PIC16F636T-I Datasheet, PDF (89/234 Pages) Microchip Technology – 8/14-Pin, Flash-Based 8-Bit CMOS Microcontrollers with nanoWatt Technology

PIC12F635/PIC16F636/639
8.0 PROGRAMMABLE
LOW-VOLTAGE DETECT
(PLVD) MODULE
The Programmable Low-Voltage Detect (PLVD)
module is a power supply detector which monitors the
internal power supply. This module is typically used in
key fobs and other devices, where certain actions
need to be taken as a result of a falling battery voltage.
FIGURE 8-1:
PLVD BLOCK DIAGRAM
8 Stages
The PLVD module includes the following capabilities:
• Eight programmable trip points
• Interrupt on falling VDD
• Stable reference indication
• Operation during Sleep
A Block diagram of the PLVD module is shown in
Figure 8-1.
VDD
LVDEN
FIGURE 8-2:
Reference
Voltage
Generator
PLVD OPERATION
VDD
PLVD Trip Point
8-to-1
Analog MUX
0
1
2
+
6
7
-
LVDL<2:0>
det
LVDIF
LVDIF
Set by
Hardware
Cleared by
Software
© 2007 Microchip Technology Inc.
DS41232D-page 87