Please show me how to use daisy chain of AD5262.
In data sheet, the discription is only AD5260 single digi-pot.
I think a procedure for writing is
Is this correct ?
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.
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.
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