MAX6884 データシートの表示（PDF） - Maxim Integrated

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MAX6884

EEPROM-Programmable, Hex Power-Supply Supervisory Circuits

Maxim Integrated 

EEPROM-Programmable, Hex

Power-Supply Supervisory Circuits

External Voltage-Divider

To achieve thresholds from 0.1667V to 1.0167V in

3.3mV increments, program the respective input voltage

detector for high impedance and use an external volt-

age-divider (see Figure 2). Set voltage-detector inputs

for high impedance by programming bits R10h[5:0].

Design the resistor voltage-divider to scale the input

voltage to between 0.1667V and 1.0167V at the input of

the device. In this way, voltages higher than 5.8V and in

between the 10mV and 20mV steps can be monitored.

Program R00h through R0Eh to adjust the thresholds

between 0.1667V and 1.0167V in 3.3mV steps.

AUXIN (MAX6884 Only)

The AUXIN high-impedance analog input is intended to

monitor additional system voltages not required for

reset purposes. The internal 10-bit ADC converts the

voltage at AUXIN and stores the data in the ADC regis-

ters (see Table 3). AUXIN does not affect any of the

programmable outputs. The AUXIN input accepts

power-supply voltages or other system voltages scaled

to the 1.25V ADC input voltage range.

VIN

IN_

MAX6884

MAX6885

MR

Program RESET and/or UV/OV to assert when manual

reset input MR is brought low (see Tables 5 and 6).

Outputs programmed to assert when MR is brought low

remain asserted after MR is brought high for their

respective programmed timeout periods. An internal

10µA current source pulls MR to VDBP. Leave MR

unconnected or connect to DBP if unused.

MARGIN

MARGIN allows system-level testing while power sup-

plies exceed the normal ranges. Drive MARGIN low to

hold the programmable outputs in their existing state

while system-level testing occurs. Leave MARGIN

unconnected or connect to DBP if unused. An internal

10µA current source pulls MARGIN to VDBP. The inter-

nal ADC continues to convert voltages while MARGIN is

low. The state of each programmable output does not

change while MARGIN = GND. MARGIN overrides MR

if both are asserted at the same time.

REFIN (MAX6884 Only)

The MAX6884/MAX6885 feature an internal 1.25V volt-

age reference. The voltage reference sets the threshold

of the voltage detectors and provides a reference volt-

age for the internal ADC. Program the MAX6884 to use

an internal or external reference by programming bit

R16h[7] (see Table 5). Leave REFIN unconnected

when using the internal reference. REFIN accepts an

external reference in the 1.225V to 1.275V range.

PRIMARY REGISTER

SECONDARY REGISTER

Table 5. Internal/External Reference

REGISTER

ADDRESS

EEPROM

MEMORY

ADDRESS

BIT

RANGE

DESCRIPTION

1 = Enable External

16h

96h

[7]

Reference

0 = Enable Internal

Reference

Figure 2. External Voltage-Divider Architecture

16 ______________________________________________________________________________________

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