STW8009_07 Datasheet, PDF (22/66 Pages) STMicroelectronics – Mobile video DENC

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
A^A P^PO^OR^Rnn ^rr^ee^ss^ee^tt ^oo^cc^cc^uu^rr^ss
after the 1.2V, 1.8V
aaftnedr CthLeK12.72MV & 1.8 V
h(s_haev_aeeveAbNebe2_en3_e4na7p_a)p.pl_pie_lid_ed
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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