MCP131X datasheet(21/44 Pages) MICROCHIP

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DS21985A-page 21

MCP131X/2X

MCP1316,

MCP1316M,

MCP1317,

MCP1320

Manual Reset input for a Reset switch.

This input allows a push button switch to be directly con-

nected to the MCP131X/2X MR pin, which can then be

used to force a system Reset. This input filters (ignores)

noise pulses that occur on the MR pin.

L = Switch is depressed (shorted to ground). This forces

the RST/RST pins Active.

H = Switch is open (internal pull-up resistor pulls signal

high). State of the RST/RST pins determined by

other system conditions.

MCP1318,

MCP1318M,

MCP1319,

MCP1319M,

MCP1321,

MCP1322

RST

Push-Pull Reset Output (active-high)

Goes active (High) if one of these conditions occurs:

If VDD falls below the selected Reset voltage

threshold.

If the MR pin is forced low.

If the WDI pin does not detect an edge transition

within the minimum selected time out period.

During power-up.

VDD Falling:

H = VDD < VTRIP

L = VDD > VTRIP

VDD Rising:

H = VDD < VTRIP + VHYS

L = VDD > VTRIP + VHYS

MCP1316,

MCP1316M,

MCP1317,

MCP1318,

MCP1318M,

MCP1320,

MCP1321

WDI

Watchdog Timer Input

The WDT period is specified at the time of device order.

The Standard WDT period is 1.6s typical.

An edge transition on the WDI pin resets the Watchdog

Timer counter (no time out). A Falling Edge is required to

start the WDT Timer.

MCP1319,

MCP1319M,

MCP1322

Manual Reset input for a Reset switch.

This input allows a push button switch to be directly con-

nected to the MCP131X/2X MR pin, which can then be

used to force a system Reset. This input filters (ignores)

noise pulses that occur on the MR pin.

L = Switch is depressed (shorted to ground). This forces

the RST/RST pins Active.

H = Switch is open (internal pull-up resistor pulls signal

high). State of the RST/RST pins determined by

other system conditions.

5All

VDD

—

The positive supply for the device.

TABLE 3-1:

PIN FUNCTION TABLE (CONTINUED)

Pin No.

Device

Symbol

Type

Buffer/

Driver

Type

Function

SOT23-5

Note 1:

Open-Drain output with internal pull-up resistor.

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