MAX6872 datasheet(13/48 Pages) MAXIM

13 / 48 page

EEPROM-Programmable, Hex/Quad,

Power-Supply Sequencers/Supervisors

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Table 1. Programmable Features

FEATURE

DESCRIPTION

High-Voltage Input

(IN1)

• Primary undervoltage threshold

• Secondary overvoltage or undervoltage threshold

• +2.5V to +13.2V threshold in 50mV increments

• +1.25V to +7.625V threshold in 25mV increments

Bipolar-Voltage Input

(IN2)

• Primary undervoltage threshold

• Secondary overvoltage or undervoltage threshold

• ±2.5V to ±15.25V threshold in 50mV increments

• ±1.25V to ±7.625V threshold in 25mV increments

Positive-Voltage Input

IN3–IN6 (MAX6872),

IN3–IN4 (MAX6873)

• Primary undervoltage threshold

• Secondary overvoltage or undervoltage threshold

• +1V to +5.5V threshold in 20mV increments

• +0.5V to +3.05V threshold in 10mV increments

Programmable Outputs

PO1–PO4 (MAX6872),

PO1–PO2 (MAX6873)

• Active high or active low

• Open-drain, weak pullup, or charge-pump output

• Weak pullup to IN3–IN6 (IN3 or IN4 for MAX6873) or ABP

• Dependent on MR, MARGIN, IN_, GPI1–GPI4 , WD1 and WD2, and/or PO_

• Programmable timeout periods of 25µs, 1.5625ms, 6.25ms, 25ms, 50ms, 200ms, 400ms, or 1.6s

Programmable Outputs

PO5–PO8 (MAX6872),

PO3–PO5 (MAX6873)

• Active high or active low

• Open-drain, weak pullup, or push-pull output

• Weak pullup to IN3–IN6 (IN3 or IN4 for MAX6873) or ABP

• Push-pull to IN3–IN6 (IN3 or IN4 for MAX6873)

• Dependent on MR, MARGIN, IN_, GPI1–GPI4 , WD1 and WD2, and/or PO_

• Programmable timeout periods of 25µs, 1.5625ms, 6.25ms, 25ms, 50ms, 200ms, 400ms, or 1.6s

General-Purpose Logic

Inputs (GPI1–GPI4)

• Active high or active low logic levels

• Configure GPI_ as inputs to watchdog timers or programmable output stages

Watchdog Timers

• Clear dependent on any combination of one GPI_ input and one programmable output, a GPI_ input

only, or a programmable output only

• Initial watchdog timeout period of 6.25ms, 25ms, 100ms, 400ms, 1.6s, 6.4s, 25.6s, or 102.4s

• Normal watchdog timeout period of 6.25ms, 25ms, 100ms, 400ms, 1.6s, 6.4s, 25.6s, or 102.4s

• Watchdog enable/disable

• Initial watchdog timeout period enable/disable

Manual Reset Input

(MR)

• Forces PO_ into the active output state when MR = GND

• PO_ deassert after MR releases high and the PO_ timeout period expires

• PO_ cannot be a function of MR only

Margining Input

(MARGIN)

• Holds PO_ in existing state or asserts PO_ to a programmed output state, independent of changes in

monitored inputs or watchdog timers, when MARGIN = GND

• Overrides MR when both assert at the same time

Write Disable

• Locks user EEPROM based on PO_

Configuration Lock

• Locks configuration EEPROM

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