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nRF51422 communicating with SAA1064 via TWI/I2C

Michel

The last few weeks I'm working with the nRF51422 and run in to several TWI/I2C issues. All of them I could solve except an issue with a SAA1064 7segment display driver from NXP.

Depending the device selection the I2C address of the SAA1064 should be 0x70, 0x72,0x74 or 0x76. When communicating non of these address will return an ACK. I'm using sd_twi_hw_master.c.

I do have TWI/I2C running because I can communicate with the MPU-9150 and an other sensor. But it fails on the SAA1064.

Is there maybe a small difference/issue with TWI and I2C?

Does anybody know where to look to solve this issue?

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  • 0

    Thanks for you reply. The test mentioned above didn't work. Only a ACK is received on the address of the MPU-9150. On the addresses where I expect the SAA I get a NACK even not after bitshifting the address.

  • 0 in reply to Michel

    I see that my code-snippet seems to be corrupted, but it seems that you have gotten the "essence" of what I was trying to show.

    I had a look at the datasheet for the display.

    1. Have you checked that the VDD of the nRF-device is > 3.0V to ensure logic high on SDA? If you're using the eval kit, it's 3.3V and not configurable.
    2. Have you scoped the analog lines to see if the signal is clean?

    BR Håkon

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  • 0 in reply to Michel

    I see that my code-snippet seems to be corrupted, but it seems that you have gotten the "essence" of what I was trying to show.

    I had a look at the datasheet for the display.

    1. Have you checked that the VDD of the nRF-device is > 3.0V to ensure logic high on SDA? If you're using the eval kit, it's 3.3V and not configurable.
    2. Have you scoped the analog lines to see if the signal is clean?

    BR Håkon

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