MEC1322 Datasheet, PDF (376/456 Pages) Microchip Technology – Keyboard and Embedded Controller for Notebook PC

MEC1322
34.7.1 POWER DOMAINS
TABLE 34-1: POWER SOURCES
Name
Description
VCC1
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.
34.7.2 CLOCK INPUTS
No special clocks are required for this block.
34.7.3 RESETS
TABLE 34-2: RESET SIGNALS
Name
VBAT_POR
Description
This signal resets all the registers and logic in this block to their default
state.
34.8 Interrupts
This block does not generate any interrupts.
34.9 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.
34.10 Description
FIGURE 34-2:
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 VCC1 is powered,
and will retain its values powered by VBAT while VCC1 is unpowered. The RAM is organized as a 16 words x 32-bit
wide for a total of 64 bytes.
DS00001719D-page 376
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