MAX6885 データシートの表示（PDF） - Maxim Integrated

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MAX6885

EEPROM-Programmable, Hex Power-Supply Supervisory Circuits

Maxim Integrated 

EEPROM-Programmable, Hex

Power-Supply Supervisory Circuits

UV/OV

Program UV/OV to depend on MR, RESET, or any pro-

grammable secondary voltage detector input (see Table

7). As an example, UV/OV may depend on the IN1 sec-

ondary overvoltage threshold, MR, and RESET. Write 1’s

to R13h[2:0] and R0Eh[1] to configure as indicated. IN1

must be below the overvoltage threshold, MR must be

high, and RESET must be deasserted to be a logic “1,”

Table 7. Programmable UV/OV Options

then UV/OV deasserts. The logic state of UV/OV, in this

example, is equivalent to the logical statement:

IN1 · MR · RESET

UV/OV remains low for its programmed time delay (tUP)

after all assertion-causing conditions are removed.

Program time delays for UV/OV from 25µs to 1600ms

(see Table 7). Configure UV/OV for open drain or weak

pullup through bit R14h[0].

EEPROM

REGISTER

ADDRESS

MEMORY

ADDRESS

BIT RANGE

DESCRIPTION

[0]

1 = UV/OV Assertion Depends on MR

0 = UV/OV Assertion Does Not Depend on MR

13h

93h

[1]

1 = UV/OV Assertion Depends on RESET

0 = UV/OV Assertion Does Not Depend on RESET

1 = UV/OV Assertion Depends on IN1 Secondary Undervoltage/Overvoltage Threshold

[2]

0 = UV/OV Assertion Does Not Depend on IN1 Secondary Undervoltage/Overvoltage

Threshold

1 = UV/OV Assertion Depends on IN2 Secondary Undervoltage/Overvoltage Threshold

[3]

0 = UV/OV Assertion Does Not Depend on IN2 Secondary Undervoltage/Overvoltage

Threshold

1 = UV/OV Assertion Depends on IN3 Secondary Undervoltage/Overvoltage Threshold

[4]

0 = UV/OV Assertion Does Not Depend on IN3 Secondary Undervoltage/Overvoltage

Threshold

1 = UV/OV Assertion Depends on IN4 Secondary Undervoltage/Overvoltage Threshold

[5]

0 = UV/OV Assertion Does Not Depend on IN4 Secondary Undervoltage/Overvoltage

Threshold

1 = UV/OV Assertion Depends on IN5 Secondary Undervoltage/Overvoltage Threshold

[6]

0 = UV/OV Assertion Does Not Depend on IN5 Secondary Undervoltage/Overvoltage

Threshold

1 = UV/OV Assertion Depends on IN6 Secondary Undervoltage/Overvoltage Threshold

[7]

0 = UV/OV Assertion Does Not Depend on IN6 Secondary Undervoltage/Overvoltage

Threshold

UV/OV Output Type

[0]

1 = Open Drain

0 = Weak Pullup

UV/OV Deassertion Time Delay

000 = 25µs

14h

94h

001 = 1.56ms

010 = 6.25ms

[3:1]

011 = 25ms

100 = 50ms

101 = 200ms

110 = 400ms

111 = 1600ms

[7:4]

Unused

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