ADS7044: How to control ADS7044

t.suzumura

Prodigy 20 points

Part Number: ADS7044

Please let me confirm the control method of ADS7044.
Is the following understanding of SDO read timing correct?

1. CS = LOW
2. SCLK = HIGH
3. SCLK = LOW
4. SCLK = HIGH
5. SCLK = LOW
6. SCLK = HIGH
7. SDO Read(D11)
8. SCLK = LOW

I look forward to your reply.

over 1 year ago

0 Tom Hendrick over 1 year ago

TI__Guru**** 180751 points

Hi Suzumura-san,

If I follow your description above, you seem to be describing SPI Mode 1 (CPOL=0, CPHA=1). The ADS7044 will work in this mode, the MSB is presented on the 3rd SCLK.

0 t.suzumura over 1 year ago in reply to Tom Hendrick

Prodigy 20 points

Thank you for your reply.

Explaining with this diagram
Is it correct to understand that D11 can be obtained at the third rising edge of SCLK?

www.ti.com/.../ads7044.pdf
8 Page

+1 Tom Hendrick over 1 year ago in reply to t.suzumura

TI__Guru**** 180751 points

The SPI convention is to read on the falling SCLK edge, but yes, the MSB should be valid after the 3rd rising clock edge.

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ADS7044: How to control ADS7044