MAX6872 データシートの表示（PDF） - Maxim Integrated

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MAX6872

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

Maxim Integrated 

EEPROM-Programmable, Hex/Quad,

Power-Supply Sequencers/Supervisors

Table 8. PO1 (MAX6872 Only) Output Dependency

REGISTER

ADDRESS

EEPROM

MEMORY

ADDRESS

BIT

OUTPUT ASSERTION CONDITIONS

0Eh

800Eh

0Fh

800Fh

10h

8010h

11h

8011h

40h

8040h

[0]

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

[1]

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

[2]

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

[3]

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

[4]

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

[5]

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

[6]

1 = PO1 assertion depends on watchdog 1 (Tables 25 and 26).

[7]

1 = PO1 assertion depends on watchdog 2 (Tables 25 and 26).

[0]

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

[1]

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

[2]

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

[3]

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

[4]

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

[5]

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

[6]

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

[7]

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

[0]

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

[1]

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

[2]

1 = PO1 assertion depends on PO2 (Table 9).

[3]

1 = PO1 assertion depends on PO3 (Tables 10 and 11).

[4]

1 = PO1 assertion depends on PO4 (Tables 12 and 13).

[5]

1 = PO1 assertion depends on PO5 (Tables 14 and 15).

[6]

1 = PO1 assertion depends on PO6 (Tables 16 and 17).

[7]

1 = PO1 assertion depends on PO7 (Table 18).

[0]

1 = PO1 assertion depends on PO8 (Table 19).

[0]

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

for each programmable output. See register 3Ah (Table

20) to set the active state (active-high or active-low) for

each programmable output and registers 11h, 15h,

1Ch, 23h, 2Ah, 31h, 35h, and 39h to select the output

stage types (Tables 21 and 22), and PO_ timeout peri-

ods (Table 23) for each output.

Control selected programmable outputs with a sum of

products (Tables 8–19). Each product allows a different

set of conditions to assert each output. Outputs PO3

(MAX6872)/PO1 (MAX6873) and PO6 (MAX6872)/

PO4 (MAX6873) allow two sets of different conditions to

assert each output. Outputs PO1 and PO2 (MAX6872

only), PO7 (MAX6872)/PO5 (MAX6873), and PO8

(MAX6872 only) allow only one set of conditions to

assert each output.

For example, Product 1 of the PO3 (MAX6872—Table

10) programmable output may depend on the IN1 pri-

mary undervoltage threshold, and the states of GPI1,

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

R18h[3:2] to configure Product 1 as indicated. IN1

must be above the primary undervoltage threshold

(Table 2), GPI1 must be inactive (Table 5), and PO1

(Tables 8 and 20) and PO2 (Tables 10 and 21) must

be in their deasserted states for Product 1 to be a logi-

cal 1. Product 1 is equivalent to the logic statement:

V1A • GPI1 • PO1 • PO2.

Product 2 of PO3 (MAX6872, Table 11) may depend on

an entirely different set of conditions, or the same condi-

tions, depending on the system requirements. For

example, Product 2 may depend on the IN1 undervolt-

18 ______________________________________________________________________________________

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