STW8019 datasheet(15/55 Pages) STMICROELECTRONICS

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STw8009/STw8019

Functional description

15/55

4.12.1

Operating modes

STw8009/STw8019 can be in the following operating modes.

●

OFF

–

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

–

All values from STw8009/STw8019 registers are lost.

●

Sleep

–

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

–

The suspend signal is active.

–

The DACs are in their minimum power consumption mode.

–

All values from the STw8009/STw8019 registers are lost.

●

Standby

–

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

–

The 27 MHz pixel clock must be activated.

–

The suspend signal is inactive.

–

STw8009/STw8019 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. STw8009/STw8019 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: 1.2 V, 1.8 V, 2.8 /3.3 V.

–

STw8009/STw8019 receives the 27 MHz pixel clock.

–

The suspend signal is inactive.

–

STw8009/STw8019 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. STw8009/STw8019 saves the register values.

–

The 27 MHz pixel clock is distributed in all STw8009/STw8019.

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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