STW8019 datasheet(16/55 Pages) STMICROELECTRONICS

16 / 55 page

Functional description

STw8009/STw8019

16/55

4.12.2

Mode transition diagram

The following mode transition diagram shows the main possible transitions between the

modes and the actions.

Figure 12.

Mode transition diagram

Transitions to OFF mode

The possible transitions are indicated in

Figure 12: Mode transition diagram10 in dotted

lines. No internal data needs to be saved and the STw8009/STw8019 can be turned OFF

from any mode. The only restriction is to comply with the power supply rules described here

after.

Transition from OFF mode to Sleep mode then to Active mode

Power up must be done by starting from OFF to Sleep mode and then from Sleep to Active

mode. Sleep to Standby is not possible.

Following the transition from OFF to Sleep mode, STw8009/STw8019 must receive PORn

signal (Power On Reset) to initialize the Control and power Management Unit registers (Reg

128 to 132).

The host sends the order for the STw8009/STw8019 to switch from Sleep to Active mode by

releasing Suspend ball and enabling pixel clock (27 MHz). The device then generates a

reset sequence to the DENC part.

OFF

Sleep

Standby

Active

Registers maintained

Power consumption reduced

DENC clock gated

DACs in low power

Normal operation

All functions available

DACs dynamically used on demand

No Power supply applied

Registers values lost

All supplies are applied but STw8009

suspend is asserted

DAC in low power mode

STw8009 looses all its

registers and configuration

when entering Sleep mode

A PORn reset occurs

after the 1.2 V & 1.8 V

have been applied

No need to reset or

reconfigure DENC

in either direction

Suspend = « 0 »

By Sw

Suspend = « 1 »

OFF

Sleep

Standby

Active

Registers maintained

Power consumption reduced

DENC clock gated

DACs in low power

Normal operation

All functions available

DACs dynamically used on demand

No Power supply applied

Registers values lost

All supplies are applied but STw8009

suspend is asserted

DAC in low power mode

STw8009 looses all its

registers and configuration

when entering Sleep mode

STw8009 looses all its

registers and configuration

when entering Sleep mode

A PORn reset occurs

after the 1.2 V & 1.8 V

have been applied

No need to reset or

reconfigure DENC

in either direction

No need to reset or

reconfigure DENC

in either direction

Suspend = « 0 »

By Sw

Suspend = « 1 »

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