PIC18LF4331T-I/SO View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC18LF4331T-I/SO

28/40/44-Pin Enhanced Flash Microcontrollers with nanoWatt Technology, High-Performance PWM and A/D

Microchip Technology 

PIC18F2331/2431/4331/4431

22.4 LVD Start-up Time

The internal reference voltage of the LVD module,

specified in electrical specification Parameter D420,

may be used by other internal circuitry, such as the

Programmable Brown-out Reset. If the LVD, or other

circuits using the voltage reference, are disabled to

lower the device’s current consumption, the reference

voltage circuit will require time to become stable before

a low-voltage condition can be reliably detected. This

start-up time, TIRVST, is an interval that is independent

of device clock speed. It is specified in electrical

specification Parameter 36.

The LVD interrupt flag is not enabled until TIRVST has

expired and a stable reference voltage is reached. For

this reason, brief excursions beyond the set point may

not be detected during this interval (refer to Figure 22-2).

FIGURE 22-2:

LOW-VOLTAGE DETECT WAVEFORMS

CASE 1:

VDD

LVDIF may not be set

LVDIF

Enable LVD

Internally Generated

Reference Stable

TIRVST

VLVD

LVDIF cleared in software

CASE 2:

VDD

LVDIF

Enable LVD

Internally Generated

Reference Stable

VLVD

TIRVST

LVDIF cleared in software

LVDIF cleared in software,

LVDIF remains set since LVD condition still exists

DS39616D-page 260

 2010 Microchip Technology Inc.

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