ADCMP671 Datasheet, PDF (1/16 Pages) Analog Devices – Low Power, Adjustable UV and OV Monitor

Data Sheet
Low Power, Adjustable UV and OV Monitor
with 400 mV, ±0.275% Reference
ADCMP671
FEATURES
Window monitoring with minimum processor I/O
Individually monitoring N rails with only N + 1 processor I/O
400 mV, ± 0.275% threshold at VDD = 3.3 V, 25°C
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
FUNCTIONAL BLOCK DIAGRAM
V_DD
INH
UV
ADCMP671
PWRGD
400mV
OV
OV
INL
GND
Figure 1.
APPLICATIONS
Supply voltage monitoring
Li-Ion monitoring
Portable applications
Handheld instruments
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.
404
INH1
402
INL1
INH2
INL2
400
398
RISING INPUT
396
394
392
FALLING INPUT
390
388
TWO TYPICAL PARTS
COMPARATOR A AND COMPARATOR B
V_DD = 5V
386
–40 –20 0
20 40 60 80
TEMPERATURE (°C)
100 120
Figure 2. Comparator Thresholds vs. Temperature
Rev. 0
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