Intel Power Measurement Support, Mobile Intel 915GME Express Chipset Voltage Rails Sheet 1

Mobile Intel® 915GME Express Chipset —Theory of Operation

For AC power loss, the system operation is defined by register settings in the Intel ICH6-M. Upon the return of power, a BIOS option, set prior to the power loss, allows the system to either go immediately to the S5 state, or reboot to the Full-On state, no matter what the state was before the power loss. External logic for this functionality is not necessary. If the BIOS remains in the S5 state after AC power loss, only the power button or the RTC alarm can bring the system out of the S5 state. The status of enabled wake events will be lost.

3.7Power Measurement Support

Power measurement resistors are provided on the platform to measure the power of most subsystems. All power measurement resistors have a tolerance of 1%. The value of these power measurement resistors are 2 mΩ by default. Power on a particular subsystem is calculated using the following formula:

P = V 2

R

R is the value of the sense resistor (typically 0.002 Ω)

V is the voltage measured across the sense resistor.

It is recommended that the user use a high precision digital multi-meter tool such as the Agilent* 34401A digital multi-meter. Such a meter has 6½ digits of accuracy and can provide a much greater accuracy in power measurement that a common 3½ digit multimeter.

Table 6 summarizes all the power measurement sense resistors located on the Mobile Intel® 915GME Express Chipset platform. All sense resistors are 0.002 Ω unless otherwise noted.

Table 6. Mobile Intel® 915GME Express Chipset Voltage Rails (Sheet 1 of 4)

	Voltage Groups	Voltage Rail	Reference
			Designator
1.0		+V1	U8A2.6
		NC1-6_R	R8A3.2
1.5		+V1.5	Q3J2.1-3
		+V1.5_VCCAUX	R7V1.1
1.5	Always	+V1.5A	R3J12.2
		+V1.5A_ICH	R7V2.1
1.5	Switched	+V1.5S	Q3Y1.1-3
		+V1.5S_DLVDS	R5U15.1
		+V1.5S_DDRDLL	C5R3.1
		+V1.5S_S_PCIE	C5T7.2
		+V1.5S_3GPLL (0.5Ω)	R6R1.1
		+V1.5S_MPLL	C4T1.1
		+V1.5S_HPLL	C4R7.1
		+V1.5S_DPLLA	C5T12.1
		+V1.5S_DPLLB	C5T9.1
		+V1.5S_HMPLL	R4D1.2

Mobile Intel® 915GME Express Chipset
Development Kit User’s Manual	April 2007
30	Order Number: 317230-001US