ISL22416 Datasheet, PDF (12/14 Pages) Intersil Corporation – Single Digitally Controlled Potentiometer XDCP

ISL22416
CS
SCK
SDI
0 1 0 1 0 0 0 0 0 I3 I2 I1 I0 0 0 R1 R0
0 D6 D5 D4 D3 D2 D1 D0
FIGURE 16. THREE BYTE WRITE SEQUENCE
CS
SCK
SDI
SDO
0 1 0 1 0 0 0 0 0 I3 I2 I1 I0 0 0 R1 R0
DON’T CARE
0 D6 D5 D4 D3 D2 D1 D0
FIGURE 17. THREE BYTE READ SEQUENCE
Examples
A. Writing to the IVR
This sequence will write a new value (77h) to the IVR
(non-volatile):
Set the ACR (Addr 02h) for NV write (40h)
Send the ID byte, Instruction Byte, then the Data byte
010100001100001001000000
(Sent to DI)
Set the IVR (Addr 00h) to 77h
Send the ID byte, Instruction Byte, then the Data byte
010100001100000001110111
(Sent to DI)
B. Reading from the WR
This sequence will read the value from the WR (volatile):
Write to ACR first to access the WR
Send the ID byte, Instruction Byte, then the Data byte
010100001100001011000000
(Sent to DI)
Read the data from WR (Addr 00h)
Send the ID byte, Instruction Byte, then Read the Data byte
0101000010110000xxxxxxxx
(Out on DO)
12
FN6227.2
September 9, 2009