MAX6876 查看數據表（PDF） - Maxim Integrated

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MAX6876

EEPROM-Programmable, Quad, Power-Supply Tracker/Sequencer Circuit

Maxim Integrated 

EEPROM-Programmable, Quad,

Power-Supply Tracker/Sequencer Circuit

Table 3. Program Power-Down and Power-Up

REGISTER

ADDRESS

13h

0Ah

EEPROM MEMORY

ADDRESS

33h

2Ah

BIT RANGE

DESCRIPTION

[7:3]

[7:6]

[5:4]

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

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

“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

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

Table 4. Setting the Slew Rate

REGISTER

ADDRESS

12h

EEPROM MEMORY

ADDRESS

32h

BIT RANGE

DESCRIPTION

Bit [7:6]

“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

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

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_:

x = VTH - 1V

0.02V

for +1V to +5.5V range.

x = VTH - 0.5V

0.01V

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.

18 ______________________________________________________________________________________

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