PM6670 datasheet(37/53 Pages) STMICROELECTRONICS

Part #	PM6670

Description	Complete DDR2/3 memory power supply controller

PDF	53 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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PM6670

Device description

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7.3

S3 and S5 power management pins

According to DDR2/3 memories supply requirements, the PM6670 can manage all S0 to S5

system states by connecting S3-S5 pins to their respective sleep-mode signals in the

notebook's motherboard.

Keeping S3 and S5 high, the S0 (Full-On) state is decoded and the outputs are alive.

In S3 state (S5 = 1, S3 = 0), the PM6670 maintains VDDQ and VTTREF outputs active and

VTT output in high-impedance as needed.

In S4/S5 states (S5 = S3 = 0) all outputs are turned off and, according to DSCG pin voltage,

the proper Soft-End is performed.

Table 11. S3 and S5 Sleep-states decoding

System State

VDDQ

VTTREF

VTT

S0 (Full-On)

OnOnOn

S3 (Suspend-To-RAM)

Off (Hi-Z)

S4/S5 (Suspend-To-Disk)

Off (Discharge)

PM6670 Datasheet(PDF) 37 Page - STMicroelectronics