PIC12F635/PIC16F636/639
The PLVD module includes the following capabilities:
8.0
PROGRAMMABLE
LOW-VOLTAGE DETECT
(PLVD) MODULE
• Eight programmable trip points
• Interrupt on falling VDD
• Stable reference indication
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.
• Operation during Sleep
A Block diagram of the PLVD module is shown in
Figure 8-1.
FIGURE 8-1:
PLVD BLOCK DIAGRAM
8 Stages
VDD
8-to-1
Analog MUX
LVDEN
0
1
2
+
-
LVDIF
det
6
7
LVDL<2:0>
Reference
Voltage
Generator
FIGURE 8-2:
PLVD OPERATION
VDD
PLVD Trip Point
LVDIF
Cleared by
Software
Set by
Hardware
© 2007 Microchip Technology Inc.
DS41232D-page 87
MICROCHIP [ MICROCHIP ]
