ADC121c021 is not giving ACK.

mahdhu kommu1

Dear All,

ADC121c021 is interfaced to F28021 uc .

Problem is Applying the analog voltage(Vin) less than 2v to ADC121c021 is not giving ACK at the starting (after power ON). if i was give more than 2v at the starting(After power ON) it's working fine,after that reduce the i/p analog voltage (Vin)less than 2v also it is working fine.

applied voltage of adc121c021 is 3.3v and program is running 100KHZ and address of ADC is 0x5A.

please give me suggestions to overcome this problem. thanks to all.

over 10 years ago

0 Tom Domanski24 over 10 years ago

TI__Expert 3305 points

Hi there,

Could you, please, capture and attach to your post the scope image of the following signals:

SCL

SDA

VIN

It would be useful if we could compare the successfull and unsuccessfull transaction on the I2C bus.

Sincerely,

tom

0 mahdhu kommu1 over 10 years ago in reply to Tom Domanski24

Intellectual 640 points

thanks tom,

problem is solved some hardware wrong connections. thanks once again tom.

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ADC121c021 is not giving ACK.