PIC18F2455T-I/ML View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC18F2455T-I/ML

28/40/44-Pin, High-Performance, Enhanced Flash, USB Microcontrollers with nanoWatt Technology

Microchip Technology 

PIC18F2455/2550/4455/4550

FIGURE 24-3:

CASE 1:

HIGH-VOLTAGE DETECT OPERATION (VDIRMAG = 1)

HLVDIF may not be set

VDD

HLVDIF

VHLVD

Enable HLVD

IRVST

CASE 2:

VDD

TIRVST

Internal Reference is stable

HLVDIF cleared in software

VHLVD

HLVDIF

Enable HLVD

IRVST

TIRVST

Internal Reference is stable

HLVDIF cleared in software

HLVDIF cleared in software,

HLVDIF remains set since HLVD condition still exists

24.5 Applications

In many applications, the ability to detect a drop below

or rise above a particular threshold is desirable. For

example, the HLVD module could be periodically

enabled to detect Universal Serial Bus (USB) attach or

detach. This assumes the device is powered by a lower

voltage source than the USB when detached. An attach

would indicate a high-voltage detect from, for example,

3.3V to 5V (the voltage on USB) and vice versa for a

detach. This feature could save a design a few extra

components and an attach signal (input pin).

For general battery applications, Figure 24-4 shows a

possible voltage curve. Over time, the device voltage

decreases. When the device voltage reaches voltage,

VA, the HLVD logic generates an interrupt at time, TA.

The interrupt could cause the execution of an ISR,

which would allow the application to perform “house-

keeping tasks” and perform a controlled shutdown

before the device voltage exits the valid operating

range at TB. The HLVD, thus, would give the applica-

tion a time window, represented by the difference

between TA and TB, to safely exit.

FIGURE 24-4:

TYPICAL

HIGH/LOW-VOLTAGE

DETECT APPLICATION

VA

VB

Time TA TB

Legend: VA = HLVD trip point

VB = Minimum valid device

operating voltage

DS39632E-page 288

© 2009 Microchip Technology Inc.

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