ISL88706IP831Z datasheet(8/15 Pages) INTERSIL

Part #	ISL88706IP831Z

Description	uP Supervisor with Watchdog Timer, Power-Fail Comparator, Manual Reset and Adjustable Power-On Reset

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Manufacturer	INTERSIL [Intersil Corporation]

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8

FN8092.5

January 12, 2009

.

Manual Reset

The manual-reset input (MR) allows the user to trigger a

reset by using a push-button switch. The MR input is an

active low debounced input. By connecting a push-button

directly from MR to ground, the designer adds manual

system reset capability (see Figure 4). Reset is asserted if

the MR pin is pulled low to less than 100mV for the minimum

MR pulse width or longer while the push-button is closed.

After MR is released, the reset outputs remain asserted for

tPOR (200ms) and then released.

Watchdog Timer

The Watchdog Timer circuit checks microprocessor activity

by monitoring the WDI input pin. The microprocessor must

periodically toggle the WDI pin within tWDT (typically ~1.6s),

otherwise the WDO pin pulls low (see Figure 5). The WDO

then signals reset periodically (typically ~1.9s) for ~220ms

until the WDI is again toggled. Internally, the 1.6s timer is

cleared by either a reset or by toggling the WDI input, which

can detect pulses longer than 50ns.

Whenever there is a low-voltage VDD condition, WDO goes

low. Unlike the reset outputs, however, WDO does not have

a minimum reset pulse width (tPOR). WDO goes high as

soon as VDD rises above its voltage trip point (see Figure 5).

With WDI open or connected to a tristated high impedance

input, the Watchdog Timer is disabled and only pulls low

when VDD < VTH1.

ISL88707, ISL88708

FIGURE 3. ADJUSTING tPOR WITH A CAPACITOR

CPOR (pF)

CPOR

0

2

4

6

8

10

12

14

010

20

30

40

50

60

70

80

90

100

NORMALIZED tPOR vs CPOR (pF)

OPEN = 200ms

MR

PB

20k

FIGURE 4. CONNECTING A MANUAL RESET PUSH-BUTTON

ISL8870x

ISL88705, ISL88706, ISL88707, ISL88708, ISL88716, ISL88813

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ISL88706IP831Z Datasheet(PDF) 8 Page - Intersil Corporation

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