MEC1404 Datasheet, PDF (448/572 Pages) Microchip Technology – Keyboard and Embedded Controller Products for Notebook PC

MEC140X/1X
36.7.1 POWER DOMAINS
Name
Description
VTR
VBAT
The main power well used when the VBAT RAM is accessed by the EC.
The power well used to retain memory state while the main power rail
is unpowered.
36.7.2 CLOCK INPUTS
No special clocks are required for this block.
36.7.3 RESETS
Name
Description
VBAT_POR
This signal resets all the registers and logic in this block to their default
state.
36.8 Interrupts
This block does not generate any interrupts.
36.9 Low Power Modes
The VBAT-Powered RAM automatically enters a low power mode whenever it is not being accessed by the EC. There
is no chip-level Sleep Enable input.
36.10 Description
FIGURE 36-2:
VBAT RAM BLOCK DIAGRAM
EC Interface
This interface is
only operational
when main
power is
present
VBAT Powered RAM
The VBAT Powered RAM provides a 64 Byte Random Accessed Memory that is operational while VTR is powered, and
will retain its values powered by VBAT while VTR is unpowered. The RAM is organized as a 16 words x 32-bit wide for
a total of 64 bytes.
DS00001956D-page 448
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