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

The MAX6884/MAX6885 feature a watchdog timer with

programmable initial and normal timeout periods from

6.25ms to 102.4s. WDO asserts when WDI is not tog-

gled from high-to-low or low-to-high within the appro-

priate watchdog timeout period. Program WDO to

assert RESET.

Program the MAX6884/MAX6885 to receive power

through IN1–IN4 or VCC (see the Powering the

MAX6884/MAX6885 section). Outputs remain asserted

while the voltage that is supplying the device is below

UVLO (2.5V) and above 1V (see Figure 1).

Table 1. Programmable Features

FEATURE

Input Voltages IN1–IN6

Programmable Output RESET

Programmable Output UV/OV

Programmable Output WDO

Watchdog Timer

VCC Power Mode

Manual Reset Input MR

Reference Input REFIN

DESCRIPTION

• Primary undervoltage threshold

• Secondary undervoltage or overvoltage threshold

• 1V to 5.8V thresholds in 20mV increments

• 0.5V to 3.05V thresholds in 10mV increments

• 0.1667V to 1.017V thresholds in 3.3mV increments in high-impedance mode

• Dependency on IN1–IN6, MR, UV/OV, and/or WDO

• Active-low, weak pullup, or open-drain output

• Programmable timeout periods of 25µs, 1.5625ms, 6.25ms, 25ms, 50ms, 200ms, 400ms, or

1.6s

• Dependency on IN1–IN6, MR, and/or RESET

• Active-low, weak pullup, or open-drain output

• Programmable timeout periods of 25µs, 1.5625ms, 6.25ms, 25ms, 50ms, 200ms, 400ms, or

1.6s

• Active-low, weak pullup, or open-drain output

• Initial watchdog timeout period of 6.25ms, 25ms, 100ms, 400ms, 1.6s, 6.4s, 25.6s, or 102.4s

• Normal watchdog timeout period of 6.25ms, 25ms, 100ms, 400ms, 1.6s, 6.4s, 25.6s, or 102.4s

• Watchdog enable/disable

• Programs whether the device is powered from the highest IN_ input or from an external supply

connected to VCC

• Program RESET or UV/OV to assert while MR is asserted

• Internal +1.25V reference voltage

• Goes high impedance when internal reference is selected

• External reference voltage input from 1.225V to 1.275V

• Sets ADC voltage range

10-Bit ADC*

• Samples voltages at IN1–IN6, AUXIN, and VCC

• Completes conversion of all eight inputs in 200ms

• Reference voltage sets ADC range

• Read ADC data from SMBus/I2C interface

Write Disable

Configuration Lock

• Locks user EEPROM based on RESET or UV/OV assertion

• Locks configuration registers and EEPROM

*ADC does not affect programmable outputs.

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