Hello,
Our customer has troubled command operation of AD5270. They send the commands by following order and setting.
1) 0x2400
2) 0x1000
3) 0x1C02
4) 0x0400
After sending the commands, they checked the position of the digital rheostat wiper. The position was center.
Are there any problems in the order and/or setting of the commands?
And could you please advise me, why do we need an external pull-up resistor on SDO pin if it is not use?
Best regards,
Akira
Hi Mark.
I got the oscilloscope shots. Please refer followings;
(1) NG case; CH1=SCLK, CH2=SYNC
(1)' NG case (expanding) ; CH1=SCLK, CH2=SYNC
(2) OK case 1; CH1=SCLK, CH2=SYNC
(2)' OK case 1 (expanding); CH1=SCLK, CH2=SYNC
(3) OK case 2 ; CH1=SCLK, CH2=SYNC
(3)' OK case 2 (expanding); CH1=SCLK, CH2=SYNC
According to the customer's evaluation result, the SYNC edge needs to rise before the SCLK edge. Do you have any idea about the cause of these phenomenon? Are there any timing constraint between the rise edge of SYNC and the rise edge of SCLK? Or, is the changing of low to high of SYNC available only SCLK = low case?
>Also, just for clarification, did you try the commands with Reset using the OK case?
When the cusotmer send the command with Reset, the wiper didn't work.
Best regards,
Akira
Hi Mark.
I got the oscilloscope shots. Please refer followings;
(1) NG case; CH1=SCLK, CH2=SYNC
(1)' NG case (expanding) ; CH1=SCLK, CH2=SYNC
(2) OK case 1; CH1=SCLK, CH2=SYNC
(2)' OK case 1 (expanding); CH1=SCLK, CH2=SYNC
(3) OK case 2 ; CH1=SCLK, CH2=SYNC
(3)' OK case 2 (expanding); CH1=SCLK, CH2=SYNC
According to the customer's evaluation result, the SYNC edge needs to rise before the SCLK edge. Do you have any idea about the cause of these phenomenon? Are there any timing constraint between the rise edge of SYNC and the rise edge of SCLK? Or, is the changing of low to high of SYNC available only SCLK = low case?
>Also, just for clarification, did you try the commands with Reset using the OK case?
When the cusotmer send the command with Reset, the wiper didn't work.
Best regards,
Akira
