CN708 datasheet(5/14 Pages) CONSONANCE

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CONSONANCE

Pin Description：

Pin No.

CN705

CN706X

CN707

CN708X

CN813X

CN706P

Name

Function Description

Manual reset input. When voltage at

pulled low, a reset pulse will be triggered. The

active low input has a pull up current. It can be

driven by TTL or CMOS logic as well as

shorted to GND with a switch.

VCC

Positive supply input

GND

Negative supply input

PFI

Power fail monitor input. When the voltage at

PFI is below 1.22V，PFO goes low . Connect

PFI to GND or VCC when not used.

PFO

Power fail monitor output. When the voltage at

PFI is less than 1.22V, PFO goes low; otherwise

PFO goes high.

WDI

Watchdog input. If WDI remains high or low

for 1.6s, the on chip watchdog timer runs out

and

WDO

goes

low.

Floating

WDI

connecting WDI to high impedance three state

buffer

disables

watchdog

function.

The

watchdog timer clears whenever RESET

asserted, or WDI is three stated, or WDI sees a

rising or falling edge.

RESET

Active low reset output.

stays in low

if VCC is lower than reset threshold; it remains

in low for 200ms after VCC becomes higher

than reset threshold or

goes from low to

high.(Figure 5）

WDO

Watchdog output. WDO goes low if watchdog

timer finishes its 1.6s count, and will not go

high again until the watchdog timer is cleared.

Whenever VCC is below reset threshold, WDO

stays low, and as soon as VCC rises above reset

threshold, WDO goes high without delay.

RESET

Active high reset output. RESET

stays in high

if VCC is lower than reset threshold; it remains

in high for 200ms after VCC becomes higher

than reset threshold or

goes from low to

high.(Figure 5)

Rev.1

CN708 Datasheet(PDF) 5 Page - Shanghai Consonance Electronics Incorporated

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