AR0835HS datasheet(32/70 Pages) ONSEMI

32 / 70 page

AR0835HS_DS Rev. D Pub. 5/15 EN

©Semiconductor Components Industries, LLC, 2015.

AR0835HS: 1/3.2-Inch 8 Mp CMOS Digital Image Sensor

Integration Time for Interlaced HDR Readout

Reading the OTPM

1. Apply power to all the power rails of the sensor (VDD_IO, VAA, VAA_PIX, DVDD_1V2,

DVDD_1V2_PHY, and DVDD_1V8) at their nominal voltage.

2. Set EXTCLK to normal operating frequency.

3. Perform proper reset sequence to the sensor.

4. Set R0x3134=0xCD95 (Timing Configuration)

5. Set R0x304C[15:8] = Record Type (for example, 0x30)

6. Set R0x304C[7:0] = Length of the record which is the number of data registers to be

read back. This could be set to 0 during OTPM auto read if length is unknown.

7. Set R0x3054 = 0x0400

8. Initiate the auto read sequence by setting the otpm_control_auto_read_start bit

(R0x304A[4]) = 1.

9. Poll the otpm_control_auto_rd_end bit (R0x304A[5]) to determine when the sensor is

finished reading the word(s). When this bit becomes 1, the otpm_control_auto_rd_-

success bit (R0x304A[6]) will indicate whether the memory was read successfully or

not.

10. Data can now be read back from the otpm_data registers (R0x3800-R0x39FE).

Image Acquisition Modes

The AR0835HS supports two image acquisition modes:

1. Electronic rolling shutter (ERS) mode.

This is the normal mode of operation. When the AR0835HS is streaming, it generates

frames at a fixed rate, and each frame is integrated (exposed) using the ERS. When the

ERS is in use, timing and control logic within the sensor sequences through the rows

of the array, resetting and then reading each row in turn. In the time interval between

resetting a row and subsequently reading that row, the pixels in the row integrate inci-

dent light. The integration (exposure) time is controlled by varying the time between

row reset and row readout. For each row in a frame, the time between row reset and

row readout is fixed, leading to a uniform integration time across the frame. When the

integration time is changed (by using the two-wire serial interface to change register

settings), the timing and control logic controls the transition from old to new integra-

tion time in such a way that the stream of output frames from the AR0835HS switches

cleanly from the old integration time to the new while only generating frames with

uniform integration. See “Changes to Integration Time” on page 24.

2. Global reset release (GRR) mode.

This mode can be used to acquire a single image at the current resolution. In this

mode, the end point of the pixel integration time is controlled by an external electro-

mechanical shutter, and the AR0835HS provides control signals to interface to that

shutter. The operation of this mode is described in detail in “Global Reset Release

(GRR)” on page 46.

The benefit for the use of an external electromechanical shutter is that it eliminates the

visual artifacts associated with ERS operation. Visual artifacts arise in ERS operation,

particularly at low frame rates, because an ERS image effectively integrates each row of

the pixel array at a different point in time.

Window Control

The sequencing of the pixel array is controlled by the x_addr_start, y_addr_start, x_ad-

dr_end, and y_addr_end registers. The output image size is controlled by the x_output_-

size and y_output_size registers.

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