Datasheet

© 2007 Microchip Technology Inc. DS41250F-page 171
PIC16F913/914/916/917/946
11.0 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.
The PLVD module includes the following capabilities:
• Eight programmable trip points
• Interrupt on falling V
DD
• Stable reference indication
• Operation during Sleep
A Block diagram of the PLVD module is shown in
Figure 11-1.
FIGURE 11-1: PLVD BLOCK DIAGRAM
FIGURE 11-2: PLVD OPERATION
LVDL<2:0>
8-to-1
8 Stages
LVDEN
VDD
7
6
2
1
0
Analog MUX
+
-
LVDIF
Voltage
Generator
det
Reference
PLVD Trip Point
LVDIF
VDD
Set by
Hardware
Cleared by
Software