AD5262 daisy chain

Yes but what is the answer? Could i bit bang 18 bits and execute daisychain command with ad5262? Thx

Based on Figure 52 in DS, the correct sequence is U2(A0 = 0 or 1) --> U1(A0 = 0 or 1) . Only 18 bits data input from SDI is allowed in one SPI write transaction for AD5262.  Only the 18 MSB bits will be taken and others will be ignored, if more than 18 bits data are passed in one frame. 

Yes, the user can bit-bang 18 bits and execute daisy chain command with AD5262. Instructions mentioned in Table 8 in the datasheet must be followed.

It is noted that all SDOs of AD5262 requires a pull-up resistor instead of only U1 as shown in Figure 52 in the datasheet. This is clearly mentioned in Table 5 or Table 6 in the datasheet.

Thank you very much, so if I use 24 of them, I will have 12 CS pins/query to command as minimum. Thx.

Hello Michelle,

Can you please provide more details on your application requirements, along with circuit details if any?

Figure 52 is shown only for 2 ICs. That does not mean that the daisy chaining is limited to 2 ICs. Daisy chain  option allows the user to have multiple ICs as long as its timing requirements are met.

So, whether the user wishes to use 2 ICs or 24 ICs in daisy chain mode, the number of I/O lines remain the same from an external SPI master point of view.

Please visit the link provided below for more details.

https://www.analog.com/en/analog-dialogue/articles/introduction-to-spi-interface.html

Hello Michelle,

Can you please provide more details on your application requirements, along with circuit details if any?

Figure 52 is shown only for 2 ICs. That does not mean that the daisy chaining is limited to 2 ICs. Daisy chain  option allows the user to have multiple ICs as long as its timing requirements are met.

So, whether the user wishes to use 2 ICs or 24 ICs in daisy chain mode, the number of I/O lines remain the same from an external SPI master point of view.

Please visit the link provided below for more details.

https://www.analog.com/en/analog-dialogue/articles/introduction-to-spi-interface.html