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參數(shù)資料
| 型號： | MCP131X |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Voltage Supervisor |
| 中文描述： | 電壓監(jiān)控 |
| 文件頁數(shù)： | 31/44頁 |
| 文件大?。?/td> | 924K |
| 代理商： | MCP131X |
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2005 Microchip Technology Inc.
DS21985A-page 31
MCP131X/2X
5.0
APPLICATION INFORMATION
This section shows application related information that
may be useful for your particular design requirements.
5.1
Supply Monitor Noise Sensitivity
The MCP131X/2X devices are optimized for fast
response to negative-going changes in V
DD
. Systems
with an inordinate amount of electrical noise on V
DD
(such as systems using relays) may require a 0.01
μ
F
or 0.1
μ
F bypass capacitor to reduce detection sensitiv-
ity. This capacitor should be installed as close to the
MCP131X/2X as possible to keep the capacitor lead
length short.
FIGURE 5-1:
with Bypass Capacitor.
Typical Application Circuit
5.2
Conventional Voltage Monitoring
Figure 5-2 and Figure 5-3 show the MCP131X/2X in
conventional voltage monitoring applications.
FIGURE 5-2:
Battery Voltage Monitor.
FIGURE 5-3:
Power Good Monitor.
5.3
Using in PICmicro
Microcontroller, ICSP
Applications
Figure 5-4 shows the typical application circuit for using
the MCP132X for voltage superviory function when the
PICmicro microcontroller will be programmed via the
In-Circuit Serial Programming (ICSP) feature.
Additional information is available in TB087,
“Using
Voltage Supervisors with PICmicro
Microcontroller
Systems which Implement In-Circuit Serial Program-
ming”
, DS91087.
FIGURE 5-4:
for PICmicro
Microcontroller with the ICSP
Feature.
Typical Application Circuit
MCP131X/2X
WDI
MR
V
DD
RST
RST
V
SS
0.1
μ
F
V
DD
RST
V
SS
BATLOW
MCP131X/2X
+
–
V
DD
RST
V
SS
Power Good
MCP131X/2X
+
–
Pwr
Sply
Note:
This operation can only be done using the
device with the Open-Drain RST pin
(MCP1320, MCP1321 and MCP1322).
Devices that have the internal pull-up
resistor are not recommended due to the
current path of the internal pull-up resistor.
Note:
It is recommended that the current into the
RST pin be current limited by a 1 k
Ω
resistor.
MCP132X
V
DD
V
DD
/V
PP
V
DD
RST
MCLR
Reset input)
(Active-Low)
V
SS
V
SS
PICmicro
Microcontroller
R
PU
0.1
μ
F
1 k
Ω
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