CCS811 sensor not working

[Quinn]

I have two sensor: Si7021 and CCS811 connect to board (nRF51 DK). Si7021 work fine. CCS811 always return NRF_DRV_TWI_EVT_ADDRESS_NACK error. Anyone can give me a help?

[Quinn]

I tested with (0x5A << 1), (0x5B << 1), 0x5A, 0x5B, (0x5A >> 1) and It's still error.