MEC1322 datasheet(48/456 Pages) MICROCHIP

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MEC1322

DS00001719D-page 48

 2014 - 2015 Microchip Technology Inc.

3.0

POWER, CLOCKS, AND RESETS

3.1

Introduction

The Power, Clocks, and Resets (PCR) chapter identifies all the power supplies, clock sources, and reset inputs to the

chip and defines all the derived power, clock, and reset signals. In addition, this section identifies Power, Clock, and

Reset events that may be used to generate an interrupt event, as well as, the Chip Power Management Features.

3.2

References

No references have been cited for this chapter.

3.3

Interrupts

The Power, Clocks, and Resets logic generates no events

3.4

Power

3.4.1

POWER SOURCES

Table 3-1 lists the power supplies from which the MEC1322 draws current. These current values are defined in Section

37.4, "Power Consumption," on page 395.

Note 3-1

Note on Battery Replacement: Microchip recommends removing all power sources to the device

defined in Table 3-1, "Power Source Definitions" and all external voltage references defined in

Table 3-2, "Voltage Reference Definitions" before removing and replacing the battery. In addition,

upon removing the battery, ground the battery pin before replacing the battery.

APPLICATION NOTE: Battery Circuit Requirement:

• VCC0 must always be present if VCC1 is present.

TABLE 3-1:

POWER SOURCE DEFINITIONS

Power Well

Nominal

Voltage

Description

Source

VCC1

3.3V

Main Battery Pack Supply Power Well.

This is the “Always-on” supply.

Pin Interface

VBAT

(VCC0)

(Note 3-1)

3.0V

System Battery Back-up Power Well.

This is the “coin-cell” battery.

Pin Interface

Note:

The Minimum rise/fall time requirement on VCC1 is 200us.

Note:

The Minimum rise time requirement on VBAT is 100us.

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