T83C5121 datasheet(13/110 Pages) ATMEL

13 / 110 page

T8xC5121

4164E–SCR–02/04

PowerMonitor

The PowerMonitor function supervises the evolution of the voltages feeding the micro-

controller, and if needed, suspends its activity when the detected value is out of

specification.

It is guaranteed to start up properly when T8xC5121 is powered up and prevents code

execution errors when the power supply becomes lower than the functional threshold.

This section describes the functions of the PowerMonitor.

Description

In order to start up and to properly maintain the microcontroller operation, VDD has to be

stabilized in the VDD operating range and the oscillator has to be stabilised with a nomi-

nal amplitude compatible with logic threshold.

This control is carried out during three phases which are the power-up, normal operation

and stop. It complies with the following requirements:

•

It guarantees an operational Reset when the microcontroller is powered

•

and a protection if the power supply goes out from the functional range of the

microcontroller.

Figure 7. PowerMonitor Block Diagram

PowerMonitor Diagram

The target of the PowerMonitor is to survey the power supply in order to detect any volt-

age drops which are not in the target specification. This PowerMonitor block checks two

kind of situations that occur:

•

During the power-up condition, when VDD is reaching the product specification

•

During a steady-state condition, when V

DD is stable but disturbed by any

undesirable voltage drops.

Figure 8 shows some configurations that can be met by the PowerMonitor.

External

Power Supply

DC to DC

3V Regulator

VDD

DVCC

CVCC

Internal RESET

Power-fail

Detector

Power-up

Detector

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