ADE7756 pin problem - communication pulled down by the IC

[~E3016~]

ade7756

Hi everyone...

i've a real confusing problem with the ADE7756. whenever i made a communication trough SPI, the DIN (data input to ADE7756) was pulled down by the IC itself, i checked this using the scope, the other pins were OK (SCLK,CS). the logic have to be 1(5V) and 0(0V), but the actual measurement was just 2V - 0V...

i tried use buffer, but the same thing still happen. the DIN from uC is OK now, though.

please help me ...

(i'm using MCS51)

 

[bobcat1]

ade7756 input

Hi

Since the SPI pin are not defined as open drain - I think you probably mixed between DO and DI

Just replace between DI and DO - this is a common mistake

All the best

Bobi

 

[~E3016~]

Re: ADE7756 pin problem

Hi

Since the SPI pin are not defined as open drain - I think you probably mixed between DO and DI

Just replace between DI and DO - this is a common mistake

All the best

Bobi

thx for caring ...

i have observed that both DIN and DOUT has high impedance as an input or output, and the datasheet doesn't explain that the pin is open drain either. i have also tried to use pull up with 10K ohm. and it seems the IC still pulling it down.

 

[bobcat1]

Re: ADE7756 pin problem

Hi

Upload your schematic

All the best

Bobi