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September 2017

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PI3DPX1202A

Document number: DS40115 Rev.2-1

Intelligent Power Management

The device intelligent signal detection scheme allows portions, or all of the IC, to be disabled for power savings. In DP

mode, if only one or two lanes are active, the other lanes will be automatically powered off. If there is no input video

signal the entire IC will be powered down. If there is no monitor detected, it can also automatically power down the IC.

The power-down mode can also be entered using hard pin ENABLE, or through DPCD register (AUX link training).

Table 4-1: DP Channel Power down State

State POR

State POR

Description

External Pins

Internal Signal

3.3-1.2V active

channel regula-

tor(1)

Active channel

HPD

CAD

_SNK

DPCD CS

decode

ST_POR

Power On Reset

X

X

0

Powered down

Powered down

ST_LPM1

Low Power Mode 1

X

X

0

Powered down

Powered down

ST_LPM2

Low Power Mode 2

X

X

0

Powered down

Powered down

ST_ACT

Active Mode

1

0

1

Active

Active

ST_ACT

Active Mode

1

0

0

Powered down

Powered down

ST_WAIT

Active Wait

1

0

1

Active

Active

ST_WAIT

Active Wait

1

0

0

Powered down

Powered down

ST_POR

Power On Reset

X

1

X

Powered down

Powered down

ST_LPM1

Low Power Mode 1

X

1

X

Powered down

Powered down

ST_LPM2

Low Power Mode 2

X

1

X

Powered down

Powered down

ST_ACT

Active Mode

1

1

1

Active

* Note (1)

ST_WAIT

Active Wait

1

1

1

Active

* Note (1)

Note:

(1) Inactive channel are always powered down.