MAX6366 查看數據表（PDF） - Maxim Integrated

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MAX6366

SOT23 / Low-Power P Supervisory Circuits with Battery Backup and Chip-Enable Gating

Maxim Integrated 

SOT23, Low-Power µP Supervisory Circuits

with Battery Backup and Chip-Enable Gating

watchdog is set low in the beginning of the program,

set high at the beginning of every subroutine or loop,

and set low again when the program returns to the

beginning. If the program should hang in any subrou-

tine, the problem would be quickly corrected.

Replacing the Backup Battery

When VCC is above VTH, the backup power source can

be removed without danger of triggering a reset pulse.

The device does not enter battery-backup mode when

VCC stays above the reset threshold voltage.

Negative-Going VCC Transients

These supervisors are relatively immune to short-dura-

tion, negative-going VCC transients. Resetting the µP

when VCC experiences only small glitches is usually not

desirable.

The Typical Operating Characteristics section has a

Maximum Transient Duration vs. Reset Threshold

Overdrive graph for which reset is not asserted. The

graph was produced using negative-going VCC pulses,

starting at VCC and ending below the reset threshold by

the magnitude indicated (reset threshold overdrive).

The graph shows the maximum pulse width that a neg-

ative-going VCC transient can typically have without

triggering a reset pulse. As the amplitude of the tran-

sient increases (i.e., goes further below the reset

threshold), the maximum allowable pulse width

decreases. Typically, a VCC transient that goes 100mV

below the reset threshold and lasts for 30µs will not trig-

ger a reset pulse.

A 0.1µF bypass capacitor mounted close to the VCC

pin provides additional transient immunity.

+2.4V TO +5.5V

0.1µF

START

VCC BATT ON

OUT

BATT CE OUT

CE

MAX6367

CE IN

ADDRESS

DECODE

GND

RESET

CMOS RAM

A0–A15

µP

RESET

Figure 3. MAX6367 BATT ON Driving an External Pass

Transistor

SET

WDI

LOW

SUBROUTINE

OR PROGRAM LOOP

SET WDI

HIGH

RETURN

END

Figure 4. Watchdog Flow Diagram

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