TWI Scanner I2C address is 1 bit wrong

[StevenW807]

I'm using <TWI Scanner> example on nRF52 DK to find my sensor's address.

According to the sensor datasheet, the sensor's address is 0x21. However, <TWI Scanner> finds the address at 0x20. 

Any idea, please? 

[StevenW807]

Update.

In sdk config, I changed SCL and SDA pins as pin 3 and 4. These 2 pins work well in <twi_master_with_twis_slave> example. Then, I used <TWI scanner> to scan my sensor address. 

It shows "No device was found". 

[StevenW807]

Problem Solved! 

The code doesn't work due to the slave device and time delay issue. The sensor I'm using requires:

1) reset-->send continuous mode command-->read data (I didn't add reset command before)

2) meanwhile, for each read/write command, we must add a time delay (e.g. 5 ms) after the command

Thanks to everyone who helped me before! Cheers