AnsweredAssumed Answered

ad995i no output frequency

Question asked by anurag250891 on Mar 10, 2018
Latest reply on Apr 2, 2018 by mcee

Hello everyone,


I am interfacing STM32F103C8T6 with AD9951 with SPI. I have verified SPI pins and output its coming properly including IOUPDATE. In our circuit board we are using external crystal of 40 MHz. 

Actually I dont see any sync clock output may be that could be only reason for not getting programmed. 

pinMode (CS_pin,OUTPUT);
pinMode (IO_Updatepin,OUTPUT);
pinMode (Reset_pin,OUTPUT);
pinMode (IOSync_pin, OUTPUT);
pinMode (OSK_pin,OUTPUT);

digitalWrite (Reset_pin, LOW);
digitalWrite (Reset_pin, HIGH);
digitalWrite (OSK_pin, LOW);
digitalWrite(IOSync_pin, LOW);
digitalWrite (CLKMODESEL_pin, LOW);


This pins I am using in my code. Also Reset pin remains continuously high I checked iit in oscilloscope. Being new to the trouble shooting not able to find the problem and solution for it. Please let me know the solution.