MAX6875 データシートの表示（PDF） - Maxim Integrated

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MAX6875

EEPROM-Programmable, Hex/Quad, Power-Supply Sequencers/Supervisors

Maxim Integrated 

EEPROM-Programmable, Hex/Quad,

Power-Supply Sequencers/Supervisors

Table 7. PO1 (MAX6874 Only) Output Dependency

REGISTER

ADDRESS

EEPROM

MEMORY

ADDRESS

0Eh

800Eh

0Fh

800Fh

10h

8010h

11h

8011h

40h

8040h

BIT

[0]

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[5:0]

[6]

[7]

[0]

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[0]

[0]

OUTPUT ASSERTION CONDITIONS

1 = PO1 assertion depends on IN1 undervoltage threshold (Table 2).

1 = PO1 assertion depends on IN2 undervoltage threshold (Table 3).

1 = PO1 assertion depends on IN3 undervoltage threshold (Table 4).

1 = PO1 assertion depends on IN4 undervoltage threshold (Table 4).

1 = PO1 assertion depends on IN5 undervoltage threshold (Table 4).

1 = PO1 assertion depends on IN6 undervoltage threshold (Table 4).

1 = PO1 assertion depends on watchdog (Tables 19 and 20).

Must be set to 0.

Must be set to 0.

1 = PO1 assertion depends on GPI1 (Table 5).

1 = PO1 assertion depends on GPI2 (Table 5).

1 = PO1 assertion depends on GPI3 (Table 5).

1 = PO1 assertion depends on GPI4 (Table 5).

1 = PO1 assertion depends on PO2 (Table 8).

1 = PO1 assertion depends on PO3 (Table 9).

1 = PO1 assertion depends on PO4 (Table 10).

1 = PO1 assertion depends on PO5 (Table 11).

1 = PO1 assertion depends on PO6 (Table 12).

1 = PO1 assertion depends on PO7 (Table 13).

1 = PO1 assertion depends on PO8 (Table 14).

1 = PO1 asserts when MR = low (Table 6).

on no condition always remains in its active state (Table

19). An output configured as active-high is considered

asserted when that output is logic high. No output can

depend solely on MR.

The voltage monitors generate fault signals (logical 0) to

the MAX6874/MAX6875s’ logic array when an input volt-

age is below the programmed undervoltage threshold.

Registers 0Eh through 3Ah and 40h configure each of the

programmable outputs. Programmable timing blocks set

the PO_ timeout period from 25µs to 1600ms for each

programmable output. See register 3Ah (Table 15) to set

the active state (active-high or active-low) for each pro-

grammable output and Table 16 for timeout periods for

each output.

For example, PO3 (MAX6874—Table 9) may depend on

the IN1 undervoltage threshold, and the states of GPI1,

PO1, and PO2. Write a one to R16h[0], R17h[6], and

R18h[3:2] to configure the output as indicated. IN1 must

be above the undervoltage threshold (Table 2), GPI1

must be inactive (Table 5), and PO1 (Tables 7 and 15)

and PO2 (Table 9) must be in their deasserted states for

the output to deassert.

Table 7 only applies to PO1 of the MAX6874. Write a 0

to a bit to make the PO1 output independent of the

respective signal (IN1–IN6 thresholds, WD, GPI1–GPI4,

MR, or other programmable outputs).

16 ______________________________________________________________________________________

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