AS0260CSSC28SUD20 datasheet(55/83 Pages) ONSEMI

55 / 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

In all cases, the contrast value represents the gradient of the contrast adjustment curve,

measured at the target brightness point (as controlled by UVC_BRIGHTNESS_CON-

TROL). The AS0260 supports a range of gradients from 0.5 to 2.0; UVC represents this as

a contrast range from 16 (0.5) to 64 (2.0). It shows the range of contrasts that can be

selected. Note the contrast gradient is measured at the inflection point in the curves -

this inflection point is also dependent upon the brightness-metric.

Note that the AS0260 may not support every code within the allowed UVC contrast

range; the AS0260 will round to the nearest code.

Note that the automatic contrast curve calculation as supported by the CAM Control

interface can be disabled. In this event, attempts to change the UVC contrast will be

rejected with EACCES.

The AS0260 does not maintain coherency between UVC_CONTRAST_CONTROL and the

CAM Control variable equivalents.

Gain

The gain control determines the amount of gain applied by the sensor and AS0260 when

auto-exposure mode is disabled. If auto-exposure is enabled, any changes will be

rejected with EBUSY.

UVC_GAIN_CONTROL will not reflect the current gain applied when auto-exposure

mode is enabled. When auto-exposure is disabled with UVC_AUTO_EXPOSURE_MODE,

this variable will reflect the active gain at that time.

The permitted range of gains is dependent upon the current CAM Control sensor config-

uration. Attempts to set a gain outside this range will be accepted, but clamped to the

current minimum or maximum. UVC_RESULT_STATUS will be set to ERANGE to indi-

cate a clamp has occurred.

Power Line Frequency Control

The power line frequency control specifies the local power line frequency. This allows

the auto-exposure algorithm to limit exposure time to multiples of this frequency, in

order to avoid image flicker.

Note the AS0260 does not support the UVC 'Disabled' setting - flicker avoidance cannot

be disabled for all lighting levels. However, this value will not be rejected in order to

conform to the UVC 1.1 standard. The AS0260 will continue using the last-set value, and

the variable will continue to read-back the last-set value.

Note that the UVC_FLICKER_AVOIDANCE_CONFIG configuration variable allows the

host to enable an 'outdoor' mode, which permits exposure times that are less than the

flicker frequency.

Variable

Name

Type

Default

R0xCC0E

VAR(0x13,0x000E)

UVC_GAIN_CONTROL

UINT16

UFIXED

Dependent on gain applied when AE mode is disabled.

Variable

Name

Type

Default

R0xCC03

VAR(0x13,0x0003)

UVC_POWER_LINE_FREQUENCY_CONTRO

UINT8 Dependent upon CAM

configuration

AS0260CSSC28SUD20 数据表(PDF) 55 Page - ON Semiconductor

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