MEC1322 Datasheet, PDF (48/456 Pages) Microchip Technology – Keyboard and Embedded Controller for Notebook PC

MEC1322
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.
TABLE 3-1:
Power Well
VCC1
VBAT
(VCC0)
(Note 3-1)
POWER SOURCE DEFINITIONS
Nominal
Voltage
Description
3.3V
3.0V
Main Battery Pack Supply Power Well.
This is the “Always-on” supply.
System Battery Back-up Power Well.
This is the “coin-cell” battery.
Pin Interface
Pin Interface
Source
Note: The Minimum rise/fall time requirement on VCC1 is 200us.
Note: The Minimum rise time requirement on VBAT is 100us.
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.
DS00001719D-page 48
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