MCP131X datasheet(26/44 Pages) MICROCHIP

26 / 44 page

MCP131X/2X

DS21985A-page 26

4.1

Reset Voltage Trip Point (V

TRIP)

Operation

The device’s Reset voltage trip point (V

TRIP) is selected

when the device is ordered. As the voltage on the

device’s VDD pin is above or below this selected trip

point, the output of the Reset pin (RST/RST) will be

forced to either the inactive or active state.

For the voltage trip point, there is a minimum trip voltage

(VTRIPMIN) and a maximum trip voltage (VTRIPMAX). The

voltage that the device “actually” trips at will be referred

to as VTRIP. The trip voltage is specified for the falling of

the device VDD.

There is also a hysteresis (VHYS) on the trip point. This

is so that noise on the device voltage (VDD) does not

cause the Reset pin (RST/RST) to “jitter” (change

between driving an active and inactive).

The Reset pin (RST or RST) will be force active if any

of the following occur:

• The Manual Reset input (MR) goes low

• The Watchdog Timer times out

•VDD goes below the threshold

• During device power up

After the device exits the Reset condition, the delay

circuitry will hold the RST and RST pins active until the

appropriate Reset delay time (tRST) has elapsed.

TABLE 4-1:

RESET PIN STATES

Device

State of RST Pin when:

State of RST (3) Pin when:

Ouput Driver

VDD <

VTRIP

VDD > VTRIP +

VHYS

VDD <

VTRIP

VDD > VTRIP +

VHYS

MCP1316

—

Push-pull

MCP1316M

LH (2)

—

Open-drain (2)

MCP1317

—

Push-pull

MCP1318

Push-pull

MCP1318M

LH (2)

Open-drain (2)

MCP1319

Push-pull

MCP1319M

LH (2)

Open-drain (2)

MCP1320

LH (1)

—

Open-drain (1)

MCP1321

LH (1)

Open-drain (1)

MCP1322

LH (1)

Open-drain (1)

Note 1:

Requires External Pull-up resistor.

Has Internal Pull-up resistor.

The RST pin output is always push-pull.

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