Rainbow Electronics MAX6661 - Manual (Page 10)

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