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LDC1312-Q1: Getting Device ID or manufacturer ID

Part Number: LDC1312-Q1

I was trying to get device ID using address 7F and also manufacturer ID 7E

I send over I2C:

1.byte   2.byte 3.Byte  4.byte 5.byte

0x54     0x7F    0x55    0xff     0xff

I getting ack but I can not get 4.byte and 5byte. (I am receiving 0xff)

Pin:  ADDR PİN: low, SD pin: low

What is the issue please help.??