STV0974 Datasheet, PDF (34/69 Pages) STMicroelectronics – Mobile Imaging DSP

STV0974
Functional description
4.9 Camera control unit
4.9.1
Features
● User mode transition
● I²C register map including high-level registers and low-level registers dedicated to scaler
control
4.9.2 Description
Figure 21: State machine user mode transitions
Power down
VDD
Reset
PDN
Boot
1
Sleep
Sleep
Live
Idle Sleep
1
Flash
Idle
Live
Idle
Viewfinder Idle
Flash
Capture
Sleep
Idle
Capture
Capture
Sleep
PDN: Power Down pin
Viewfinder
Live
Viewfinder
Viewfinder
Capture
i. the “1” transition is automatic
ii. Flash mode requires a firmware patch. Contact ST support.
iii. Flash mode is not available with the microprocessor interface
Modes
Power down ●Supply is internally cut.
Reset. Transitional state
Boot ●
Sleep mode This mode ensures that the coprocessor consumes the lowest possible power and I²C
control is possible. Patching should occur in sleep mode followed by setting the system clock
parameters.
Idle Mode The clock coming from the sensor is active and I²C control is possible.
Viewfinder Mode The viewfinder mode can be used to display dithered images on low color depth
local LCD displays. The programmable gamma allows for a wide range of displays. Different image
sizes and data formats can be chosen.
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