MCP1316MT-29LESLASHOT datasheet(36/52 Pages) MICROCHIP

tên linh kiện	MCP1316MT-29LE/OT

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MCP131X/2X

DS21985D-page 36

 2005-2012 Microchip Technology Inc.

5.4

Modifying The Trip Point, VTRIP

Although the MCP131X/2X device has a fixed voltage

trip point (VTRIP), it is sometimes necessary to make

custom adjustments. This can be accomplished by

connecting

an

external

resistor

divider

to

the

MCP131X/2X VDD pin. This causes the VSOURCE

voltage to be at a higher voltage than when the

MCP131X/2X

input

equals

its

VTRIP

voltage

(Figure 5-5).

To maintain detector accuracy, the bleeder current

through the divider should be significantly higher than

the 10 µA maximum operating current required by the

MCP131X/2X. A reasonable value for this bleeder

current is 1 mA (100 times the 10 µA required by the

MCP131X/2X). For example, if VTRIP = 2V and the

desired trip point is 2.5V, the value of R1 + R2 is 2.5 k

(2.5V/1 mA). The value of R1 + R2 can be rounded to

the nearest standard value and plugged into the

equation of Figure 5-5 to calculate values for R1 and

R2. 1% tolerance resistors are recommended.

FIGURE 5-5:

Modify Trip-Point using

External Resistor Divider.

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:

MOSFET Low-Drive

Protection.

5.6

Low-Power Applications

In some low-power applications, the longer the micro-

controller (such as a PIC® MCU) can be in the “Sleep

mode”, the lower the average system current consump-

tion will be.

The WDT feature can be used to “wake-up” the PIC MCU

at a regular interval to service the required tasks before

returning to sleep. This “wake-up” occurs after the PIC

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, VSOURCE must be

greater than (VTRIP)

MCP131X/2X

VDD

RST

VSS

R1

VSOURCE

R2

or RST

V

SOURCE

R

1

R

1

R

2

+

--------------------



V

TRIP



Where:

VSOURCE = Voltage to be monitored

VTRIP = Threshold Voltage setting

VDD

RST

VSS

MCP131X/2X

270



MTP3055EL

VDD

RL

VTRIP

Số phần tương tự - MCP1316MT-29LE/OT

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
Microchip Technology	MCP1316MT-29LE/OT	1Mb / 44P	Voltage Supervisor 2005

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