AMS810M datasheet(2/8 Pages) AMS

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Pin Configuration

Pin Description

Type

Description

VCC

Supply Voltage. Reset is asserted when VCC drops below the Reset Threshold Voltage (VRST). Reset

remains asserted until VCC rises above VRST and keep asserted for the duration of the Reset Timeout

Period (tRS) once VCC rises above VRST.

GND

Ground

RESET

Active-Low Reset Output (Push-Pull). It goes low when Vcc is below the reset threshold. It remains

low for about 200ms after Vcc rises above the reset threshold (VRST).

Functional Description

Reset Output

A microprocessor (

µP) reset input starts the µP in a known state. Whenever the µP is in an unknown state, it should be held in

reset. The supervisory circuits assert reset during power-up and prevent code execution errors during power-down or brownout

conditions.

On power-up, once Vcc reaches about 1.0V, /RESET is a guaranteed logic low of 0.4V or less. As Vcc rises, /RESET stays low.

When Vcc rises above the reset threshold, an internal timer releases /RESET after about 200ms. /RESET pulses low whenever

Vcc drops below the reset threshold, i.e. brownout condition. If brownout occurs in the middle of a previously initiated reset pulse,

guaranteed to be 0.4V or less until Vcc drops below 1.0V. Reset Timing Diagram shows the timing relationship.

VCC

GND

RESET

SOT23-3

AMS803/09/10XT

AMS803/09/10

Advanced Monolithic Systems http://www.ams-semitech.com

AMS810M Datasheet(PDF) 2 Page - Advanced Monolithic Systems Ltd