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MCP121-475 Datasheet(PDF) 11 Page - Microchip Technology

tên linh kiện MCP121-475
Nội dung chi tiết  Micropower Voltage Detector
tải về  26 Pages
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nhà sản xuất  MICROCHIP [Microchip Technology]
Trang chủ  http://www.microchip.com
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© 2005 Microchip Technology Inc.
DS21889D-page 11
MCP111/112
4.0
APPLICATION INFORMATION
For many of today’s microcontroller applications, care
must be taken to prevent low-power conditions that can
cause many different system problems. The most
common causes are brown-out conditions, where the
system supply drops below the operating level momen-
tarily. The second most common cause is when a slowly
decaying power supply causes the microcontroller to
begin executing instructions without sufficient voltage to
sustain SRAM, thus producing indeterminate results.
Figure 4-1 shows a typical application circuit.
FIGURE 4-1:
Typical Application Circuit.
4.1
V
TRIP Operation
The voltage trip point (V
TRIP) is determined on the falling
edge of V
DD. The actual voltage trip point (VTRIPAC) will
be between the minimum trip point (V
TRIPMIN) and the
maximum trip point (V
TRIPMAX). There is a hysteresis on
this trip point to remove any “jitter” that would occur on
the V
OUT pin when the device VDD is at the trip point.
Figure 4-2 shows the state of the V
OUT
pin as
determined by the V
DD voltage. The VTRIP specification
is for falling V
DD voltages. When the VDD voltage is
rising, the V
OUT pin will not be driven high until VDD is at
V
TRIP + VHYS.
FIGURE 4-2:
VOUT Operation as Determined by the VTRIP and VHYS.
2
MCP11X
VDD
VDD
VDD
VOUT
MCLR
(Reset Input)
VSS
GND
PICmicro®
Microcontroller
3
1
RPU
Note 1: RPU may be required with the MCP111
due to the open-drain output. Resistor
RPU is not required with the MCP112.
0.1
µF
(1)
VDD
VTRIPMAX
VTRIPMIN
VTRIPAC
VTRIPAC
VTRIPAC + VHYSAC
VOUT
1V
< 1 V is outside the
device specifications



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