
RC5060
8
P
Figure 5. Camino System Architectural Block Diagram (Power Paths Only)
5Vmain, 18A
5Vstdby 720mA
12V, 6A
Switch
Switch
Typedet
Linear
Linear
Linear/Switch
Linear
Conversion
Synchronous
Vcore 2V/17.4A
RC1587
RC5058
SO24
Linear
Linear
Linear
PWROK SLP_S3# SLP_S5#
RC5060
SO20
Switch
Switch
3.3V SDRAM @ 4.8A/100mA
2.5V RDRAM @ 2A/144mA
3.3Vdual 2.4A/500mA/500mA PCI
5Vdual 1A/1A/200mA USB
Vtt 1.5V/2A
Vck 2.5V/600mA
Vagp 3.3V/1.5V/2A
Vnb 1.8V/2A
3.3Vmain, 14A
ATX
Application Information
The RC5060 Controller
The RC5060 is a fully compliant ACPI controller IC. Used
with an ATX power supply, it generates a 5V Dual voltage, a
3.3V Dual for PCI, and power for both SDRAM and RAM-
BUS, and has a large array of additional protection functions
integrated in. Used in conjunction with Fairchild’s RC5058,
it provides the complete set of control and power functions
necessary to implement a Camino or Whitney motherboard.
Overview of ACPI
The Advanced Configuration and Power Interface, or ACPI,
is a system for controlling the use of power in a computer. It
enables the computer manufacturer and the computer user to
determine the computer’s power usage dynamically. For
example, when the computer has been unused for a certain
time, the monitor and peripherals could be turned off, and
their states saved to memory. After a longer period, the pro-
cessor could be turned off, and the memory saved to disk. A
peripheral could then re-awaken the entire system on the
occurrence of an event, such as the arrival of a FAX on a
modem.
As shown in Figure 5, the available power inputs to the com-
puter system from the ATX power supply are +5V main, +12V
main, +3.3V main, and +5V standby. “Main” means that
these power outputs are available under full-power operation
of the system, but can be turned off in some of the power-
saving modes. “Standby” means that this power output is
always present.
The most general ACPI system requires four dual outputs:
5V dual, 3.3V dual, 3.3V SDRAM, and 2.5V RAMBUS (or
2.5V dual). “Dual” means that the power can be (but is not
necessarily) present whether the main power supplies are
present or not. To ensure the presence of these outputs, while
not overloading the standby power, they have dual inputs,
from both main power and standby. The presence or absence
of the dual outputs is determined by the control signals to the
RC5060.
ACPI States
As shown in Table 1, there are three ACPI states that are of
primary concern to the system designer, designated S0, S3
and S5. S0 is the full-power state, the state of the computer
when it is being actively used. The other two states are sleep
states, reflecting differing levels of power-down.