TC1270ASVRCTR datasheet(16/40 Pages) MICROCHIP

16 / 40 page

TC1270A/70AN/71A

DS22035B-page 16

3.1

Ground Terminal (VSS)

VSS provides the negative reference for the analog

input voltage. Typically, the circuit ground is used.

3.2

Supply Voltage (VDD)

VDD can be used for power supply monitoring or a

voltage level that requires monitoring.

3.3

Reset Output (RST and RST)

There are three types of Reset output pins. These are:

Push-Pull active-low Reset

Push-Pull active-high Reset

Open-Drain active-low Reset, External pull-up

resistor required.

3.3.1

ACTIVE-LOW (RST) - PUSH-PULL

The RST push-pull output remains low while VDD is

below the reset voltage threshold (VTRIP). The time that

the RST pin is held low after the device voltage (VDD)

returns to a high level (> VTRIP) is typically 280 ms.

After the Reset delay timer expires, the RST pin will be

driven to the high state.

3.3.2

ACTIVE-HIGH (RST) - PUSH-PULL

The RST push-pull output remains high while VDD is

below the reset voltage threshold (VTRIP). The time that

the RST pin is held high after the device voltage (VDD)

returns to a high level (> VTRIP) is typically 280 ms.

After the Reset delay timer expires, the RST pin will be

driven to the low state.

3.3.3

ACTIVE-LOW (RST) - OPEN-DRAIN

The RST open-drain output remains low while VDD is

below the reset voltage threshold (VTRIP). The time that

the RST pin is held low after the device voltage (VDD)

returns to a high level (> VTRIP) depends on the Reset

Timeout selected. After the Reset Delay Timer expires,

the RST pin will float.

3.4

Manual Reset Input (MR)

The Manual Reset (MR) input pin allows a push button

switch to easily be connected to the system. When the

push button is depressed, it forces a system Reset.

This pin has circuitry that filters noise that may be

present on the MR signal.

The MR pin is active-low and has an internal pull-up

resistor.

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