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MIC2755

Description
Battery System Supervisor
File Size638KB,12 Pages
ManufacturerMicrochip
Websitehttps://www.microchip.com
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MIC2755 Overview

Battery System Supervisor

MIC2755
Battery Operated Supervisor
General Description
The MIC2755 is composed of multiple comparators, a
reset pulse generator, and logic. It is designed for
monitoring the battery supply of portable digital systems,
including PDAs and pagers.
The MIC2755 can detect three different battery states:
battery OK, low battery, and dead battery. The reset
(/RST) output is asserted for at least 700ms when a fresh
battery is inserted. The non-maskable interrupt output
(/NMI) is asserted when the battery voltage is below the
NTH threshold, indicating that high-power system
operations should not occur. If and when battery voltage
falls below the power-off threshold (PTH), the reset output
is asserted and latched, inhibiting system operation until
the battery is replaced or recharged.
All three voltage thresholds are set using external
resistors. A manual reset function can be implemented by
connecting a switch directly to the power on reset/manual
reset [RTH(/MR)] input. Internal circuitry detects switch
activation and generates a minimum 175ms debounced
reset signal. The MIC2755’s power supply input is
separate from the detector inputs to allow it to be powered
from a down-stream voltage, such as the output of a boost
converter.
Inputs and outputs can be pulled above VDD (up to 7V
absolute maximum) without adverse effects or excessive
current draw.
Supply current is typically a low 2μA. Hysteresis is
included on all voltage detectors to prevent chattering due
to noise. The MIC2755 is available in the tiny 8-pin micro-
small-outline package.
Datasheets and support documentation are available on
Micrel’s web site at:
www.micrel.com.
Features
Optimized for PDAs, pagers, and other handheld
devices
Detects multiple battery states:
Battery OK
Low battery
Dead battery
Adjustable voltage thresholds
High accuracy ±2% voltage thresholds
Reset generation at power-on (700ms min.)
Debounced manual reset function
Internal logic prevents chatter if battery voltage
fluctuates
Extremely low 2μA typical supply current
I/Os can be pulled above VDD (7V absolute maximum)
Immune to brief power supply transients
Low cost
8-pin MSOP
Typical Application
Supervised Boost Converter and Microcontroller or Microprocessor
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 •
http://www.micrel.com
May 21, 2015
Revision 2.0

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