STW8009B27R/LF View Datasheet(PDF) - STMicroelectronics

Part Name

Description

View to exact match

STW8009B27R/LF

Mobile video DENC

STMicroelectronics 

STw8009/STw8019

Functional description

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

No Power supply applied

Registers values lost

OFF

All supplies are applied but STw8009

suspend is asserted

Register values lost

DAC in low power mode

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after the 1.2V, 1.8V

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Suspend = « 1 »

Sleep

Suspend = « 0 »

STw8009 looses all its

registers and configuration

when entering Sleep mode

Standby

Active

Normal operation

All functions available

DACs dynamically used on demand

By Sw

No need to reset or

reconfigure DENC

in either direction

Registers maintained

Power consumption reduced

DENC clock gated

DACs in low power

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).

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