Low Power, Adjustable UV and OV Monitor

with 400 mV, ±0.275% Reference

Data Sheet

ADCMP671

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other

rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.

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

©2011 Analog Devices, Inc. All rights reserved.

FEATURES

Window monitoring with minimum processor I/O

Individually monitoring N rails with only N + 1 processor I/O

400 mV

Supply range: 1.7 V to 5.5 V

Low quiescent current: 17 μA maximum at 125°C

Input range includes ground

Internal hysteresis: 9.2 mV typical

Low input bias current: 2.5 nA maximum

Open-drain outputs

Power good indication output

Designated over voltage indication output

Low profile (1 mm), 6-lead TSOT package

APPLICATIONS

Supply voltage monitoring

Li-Ion monitoring

Portable applications

Handheld instruments

FUNCTIONAL BLOCK DIAGRAM

INH

UV

OV

INL

GND

400mV

ADCMP671

PWRGD

OV

Figure 1.

GENERAL DESCRIPTION

The ADCMP671 voltage monitor consists of two low power, high

accuracy comparators and reference circuits. It operates on a

supply voltage from 1.7 V to 5.5 V and draws 17 μA maximum,

making it suitable for low power system monitoring and portable

applications. The part is designed to monitor and report supply

undervoltage and overvoltage fault. The low input bias current

and voltage reference allows resistor adjustable UV and OV

threshold down to 400 mV. The ADCMP671 has two open-

drain outputs: the PWRGD output indicates that the supply is

within the UV and OV window, and the OV output indicates

that the supply is overvoltage. This output combination allows

users to window monitor N supplies with an N + 1 processor

input/output (I/O). Each output is guaranteed to sink greater

than 5 mA over temperature.

The ADCMP671 is available in 6-lead TSOT package. The

device operates over the −40°C to +125°C temperature range.

386

TEMPERATURE (°C)

–40

–20

0

20

40

60

80

100

120

404

402

400

398

396

394

392

390

388

RISING INPUT

FALLING INPUT

INL2

INH2

INL1

INH1

TWO TYPICAL PARTS

COMPARATOR A AND COMPARATOR B

Figure 2. Comparator Thresholds vs. Temperature