MAX6876 datasheet(18/39 Pages) MAXIM

18 / 39 page

EEPROM-Programmable, Quad,

Power-Supply Tracker/Sequencer Circuit

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Inputs

IN1–IN4

The IN1–IN4 voltage detectors monitor voltages from

1V to 5.5V in 20mV increments, or +0.5V to +3.05V in

10mV increments. Use the following equations to set

the threshold voltages for IN_:

for +1V to +5.5V range.

for +0.5V to +3.05V range.

where VTH is the desired threshold voltage and x is the

decimal code for the desired threshold (Table 6). For

the +1V to +5.5V range, x must equal 225 or less; oth-

erwise, the threshold exceeds the maximum operating

voltage of IN1–IN4 (Table 6). An overvoltage or under-

voltage failure on an IN_ input immediately shuts down

all the OUT_ outputs and generates a FAULT in the

master/slave condition.

-.5

001

-1

002

ADDRESS

EEPROM MEMORY

ADDRESS

BIT RANGE

DESCRIPTION

Bit 7—If 1, reverse order of track/sequence power-down

If 0, GATE_ fast pulldown

Bit 6—If 1, OUT1 charges with internal pulldown

If 0, no pulldown is allowed

Bit 5—If 1, OUT2 charges with internal pulldown

If 0, no pulldown is allowed

Bit 4—If 1, OUT3 charges with internal pulldown

If 0, no pulldown is allowed

13h

33h

[7:3]

Bit 3—If 1, OUT4 charges with internal pulldown

If 0, no pulldown is allowed

“00” fault power-up timer value = 25ms

“01” fault power-up timer value = 50ms

“10” fault power-up timer value = 100ms

[7:6]

“11” fault power-up timer value = 200ms

“00” fault power-down timer value = 25ms

“01” fault power-down timer value = 50ms

“10” fault power-down timer value = 100ms

0Ah

2Ah

[5:4]

“11” fault power-down timer value = 200ms

Table 3. Program Power-Down and Power-Up

ADDRESS

EEPROM MEMORY

ADDRESS

BIT RANGE

DESCRIPTION

“00” track/sequence slew rate (rise or fall) = 800V/s

“01” track/sequence slew rate (rise or fall) = 400V/s

“10” track/sequence slew rate (rise or fall) = 200V/s

12h

32h

Bit [7:6]

“11” track/sequence slew rate (rise or fall) = 100V/s

Table 4. Setting the Slew Rate

MAX6876 Datasheet(PDF) 18 Page - Maxim Integrated Products

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