參數(shù)資料
型號(hào)： MCP1316MT
廠商： Microchip Technology Inc.
英文描述： Voltage Supervisor
中文描述： 電壓監(jiān)控
文件頁(yè)數(shù)： 32/44頁(yè)
文件大?。?/td> 924K
代理商： MCP1316MT
MCP131X/2X
DS21985A-page 32
2005 Microchip Technology Inc.
5.4
Modifying The Trip Point, V
TRIP
Although the MCP131X/2X device has a fixed voltage
trip point (V
TRIP
), it is sometimes necessary to make
custom adjustments. This can be accomplished by
connecting an external resistor divider to the
MCP131X/2X V
DD
pin. This causes the V
SOURCE
volt-
age to be at a higher voltage than when the
MCP131X/2X
input
equals
(Figure 5-5).
it’s
V
TRIP
voltage
To maintain detector accuracy, the bleeder current
through the divider should be significantly higher than
the 10
μ
A maximum operating current required by the
MCP131X/2X. A reasonable value for this bleeder
current is 1 mA (100 times the 10
μ
A required by the
MCP131X/2X). For example, if V
TRIP
= 2V and the
desired trip point is 2.5V, the value of R
1
+ R
2
is 2.5 k
Ω
(2.5V/1 mA). The value of R
1
+ R
2
can be rounded to
the nearest standard value and plugged into the equa-
tion of Figure 5-5 to calculate values for R
1
and R
2
. 1%
tolerance resistors are recommended.
FIGURE 5-5:
External Resistor Divider.
Modify Trip-Point using
5.5
MOSFET Low-Drive Protection
Low operating power and small physical size make the
MCP131X/2X series ideal for many voltage detector
applications. Figure 5-6 shows a low-voltage gate drive
protection circuit that prevents overheating of the
logic-level MOSFET due to insufficient gate voltage.
When the input signal is below the threshold of the
MCP131X/2X, its output grounds the gate of the
MOSFET.
FIGURE 5-6:
Protection.
MOSFET Low-Drive
5.6
Low-Power Applications
In some low-power applications, the longer that the
microcontroller (such as a PICmicro MCU) can be in
the “Sleep mode”, the lower the average system cur-
rent consumption will be.
The WDT feature can be used to “wake-up” the PICmicro
MCU at a regular interval to service the required tasks
before returning to sleep. This “wake-up” occurs after the
PICmicro MCU detects a MCLR reset during Sleep mode
(for mid-range family; POR = ‘
1
’, BOR = ‘
1
’, TO = ‘
1
’ and
PD = ‘
1
’).
Note:
In this example, V
SOURCE
must be
greater than (V
TRIP
)
MCP131X/2X
V
DD
RST
or RST
V
SS
R
1
V
SOURCE
R
2
VSOURCE
+
R1
R2
-----R1
×
VTRIP
=
Where:
V
SOURCE
V
TRIP
=
=
Voltage to be monitored
Threshold Voltage setting
V
DD
RST
V
SS
MCP131X/2X
270
Ω
MTP3055EL
V
DD
R
L
V
TRIP
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