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 14. PO8 (MAX6874 only) Output Dependency

REGISTER

ADDRESS

EEPROM

MEMORY

ADDRESS

36h

8036h

37h

8037h

38h

8038h

39h

8039h

40h

8040h

BIT

[0]

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[5:0]

[6]

[7]

[0]

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[0]

[7]

OUTPUT ASSERTION CONDITIONS

1 = PO8 assertion depends on IN1 undervoltage threshold (Table 2).

1 = PO8 assertion depends on IN2 undervoltage threshold (Table 3).

1 = PO8 assertion depends on IN3 undervoltage threshold (Table 4).

1 = PO8 assertion depends on IN4 undervoltage threshold (Table 4).

1 = PO8 assertion depends on IN5 undervoltage threshold (Table 4).

1 = PO8 assertion depends on IN6 undervoltage threshold (Table 4).

1 = PO8 assertion depends on watchdog (Tables 18 and 19).

Must set to 0.

Must set to 0.

1 = PO8 assertion depends on GPI1 (Table 5).

1 = PO8 assertion depends on GPI2 (Table 5).

1 = PO8 assertion depends on GPI3 (Table 5).

1 = PO8 assertion depends on GPI4 (Table 5).

1 = PO8 assertion depends on PO1 (Table 7).

1 = PO8 assertion depends on PO2 (Table 8).

1 = PO8 assertion depends on PO3 (Table 9).

1 = PO8 assertion depends on PO4 (Table 10).

1 = PO8 assertion depends on PO5 (Table 11).

1 = PO8 assertion depends on PO6 (Table 12).

1 = PO8 assertion depends on PO7 (Table 13).

1 = PO8 asserts when MR = low (Table 6).

Table 14 only applies to PO8 of the MAX6874. Write a 0

to a bit to make the PO8 output independent of the

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

MR, or other programmable outputs).

Output Stage Configurations

Independently program each programmable output as

active-high or active-low (Table 15). All programmable

outputs of the MAX6874/MAX6875 are open-drain only.

See Table 16 to set the timeout period for each output.

Open-Drain Output Configuration

Connect an external pullup resistor from the program-

mable output to an external voltage when configured as

an open-drain output. PO1–PO4 (PO1 and PO2 for the

MAX6875) may be pulled up to +13.2V. PO5–PO8

(PO3–PO5 for the MAX6875) may be pulled up to a

voltage less than or equal to ABP. Choose the pullup

resistor depending on the number of devices connect-

ed to the open-drain output and the allowable current

consumption. The open-drain output configuration

allows wire-ORed connections, and provides flexibility

in setting the pullup current.

Configuring the MAX6874/MAX6875

The MAX6874/MAX6875 factory-default configuration

sets all EEPROM registers to 00h except register 3Ah,

which is set to FFh. This configuration sets all of the pro-

grammable outputs as active-high (putting all outputs

into high-impedance states until the device is reconfig-

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