AS0260CSSC28SUD20 datasheet(60/83 Pages) ONSEMI

60 / 83 page

AS0260 DS Rev. G Pub. 5/15 EN

©Semiconductor Components Industries, LLC, 2015.

AS0260: 1/6-Inch 1080P High-Definition (HD) System-On-A-Chip (SOC) Digi-

tal Image Sensor

UVC Configuration and Status

The following subsections detail the UVC configuration and status variables. These do

not form part of the UVC standard. They are provided to allow the implementation (or

meaning) of selected UVC controls to be configured.

Manual Exposure Configuration

The UVC_FRAME_INTERVAL_CONTROL variable (frame-interval) allows the host to set

the frame-rate, and the UVC_EXPOSURE_TIME_ABSOLUTE_CONTROL (exposure time)

variable allows the host to directly control the exposure time (both provided auto-expo-

sure mode is disabled). However, in some cases it may be appropriate for the exposure

time to be limited:

• Such that exposure cannot exceed the current frame interval

• Such that image flicker is avoided by constraining exposure to multiples of the power-

line frequency period

If DISABLE_FIXED_FRAME_RATE (bit 0) is clear, any change in exposure time will be

rejected if it exceeds the current value of frame-interval. If DISABLE_FIXED_-

FRAME_RATE is set, the AS0260 will accept any value of exposure time (subject to its

permitted range, and the state of bit 1). Note also that if DISABLE_FIXED_FRAME_RATE

is clear, if frame-interval is reduced to a value below the current exposure time value, the

AS0260 will automatically reduce the exposure time.

If ENABLE_FLICKER_AVOIDANCE (bit 1) is set, any change in exposure time will be

rounded-down to the nearest next multiple of the power-line frequency period. No error

will be reported. If ENABLE_FLICKER_AVOIDANCE is clear, the AS0260 will accept any

value of exposure time (subject to its permitted range).

Note:

The default configuration is to restrict exposure time such that it will not exceed the

frame-interval - this conforms to the UVC 1.1 specification.

Flicker Avoidance Configuration

Configures the AS0260 flicker-avoidance algorithm.

The flicker-avoidance algorithm can operate in two modes:

• Flicker-avoidance: exposure time is restricted to multiples of the flicker period,

regardless of the scene brightness.

• Flicker-avoidance with outdoor override: exposure time is restricted to multiples of

the flicker period, unless the scene brightness is typical for an 'outdoor' scene (where

power line frequency flicker artefacts are not expected). In these brighter scenes, AE

can choose the most appropriate exposure time.

Variable

Name

Type

Default

R0xCC20

VAR(0x13,0x0020)

UVC_MANUAL_EXPOSURE_CONFIG

BITFIELD8

0x0 (fixed frame rate, no flicker avoidance)

Variable

Name

Type

Default

0xCC21

VAR(0x13,0x0021)

UVC_FLICKER_AVOIDANCE_CONFIG

BITFIELD8

Dependent upon CAM configuration

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