M64283FP View Datasheet(PDF) - MITSUBISHI ELECTRIC

Part Name

Description

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M64283FP

Image Sensor (Artificial Retina Chip)

MITSUBISHI ELECTRIC  

Semiconductor Technical Data

MITSUBISHI

Mitsubishi Integrated Circuit <Linear IC>

M64283FP

Image Sensor (Artificial Retina Chip)

12.5.3. Black Level Calibration Register - Z (2 bits)

The black level calibration enabled by the Z register achieves the effect equivalent to the automatic black

level calibration. However, the calibration bias voltage is the saturation voltage Vsat at the minimum

exposure time of the positive image mode. Therefore, the black level is slightly shifted when the exposure

time or image capture mode has changed. Nothing can be set when the AZ register is "H" and when the

automatic black level control is being executed.

Parameter

Z1

Z0

0

0

1

0

0

1

Zero point calibration

No adjustment

Positive image reading calibration

Negative image reading calibration

12.5.4. Automatic Black Level Calibration Register - CL (Clamp Circuit)

As shown in Figure 6, the black level of the output voltage VOUT in the dark state does not equal to the

Vref value, even after automatic black level calibration. This is caused by offset voltage of an output

amplifier, non-uniformity in the internal arithmetic circuit, etc. A value of Voffset varies depending on an

image capture mode and setting of amplifier gain. However, by using the circuit shown in Figure 8, the

offset value Voffset of black level can be kept to a certain fixed value. The automatic black level

calibration using the clamp circuit is enabled at every image capture mode (except the random access

projection output) and it works when the CL register is "L" (initial value of CL: L). To activate the clamp

circuit, use both SH register (sample hold circuit) and OB register (black level output) by setting "L"

simultaneously.

15/35

Specifications and information in this document are subject to change without notice.

Ver. 2. 2. 3

07/22/1998

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