STW8009 datasheet(22/66 Pages) STMICROELECTRONICS

22 / 66 page

STw8009/STw8019

Functional description

21/65

4.13.2

Mode transition diagram

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

modes and the actions.

Figure 17.

Mode transition diagram

Transitions to OFF mode

The possible transitions are indicated in

Figure 17: Mode transition diagram10 in dotted

lines. No internal data needs to be saved and the STw80x9 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.

The host sends the order for the STw80x9 to switch from Sleep to Active mode by releasing

Suspend ball. The device then generates a reset sequence to the DENC part.

Transition from Active mode to Sleep mode

In Sleep mode, DENC is not powered on. When Suspend signal changes from « 0 » to

« 1 », the device goes from Active to Sleep mode and an internal Reset signal is generated

by the Control Power Unit management to the DENC part. This signal has a 6 pixclk

duration (pixclk = 27 MHz).

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 »

A PORn reset occurs

after the 1.2V, 1.8V

and CLK27M

have been applied

(see AN2347).

STW8009 Datasheet(PDF) 22 Page - STMicroelectronics

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