AS0260CSSC28SUD20 datasheet(51/83 Pages) ONSEMI

51 / 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

Auto-Exposure Mode

This mode enables or disables the auto-exposure function of the AS0260.

The UVC_AE_MODE_CONTROL variable controls the AS0260 auto-exposure algorithm.

When auto-exposure is enabled, the AS0260 will automatically choose the appropriate

frame interval, exposure time and gain to achieve the desired image brightness.

Image brightness is controlled through the UVC_BRIGHTNESS_CONTROL variable.

When auto-exposure is disabled, the frame interval, exposure time and gain can be

manually controlled through the UVC_FRAME_INTERVAL_CONTROL, UVC_EXPO-

SURE_TIME_ABSOLUTE_CONTROL and UVC_GAIN_CONTROL variables.

A valid setting for this control will only have one bit set (bits 0 to 3) - any other combina-

tion of bits will be rejected with EINVAL; the current setting will not be changed.

When the host switches from auto-exposure mode to manual-exposure mode, the SOC

will update the values of UVC_FRAME_INTERVAL_CONTROL, UVC_EXPOSURE_-

TIME_ABSOLUTE_CONTROL and UVC_GAIN_CONTROL to reflect the current settings

(the previous contents of these variables will be lost).

The range of valid values for this control is chosen to map directly to the UVC 1.1 stan-

dard. UVC combines auto- and manual iris control with auto- and manual exposure

control - therefore there is some duplication within the bits supported. The assumption

is that the USB bridge/ISP device will implement auto/manual iris control where

required; this function is not supported by the AS0260.

Auto-Exposure Priority

Controls the operation of the frame-rate control function of the Auto-Exposure algo-

rithm.

The auto-exposure priority control is only active when auto-exposure is enabled (see

Auto-Exposure Mode). When auto-exposure is disabled, changes to auto-exposure

priority will be rejected with EACCES.

The AS0260 auto-exposure algorithm supports two variable frame-rate modes,

controlled via the CAM_AET_AEMODE[CAM_AET_MODE_DISCRETE_FRAME_RATE]

flag. The variable frame-rate mode selected when UVC_AE_PRIORITY_CONTROL is

VARIABLE_FRAME_RATE depends upon the current CAM_AET_AEMODE setting. The

minimum frame-rate is also controlled by the CamControl variables.

The assumption is that the host will configure the variable frame-rate support at device

start-up, via the CamControl interface. If the configuration is such that variable frame-

rate is disabled, attempts to set UVC_AE_PRIORITY_CONTROL to VARIABLE_-

FRAME_RATE will be rejected with ENOSYS.

Variable

Name

Type

Default

R0xCC00

VAR(0x13,0x0000)

UVC_AE_MODE_CONTROL

BITFIELD8 Dependent upon CAM

configuration

Variable

Name

Type

Default

0xCC02

VAR(0x13,0x0002)

UVC_AE_PRIORITY_CONTROL

UINT8

Dependent upon CAM

configuration

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