Intel C2518 FH8065501516710 Data Sheet

Intel

®

 Atom™ Processor C2000 Product Family for Microserver

September 2014

Datasheet, Vol. 2 of 3

Order Number: 330061-002US

155

The SoC internal circuitry is powered by three power wells:

• Core  power  well
• SUS  power  well
• RTC  power  well

This power group includes all internal voltage rails and associated power wells that are 

on only when the system is in the system sleep S0 state (system is fully powered-on). 

These voltage rails are turned off when the system transitions to one of the other low-

power system sleep states. See 

 for the ACPI states flow diagram.

This power group includes internal voltage rails and associated power wells that are on 

when the system is in the S0 and S5 states. These voltage rails are turned off when the 

system transitions from S5 to the G3 (mechanically off) state.

Most of the power management signal pins have their drivers/receivers in the SUS 

power well.

This power group includes all internal voltage rails and associated power wells that are 

always on, even when the system is in the G3 (mechanical off) state. This group is 

supplied its 3.3V from the SUS power supply. When the system is in the G3 state, the 

RTC power well is powered from an external battery source, typically a 3.0V lithium-

type coin cell.

If a complete power failure (no AC power and no battery back-up supply) occurs, this 

voltage rail does not provide any power if there is no functioning battery providing its 

power.

In the G3 state (mechanical off), it is permissible for designs to not have an external 

coin-cell battery if the design does not need to preserve information when the system 

power is turned off.