STW8019 datasheet(21/66 Pages) STMICROELECTRONICS

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Functional description

STw8009/STw8019

20/65

4.13.1

Operating modes

STw80x9 can be in the following operating modes.

●

OFF

–

1.2V/1.4V, 1.8V/2.8V, 2.8V/3.3V are not present.

–

All values from STw80x9 registers are lost.

●

Sleep

–

1.2V/1.4V, 1.8V/2.8V, 2.8V/3.3V are present.

–

The suspend signal is active.

–

The DACs are in their minimum power consumption mode.

–

All values from the STw80x9 registers are lost.

–

The 27 MHz pixel clock must be activated

●

Standby

–

All power supplies are present: 1.2V/1.4V, 1.8V/2.8V, 2.8V/3.3V.

–

The 27 MHz pixel clock must be activated.

–

The suspend signal is inactive.

–

STw80x9 is set in standby mode by programming the Control and power

Management Unit registers (Reg 128 to 132) through the 2 wire serial MPU

interface. STw80x9 saves the register values.

–

The other registers (Reg 00 to 109) are not accessible in this mode.

–

The DACs are in their minimum power consumption mode.

–

This mode is a low power state that enables a fast switching to active mode.

●

Active

–

All power supplies are present: 1.2V/1.4V, 1.8V/2.8V, 2.8V/3.3V.

–

STw80x9 receives the 27 MHz pixel clock.

–

The suspend signal is inactive.

–

STw80x9 is placed in active mode by programming the control and power

management unit registers (Reg 128 to 132), through the 2 wire serial MPU

interface. STw80x9 saves the register values.

–

The 27 MHz pixel clock is distributed in all STw80x9.

The DACs are supplied by the 2.8 /3.3 V and can be individually activated or deactivated.

For example only one DAC in CVBS output and both DACs in Y/C output.

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