User guide

MAX6661
Remote Temperature-Controlled Fan-Speed
Regulator with SPI-Compatible Interface
10 ______________________________________________________________________________________
SC
COMMAND BYTE
D7–D0 DATA BYTE
CS
DIN
D15 IS START BIT
ALWAYS HIGH
D15
D8 IS READ/WRITE BIT
HIGH FOR READ
D8
DOUT
THREE-STATE
D7 D6
THREE-STATE
D0
Figure 3. Read Cycle
DIN
D15 IS START BIT
ALWAYS HIGH
CS
DOUT
SC
THREE-STATE
D15
D8 IS READ/WRITE BIT
LOW FOR WRITE
D15–D8 COMMAND BYTE
D8 D7
D7–D0 DATA BYTE
THREE-STATE
D0
Figure 4. Write Cycle
CS
SC
t
TR
t
CSW
SDIN
DOUT
t
CSS
t
CL
t
CH
t
DS
t
DH
t
DO
t
SCS
t
CP
Figure 5. Serial Interface Timing