MIC2755 datasheet(2/12 Pages) MICREL

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MIC2755

Micrel

MIC2755

February 2000

Pin Description

Pin Number

Pin Name

Pin Function

RTH(/MR)

Power-On Reset Threshold (Analog Input): Comparator input assigned to

battery-OK condition detection. When the level on this pin first exceeds

REF, the reset generator cycles. The /RST output is held low for a minimum

of 700ms and the /POF threshold output is deasserted.

NTH

Nonmaskable Interrupt Threshold (Analog Input): Voltage monitor input

assigned to “low battery” condition detection. When the level on this pin falls

below V

REF, the /NMI output is asserted.

PTH

Power-Off Threshold (Analog Input): Voltage monitor input assigned to

“dead battery” condition detection. When the level on this pin falls below

REF, the /RST and /POF outputs are asserted. The condition is latched until

a reset cycle occurs (V

RTH > VREF).

GND

Ground: Power and signal return for all IC functions.

/POF

Power-off (Output): Active-low, open-drain output. Asserted and latched

when V

PTH < VREF, which is a “dead battery” condition. The system is held

in reset until the battery is replaced and a power-on reset cycle occurs.

/NMI

Nonmaskable Interrupt (Output): Active-low, open-drain output. Asserted

when V

NTH < VREF, which is a “low battery” condition. This indicates high-

power system operation should not be allowed.

/RST

Reset (Output): Active-low, open-drain output. Asserted for a minimum of

700ms at power-on or anytime V

PTH drops below VREF. Also asserted for

175ms minimum when RTH (/MR) is externally pulled low (manual reset).

VDD

(Analog Input): Power supply input.

Pin Configuration

RTH(/MR)

NTH

PTH

GND

VDD

/RST

/NMI

/POF

8-Lead MSOP (MM)

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