VX6854LC datasheet(97/114 Pages) STMICROELECTRONICS

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VX6854LC

NVM contents

102

NVM contents

The sensor has the following contents in the NVM:

•

revision and traceability data

•

defect data (used on-chip, described in Section 11.2)

•

lens shading 4 channel radial corrector data (used on-chip, described in Section 11.3)

•

sensitivity data (to be used by the host)

12.1

Sensitivity data

This data is not used by the sensor but can be used by the host to calibrate the AWB

system.

The sensitivity data is measured at FMT for each device for one color temperature D65

(Fluorescent Phillips Graphica Pro 965). Each of the four color channel values are recorded.

The 10-bit average of the central 10% of the image (10% of image width, 10% of image

height) is recorded, the pedestal is included in the value. The on board lens shading

correction is disabled. The analog gain is set to x1.

12.2

NVM map

The sensor must be in software standby to read the NVM.

In order to read the NVM the following registers must be programmed.

0x3E04 = 1 - Power-up the NVM

0x3640 = 0 - Access NVM register space

The registers should be reset after reading the NVM to the following:

0x3E04 = 0 - Power-down the NVM

0x3640 = 1 - Disable access to NVM register space

Table 68. NVM map

Index

Data

transfer

page &

page

value

Bit number

Comments

7654

3210

0xFC00

0,0

0x00

Not used

0xFC01

0,1

0x00

0xFC02

0,2

0x00

0xFC03

0,3

0x00

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