MEC1404 Datasheet, PDF (68/572 Pages) Microchip Technology – Keyboard and Embedded Controller Products for Notebook PC

MEC140X/1X
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
• eSPI Controller Specification, 2013 Microchip Technology, DS00000A
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 MEC140X/1X draws current. These current values are defined in
Section 42.3, "Power Consumption," on page 502.
TABLE 3-1: POWER SOURCE DEFINITIONS
Power Well
VTR_33_18
Nominal
Voltage
3.3V or 1.8V
Description
3.3V or 1.8V System Power Supply.
Source
Pin Interface
VTR
3.3V
This supply is used to power the host
interface to this chip. It is either con-
nected to 3.3V VTR power supply or
the eSPI 1.8V power supply.
3.3V System Power Supply.
This is typically connected to the
“Always-on” or “Suspend” supply rails
in system. This supply must be on
prior to the system RSMRST# signal
being deasserted.
Pin Interface
VBAT
(Note 3-1)
3.0V
This supply is used to derive the
chip’s core power and to supply the
3.3V I/O rail.
System Battery Back-up Power Well.
This is the “coin-cell” battery.
Pin Interface
Note:
The minimum rise/fall time requirement on VTR is 200us. The minimum rise/fall time requirement on
VTR_33_18 is 100mV/usec or 18us. VTR_33_18 must turn on at the same time or after the 3.3V VTR sup-
ply is powered.
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
DS00001956D-page 68
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