ltc2991 not sending back data

I am trying to read data from ltc2991 sensor through i2c. My master sends the slave address 0x90 (write), 0x91 (read) and trying to read data from memory location 0x0B. 

I have received ACKs from the slave, however, it always reads 0x00 for the data. 

Also, my master device is SP605. 

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