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OPT3002: Read from Result register(0x00) value is always 0!!!

Part Number: OPT3002

Hi. Now I'm programming opt3002 with I2c interface.

Reading from registers (result, config, limit, manuf id) is normal.

But the default value which is specified in the document is different from the IC.

(Low limit : 0xc000 (pdf), 0x00(device)

Also when I read from low-limit after setting the value by 0xc000, it responds with 0. 

Anyway, the result value is always 0. There is no problem with the I2C communication line.

(I configured AUTO_FSR, Continous mode)

Do you have any idea or hint?

As far as I know, without configuring the config register opt3002 yield the value, am I right?