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參數(shù)資料
| 型號： | MCP121 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Micropower Voltage Detector |
| 中文描述： | 微功耗電壓檢測器 |
| 文件頁數(shù)： | 11/26頁 |
| 文件大?。?/td> | 266K |
| 代理商： | MCP121 |
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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
) is determined on the falling
edge of V
DD
. The actual voltage trip point (V
TRIPAC
) will
be between the minimum trip point (V
TRIPMIN
) and the
maximum trip point (V
). There is a hysteresis on
this trip point to remove any “jitter” that would occur on
the V
OUT
pin when the device V
DD
is at the trip point.
Figure 4-2 shows the state of the V
OUT
pin as
determined by the V
voltage. The V
specification
is for falling V
DD
voltages. When the V
DD
voltage is
rising, the V
OUT
pin will not be driven high until V
DD
is at
V
TRIP
+ V
HYS
.
FIGURE 4-2:
V
OUT
Operation as Determined by the V
TRIP
and V
HYS
.
2
MCP11X
V
DD
V
DD
V
DD
V
OUT
MCLR
(Reset Input)
GND
V
SS
PICmicro
Microcontroller
3
1
R
PU
(1)
Note 1:
R
PU
may be required with the MCP111
due to the open-drain output. Resistor
R
PU
is not required with the MCP112.
0.1
μF
V
DD
V
TRIPMAX
V
TRIPMIN
V
TRIPAC
V
TRIPAC
V
TRIPAC
+ V
HYSAC
V
OUT
1V
< 1 V is outside the
device specifications
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