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Not acknowledge generated by ADT7420

Question asked by littlemingsmw on Jun 17, 2016
Latest reply on Jun 24, 2016 by Lluis

Hi,

 

I am using MSP430FR5949 (master Mode) to control the ADT7420. However, ADT7420 sent back a not acknowledge bit to master after the serial bus address byte was transmitted.

 

I cannot read or write anything to IC ADT7420. The master just repeated to transmit the address byte.

 

the address byte is 0x48 because A0 and A1 connected to ground.

 

This is the testing result.

IMG_20160617_163831.jpg

 

Please help.

 

Thank you.

 

Regards,

Sungming

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