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 used eclipse and Jlink to debug. I got Slave Address in data sheet, 0x5A or 0x5B.