM8613 Functional Block Diagram

VCC

ADM8615

RESET

VIN

MR

RESET

GENERATOR

V

TH

When the monitored voltage falls below its associated

WATCHDOG

DETECTOR

DEBOUNCE

RESET

threshold,

Asserting

is asserted within 23 µs to 26 µs (typical).

RESET

this quickly ensures that the entire system can

GND

WDI

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.

Figure 26. ADM8615 Functional Block Diagram

Rev. F | Page 12 of 17

Data Sheet

ADM8611/ADM8612/ADM8613/ADM8614/ADM8615

MANUAL RESET INPUT

WATCHDOG TIMEOUT SELECT INPUT

The ADM8611, ADM8612, ADM8613, and ADM8615 feature a

MR MR

Pulling the watchdog timeout select input (WDT_SEL) on the

ADM8614 high allows the device to extend its watchdog timeout

period from 1.6 sec (typical) to 100 sec (typical). This function

allows processors to have a long initialization time during startup.

manual reset input ( ). Drive

low to assert the reset output.

transitions from low to high, the reset remains asserted

for the duration of the reset timeout period before deasserting.

MR

When

The

input has a 600 kΩ internal pull-up resistor so that the

MR

The long timeout period also enables the processor to stay in

low power mode for a long period and work only intermittently,

reducing overall system power consumption.

input is always high when unconnected. To drive the

input,

use an external signal or a push-button switch to ground; debounce

circuitry is integrated on-chip for this purpose. Noise immunity is

TYPICAL APPLICATION CIRCUITS

MR

provided on the

input, and fast, negative going transients of

3.3V

up to 0.4 µs (typical) are ignored. If required, a 0.1 μF capacitor

MR

between the

immunity.

pin and ground provides additional noise

V

CORE

VCC

MR

RESET

MICROPROCESSOR

ADM8611

V

VCC

TH

GND

t_RP

RESET

MR

Figure 30. ADM8611 Typical Application Circuit

0.8V

MR EXTERNALLY

DRIVEN LOW

3.3V

t_{D_MR}

V

CORE

IO

VCC

Figure 28. Manual Reset Timing

RESET

INPUT

MICROPROCESSOR

WATCHDOG TIMER

ADM8612

MR

VIN

The ADM8613/ADM8614/ADM8615 feature a watchdog timer

that monitors microprocessor activity. A timer circuit is cleared

with every low to high or high to low logic transition on the watch-

dog input pin (WDI), which detects pulses as short as 85 ns. If

the timer counts through the preset watchdog timeout period (t_WD),

GND

Figure 31. ADM8612 Typical Application Circuit

2.5V

RESET

a

output is asserted. The microprocessor must toggle the

WDI pin to avoid being reset. Failure of the microprocessor to

toggle the WDI pin within the timeout period indicates a code

execution error, and the reset pulse generated restarts the

microprocessor in a known state.

VCC

MR

V

IO

RESET

MICROPROCESSOR

OUTPUT

ADM8613

WDI

WD_DIS

In addition to logic transitions on WDI, the watchdog timer

is also cleared by a reset assertion caused by an undervoltage

GND

MR

condition on the VCC pin, WDT_SEL toggling, or

being

is asserted, the watchdog timer is

RESET

Figure 32. ADM8613 Typical Application Circuit

RESET

pulled low. When

cleared and does not begin counting again until the

2.5V

output is deasserted. The watchdog timer can be disabled by

driving the watchdog disable input (WD_DIS) high.

V

IO

RESET

VCC

RESET

MICROPROCESSOR

ADM8614

V

TH

V

CC

OUTPUT

WDI

WD_DIS

WDT_SEL

RESET

WDI

t_RP

t_WD

t_RP

GND

0V

Figure 33. ADM8614 Typical Application Circuit

Figure 29. Watchdog Timer Timing

Rev. F | Page 13 of 17

ADM8611/ADM8612/ADM8613/ADM8614/ADM8615

Data Sheet

If the watchdog input is driven by a push-pull output with a logic

high level near the minimum logic high specification of the digital

input, then a logic high input may cause CMOS shoot through

and increase the bias current (I_CC) of the ADM8613/ADM8614/

ADM8615. To minimize the power loss in this setup, use short

positive pulses to drive the WDI pin. The ideal pulse width is as

small as possible but greater than the required minimum pulse

width of the WDI input. One pulse within the watchdog timeout

period is sufficient to prevent the watchdog timer from generating

a reset output.

LOW POWER DESIGN TECHINQUES

With their ultralow power consumption level, the ADM8611/

ADM8612/ADM8613/ADM8614/ADM8615 are ideal for battery-

powered, low power applications where every bit of power matters.

In addition to using low power ICs, good circuit design practices

can help the user further reduce the overall system power loss.

Digital Inputs

The digital inputs of the ADM8611/ADM8612/ADM8613/

ADM8614/ADM8615 voltage supervisors are designed with

CMOS technology to minimize power consumption. The nature of

the CMOS structure leads to an increase of the device I_CC, while

the voltage level on the input approaches its undefined logic range,

as shown in Figure 11. To minimize this effect, follow these

recommendations:

HIGH

LOW

2.5V

VCC

1.5V

V

IO

WATCHDOG

OUTPUT

WDI

PUSH-PULL

OUTPUT

•

If the digital input does not need to be toggled in a particular

design, tie it directly to the VCC or GND pin of the device.

Push-pull outputs with logic high levels close to the V_CCof the

ADM8611/ADM8612/ADM8613/ADM8614/ADM8615 are

the ideal choice for driving the digital signal line.

Using push-pull outputs with a logic high level near the

minimum logic high specification of the digital input is

usually not recommended. One exception is if the input is

required to be driven high only infrequently for a relatively

short period.

MICROPROCESSOR

ADM8614

•

Figure 34. Using a Push-Pull Output with a Lower Logic High Level to VCC,

Driving the WDI Pin with Short Positive Pulse to Reduce I_CC

Similarly, if an open-drain input/output with a pull-up resistor

to VCC is used to drive WDI, a logic low input causes additional

current flowing through the pull-up resistor. A short negative

pulse technique can minimize the long-term current consumption.

2.5V

•

Open-drain outputs with a pull-up resistor to VCC can be

used to drive digital signal lines. Open-drain outputs are

best suited for driving lines that are required to be driven

low only infrequently for a relatively short period.

The leakage current on both the digital input and the open-

drain output determines the size of the pull-up resistor

needed and, in turn, decides the power loss through the

resistor while driving the input low.

VCC

OPEN-DRAIN

OUTPUT

WDI

WATCHDOG

OUTPUT

MICROPROCESSOR

ADM8614

HIGH

LOW

Figure 35. Short Negative Pulse on the WDI Pin to Reduce Leakage Current

Through the Pull-Up Resistor

MR

The

pin on the ADM8611, ADM8612, ADM8613, and

ADM8615 features an internal pull-up resistor. The infrequent

usage of this pin makes its power loss while driven to logic

low negligible.

WD_DIS Input

For the ADM8613 and ADM8614, the watchdog disable input

(WD_DIS) disables the watchdog function during system

prototyping or during power-up to allow extra time for

processor initialization.

WDI Input

When the watchdog input (WDI) is driven by a push-pull

input/output with a logic high level near the V_CClevel of the

ADM8613/ADM8614/ADM8615, neither a high nor a low input

logic causes the system to consume additional current. To reduce

the total current consumption, increase the speed of the input

transition to the number of transitions. One high to low or low

to high transition within the watchdog timeout period is sufficient

to prevent the watchdog timer from generating a reset output.

To disable the watchdog timer function during power-up after a

reset deassertion, the processor configures its input/output and

drives WD_DIS high within the watchdog timeout period. If

there is not enough time to configure the input/output or if an

open-drain input/output is used to drive WD_DIS, an external

pull-up resistor is required to keep the watchdog function disabled

during power-up. Extra current is consumed through the pull-up

resistor to enable the watchdog function. The leakage current

on both WD_DIS and the input/output that drives it determines

the size of the pull-up resistor needed and, in turn, determines

the power loss through the resistor while driving the input low.

Rev. F | Page 14 of 17

Data Sheet

ADM8611/ADM8612/ADM8613/ADM8614/ADM8615

DEVICE MODEL OPTIONS

The ADM8611/ADM8612/ADM8613/ADM8614/ADM8615 include many device options; however, not all options are released for sale.

Released options are called standard models and are listed in the Ordering Guide. For the most up to date list of standard models, refer to

the Analog Devices website at www.analog.com/supervisory. Contact an Analog Devices sales representative for information on nonstandard

models, and be aware that samples and production units have long lead times.

Table 9. Selection Table

Device

Number

Low Voltage

Monitoring

Manual

Reset

Watchdog

Timer

Watchdog Disable

Input

Watchdog Timeout

Selection Input

ADM8611

ADM8612

ADM8613

ADM8614

ADM8615

No

Yes

No

Yes

No

Yes

No

Yes

No

Yes

No

Yes

Table 10. ADM8611 V_CCReset Threshold Voltage (V_TH) Options (T_A= −40°C to +85°C)

Reset Threshold Number

Min

Typ

Max

Unit

200

220

232

263

280

293

300

308

440

463

1.974

2.171

2.290

2.596

2.764

2.892

2.961

3.040

4.343

4.570

2

2.2

2.026

2.229

2.350

2.664

2.836

2.968

3.039

3.120

4.457

4.690

V

2.32

2.63

2.8

2.93

3

3.08

4.4

4.63

Table 11. ADM8612 and ADM8615 V_INReset Threshold Voltage (V_TH) Options (T_A= −40°C to +85°C)

Reset Threshold Number

Min

Typ

0.5

0.55

0.6

0.65

0.7

0.75

0.8

0.85

0.9

0.95

1

1.1

1.2

1.3

1.4

1.5

1.6

1.7

1.8

1.9

Max

Unit

V

050

055

060

065

070

075

080

085

090

095

100

110

120

130

140

150

160

170

180

190

0.489

0.538

0.588

0.637

0.686

0.736

0.785

0.835

0.885

0.935

0.984

1.084

1.184

1.283

1.382

1.481

1.579

1.678

1.777

1.875

0.511

0.562

0.612

0.663

0.714

0.764

0.815

0.865

0.915

0.965

1.016

1.116

1.216

1.317

1.418

1.520

1.621

1.722

1.823

1.925

V

Rev. F | Page 15 of 17

ADM8611/ADM8612/ADM8613/ADM8614/ADM8615

Data Sheet

Table 12. ADM8613 and ADM8614 V_CCReset Threshold Voltage (V_TH) Options (T_A= −40°C to +85°C)

Reset Threshold Number

Min

Typ

2.32

2.63

2.93

3.08

4.63

Max

Unit

V

232

263

293

308

463

2.290

2.596

2.892

3.040

4.570

2.350

2.664

2.968

3.120

4.690

V

Table 13. ADM8613 and ADM8615 Watchdog Timeout Options (T_A= −40°C to +85°C)

Watchdog Timeout Period Code

Min

Typ

Max

Unit

Test Condition/Comments

WD_DIS low

Y

Z

1.4

22.3

1.6

25.6

1.9

30.5

sec

Table 14. ADM8614 Watchdog Timeout Options (T_A= −40°C to +85°C)

Watchdog Timeout Period Code

Min

1.4

87

Typ

Max

Unit

sec

Test Condition/Comments

WD_DIS low, WDT_SEL low

WD_DIS low, WDT_SEL high

Y

1.6

100

1.9

119

Table 15. Standard Models

Model

Reset Threshold (V)

Watchdog Timeout (sec)

ADM8611N263ACBZ-R7

ADM8611N293ACBZ-R7

ADM8612N110ACBZ-R7

ADM8613Y232ACBZ-R7

ADM8613Z232ACBZ-R7

ADM8614Y263ACBZ-R7

ADM8615Y100ACBZ-R7

ADM8615Z050ACBZ-R7

2.63

2.93

1.1

2.32

2.63

1

N/A

1.6

25.6

1.6

25.6

0.5

ADM861_ _ _ _ _A_ _Z-R7

GENERIC NUMBER

(1 TO 5)

PACKING MATERIAL

R7 = 7" TAPE AND REEL

(3000 PIECE QUANTITY)

WATCHD

OG TIME

OUT PE

RIOD COD

E

Z = LEAD-FREE

Y:1.6s (T

YP)

Z: 25.6s (

TYP)

PACKAGE DESIGNATON

CB: WLCSP

N: NO W

ATCH DO

G FUNCT

ION

RESET T

HRESHO

LD NUM

BER

TEMPERAT

URE RANG

E

(050 TO 463)

A: –40°C T

O +85°C

Figure 36. Ordering Code Structure

Rev. F | Page 16 of 17

Data Sheet

ADM8611/ADM8612/ADM8613/ADM8614/ADM8615

OUTLINE DIMENSIONS

1.000

0.960

0.920

BOTTOM VIEW

(BALL SIDE UP)

2

1

A

B

BALL A1

IDENTIFIER

1.500

1.460

1.420

1.00

REF

C

0.50

BSC

TOP VIEW

(BALL SIDE DOWN)

0.50 BSC

0.390

0.360

0.330

0.660

0.600

0.540

SIDE VIEW

COPLANARITY

0.04

0.360

0.320

0.280

0.270

0.240

0.210

SEATING

PLANE

Figure 37. 6-Ball Wafer Level Chip Scale Package [WLCSP]

(CB-6-17)

Dimensions shown in millimeters

ORDERING GUIDE

Model^{1, 2, 3}

Temperature Range Package Description

Package Option Marking Code

ADM8611N263ACBZ-R7 −40°C to +85°C

ADM8611N293ACBZ-R7 −40°C to +85°C

ADM8612N110ACBZ-R7 −40°C to +85°C

ADM8613Y232ACBZ-R7 −40°C to +85°C

ADM8613Z232ACBZ-R7 −40°C to +85°C

ADM8614Y263ACBZ-R7 −40°C to +85°C

ADM8615Y100ACBZ-R7 −40°C to +85°C

ADM8615Z050ACBZ-R7 −40°C to +85°C

ADM8611-EVALZ

6-Ball Ball Wafer Level Chip Scale Package [WLCSP] CB-6-17

Evaluation Board

DJ

ES

DV

DQ

ED

DR

DS

EG

ADM8612-EVALZ

Evaluation Board

ADM8613-EVALZ

Evaluation Board

ADM8614-EVALZ

Evaluation Board

ADM8615-EVALZ

Evaluation Board

¹Z = RoHS Compliant Part.

²The ADM8611/ADM8612/ADM8613/ADM8614/ADM8615 include many device options; however, not all options are released for sale. Released options are called

standard models and are listed in the Ordering Guide. For the most up to date list of standard models, refer to the Analog Devices website at www.analog.com/supervisory.

Contact an Analog Devices sales representative for information on nonstandard models, and be aware that samples and production units have long lead times.

³If ordering nonstandard models, complete the ordering code shown in Figure 36 by inserting the model number, reset threshold, and watchdog timeout.

registered trademarks are the property of their respective owners.

D12782-0-2/18(F)

Rev. F | Page 17 of 17


型号：	ADM8611N263ACBZ-R7
厂家：	ADI
描述：	Ultralow Power Voltage Supervisor with Manual Reset
文件：	总17页 (文件大小：491K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

ADM8611N263ACBZ-R7 [ADI]

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