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參數(shù)資料
| 型號： | MCP131 |
| 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)： | 12/26頁 |
| 文件大小： | 266K |
| 代理商： | MCP131 |
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MCP111/112
DS21889D-page 12
2005 Microchip Technology Inc.
4.2
Negative Going V
DD
Transients
The minimum pulse width (time) required to cause a
reset may be an important criteria in the implementa-
tion of a Power-on Reset (POR) circuit. This time is
referred to as transient duration, defined as the amount
of time needed for these supervisory devices to
respond to a drop in V
DD
. The transient duration time is
dependant on the magnitude of V
TRIP
– V
DD
. Generally
speaking, the transient duration decreases with
increases in V
TRIP
– V
DD
.
Figure 4-3 shows a typical transient duration vs. reset
comparator overdrive for which the MCP111/112 will
not generate a reset pulse. It shows that the farther
below the trip point the transient pulse goes, the
duration of the pulse required to cause a reset gets
shorter. Figure 2-18 shows the transient response
characteristics for the MCP111/112.
A 0.1 μF bypass capacitor, mounted as close as
possible to the V
DD
pin, provides additional transient
immunity (refer to Figure 4-1).
FIGURE 4-3:
Transient Duration Waveform.
Example of Typical
4.3
Effect of Temperature on Time-out
Period (t
RPU
)
The time-out period (t
RPU
) determines how long the
device remains in the reset condition. This is affected
by both V
DD
and temperature. The graph shown in
Figures 2-22, 2-23 and 2-24 show the typical response
for different V
DD
values and temperatures.
4.4
Using in PICmicro
Microcontroller ICSP
Applications (MCP111 only)
Figure 4-4 shows the typical application circuit for using
the MCP111 for voltage supervisory function when the
PICmicro microcontroller will be programmed via the
In-Circuit
Serial
Programming
feature. Additional information is available in TB087,
“Using Voltage Supervisors with PICmicro
Microcon-
troller Systems which Implement In-Circuit Serial
Programming”
, DS91087.
(ICSP)
FIGURE 4-4:
for PICmicro
Microcontroller with the ICSP
feature.
Typical Application Circuit
Time (μs)
0V
S
5V
V
TRIP(MIN)
- V
DD
t
TRANS
V
TRIP(MAX)
V
TRIP(MIN)
Note:
It is recommended that the current into the
RST pin be current limited by a 1 k
Ω
resistor.
V
DD
/V
PP
V
DD
MCLR
(reset input)
(Active-Low)
V
SS
PICmicro
MCU
R
PU
0.1 μF
1 k
Ω
MCP111
V
DD
RST
V
SS
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| MCP131-195E/LB | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Micropower Voltage Supervisors |
| MCP131-195E/TO | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Micropower Voltage Supervisors |
| MCP131-195E/TT | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Micropower Voltage Supervisors |
| MCP131-195I/LB | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Micropower Voltage Supervisors |
| MCP131-195I/TO | 功能描述:監(jiān)控電路 Open Drain Low RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
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