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HV7121B

CMOS IMAGE SENSOR With 8-bit ADC

Hyundai Micro Electronics 

Electronics Industries Co., Ltd.

System IC Division

(12) Reset Level Control Register (Address 30h, default:38h, R/W)

HV7121B

CMOS IMAGE SENSOR

With 8-bit ADC

This register controls reference voltage level for start point of data reading. If the register value is too large or

too small, the vertical Fixed Pattern Noise(FPN) can be occurred. To Get rid of FPN, this register must have a

suitable value. Optimum reset revel can be found using Low reference number registers 57h ~ 58h and High

reference number registers 59h ~ 5ah. If there is some large value in Low reference number registers, the

value of Reset Level control register should be increased. If there is some large value in High reference

number registers, the value of register should be decrease. Optimum reset revel is achieved when value of

Low reference level number registers and value of High reference number registers is minimized.

(13) Color Gain Register

Red Color Gain Register : (Address 31h, default:1Eh, R/W)

Green Color Gain Register : (Address 32h, default:h1Eh, R/W)

Blue Color Gain Register : (Address 33h, default:h1Eh, R/W)

These registers are used to amplify the analog pixel output. If the gain register value is decreased, the

amplification is increased. Therefore under the dark light source condition, the pixel output have to be amplified

by decreasing gain value to get good image. There are three Gain registers to control RGB colors

independently. In the case of monochrome image sensor, use only Green Color Gain Register. Available

program range is 0 ~ 63 but too small value can cause FPN. The register value have to chosen within the range

that doesn’ t cause FPN. Recommended range is 20 ~63. These register can be used for Auto White Balance

control and Auto Exposure control.

(14) Pixel Bias Voltage Register (Address 34h, default:02h, R/W)

This register controls pixel reference level by controlling bias current of pixel output sensing load transistor. It

controls pixel output level itself, compare with that revel register adjust A/D Converter circuit to calibrate

reference level for data reading. Available program range is 0 ~ 7. The larger register value causes the higher

bias current and low pixel output reference level. This register is option for manufacturer. Users may use default

setting and don’ t changed value.

This document is a general product description and is subject to change without notice. Hyundai Electronics does not assume any

responsibility for use of circuits described. NO patent licenses are implied.

DA41990615R_1.0

Division

19

1999 Hyundai System IC

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