MAX6886 データシートの表示（PDF） - Maxim Integrated

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MAX6886

Pin-Selectable, Hex Power-Supply Supervisory Circuit

Maxim Integrated 

Pin-Selectable, Hex Power-Supply

Supervisory Circuit

Pin Description (continued)

PIN

NAME

FUNCTION

4

GND Ground

Watchdog Timer Input. Logic input for the watchdog timer function. If WDI is not strobed with a valid

5

WDI

low-to-high or high-to-low transition within the selected timeout period, RESET asserts. WDI is

internally pulled down to GND through a 10µA current sink.

Active-Low Manual Reset Input. Pull MR low to assert RESET. RESET will remain asserted for its

6

MR

preset/adjustable reset timeout period when MR is driven high. Leave MR unconnected or connect to

DBP if unused. MR is internally pulled up to DBP through a 10µA current source.

Margin Input. When MARGIN is pulled low, RESET is held in its existing state independent of

7

MARGIN

subsequent changes in monitored input voltages or the watchdog timer expiration. MARGIN is

internally pulled up to DBP through a 10µA current source. MARGIN overrides MR if both are asserted

at the same time.

8

TH4

Threshold Selection Input 4. Logic input to select desired threshold. Connect TH4 to GND or DBP.

See Table 2 for available thresholds. Input has no internal pullup or pulldown.

9

TH3

Threshold Selection Input 3. Logic input to select desired threshold. Connect TH3 to GND or DBP.

See Table 2 for available thresholds. Input has no internal pullup or pulldown.

10

TH2

Threshold Selection Input 2. Logic input to select desired threshold. Connect TH2 to GND or DBP.

See Table 2 for available thresholds. Input has no internal pullup or pulldown.

11

TH1

Threshold Selection Input 1. Logic input to select desired threshold. Connect TH1 to GND or DBP.

See Table 2 for available thresholds. Input has no internal pullup or pulldown.

12

TH0

Threshold Selection Input 0. Logic input to select desired threshold. Connect TH0 to GND or DBP.

See Table 2 for available thresholds. Input has no internal pullup or pulldown.

Internal Power-Supply Voltage. Bypass VCC to GND with a 1µF ceramic capacitor as close to the

13

VCC

device as possible. VCC supplies power to the internal circuitry. VCC is internally powered from the

highest of the monitored IN1–IN4 voltages. Do not use VCC to supply power to external circuitry. To

externally supply VCC, see the Powering the MAX6886 section.

Digital Bypass Voltage. The internally generated voltage at DBP supplies power to internal logic and

14

DBP

output RESET. Connect a 1µF capacitor from DBP to GND as close to the device as possible. Do not

use DBP to supply power to external circuitry.

Input Voltage Detector 6. Select the undervoltage threshold using TH0–TH4. See Table 2. IN6 cannot

15

IN6

supply power to the device. For improved noise immunity, bypass IN6 to GND with a 0.1µF capacitor

installed as close to the device as possible.

Input Voltage Detector 5. Select the undervoltage threshold using TH0–TH4. See Table 2. IN5 cannot

16

IN5

supply power to the device. For improved noise immunity, bypass IN5 to GND with a 0.1µF capacitor

installed as close to the device as possible.

Input Voltage Detector 4. Select the undervoltage threshold using TH0–TH4. See Table 2. For

17

IN4

improved noise immunity, bypass IN4 to GND with a 0.1µF capacitor installed as close to the device

as possible. Power the device through IN1–IN4 or VCC (see the Powering the MAX6886 section).

Input Voltage Detector 3. Select the undervoltage threshold using TH0–TH4. See Table 2. For

18

IN3

improved noise immunity, bypass IN3 to GND with a 0.1µF capacitor installed as close to the device

as possible. Power the device through IN1–IN4 or VCC (see the Powering the MAX6886 section).

Input Voltage Detector 2. Select the undervoltage threshold using TH0–TH4. See Table 2. For

19

IN2

improved noise immunity, bypass IN2 to GND with a 0.1µF capacitor installed as close to the device

as possible. Power the device through IN1–IN4 or VCC (see the Powering the MAX6886 section).

Input Voltage Detector 1. Select the undervoltage threshold using TH0–TH4. See Table 2. For

20

IN1

improved noise immunity, bypass IN1 to GND with a 0.1µF capacitor installed as close to the device

as possible. Power the device through IN1–IN4 or VCC (see the Powering the MAX6886 section).

—

EP

Exposed Paddle. Internally connected to GND. Connect EP to GND or leave unconnected.

6 _______________________________________________________________________________________

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