ISL22323 Datasheet, PDF (14/18 Pages) Intersil Corporation – Dual Digitally Controlled Potentiometer XDCP

ISL22323
SCL
SDA
START
DATA
DATA
DATA
STABLE CHANGE STABLE
STOP
FIGURE 16. VALID DATA CHANGES, START AND STOP CONDITIONS
SCL FROM
MASTER
1
SDA OUTPUT FROM
TRANSMITTER
8
9
HIGH IMPEDANCE
SDA OUTPUT FROM
RECEIVER
HIGH IMPEDANCE
START
ACK
FIGURE 17. ACKNOWLEDGE RESPONSE FROM RECEIVER
SIGNALS FROM
THE MASTER
S
WRITE
T
A _{IDENTIFICATION}
R
T
BYTE
ADDRESS
BYTE
S
DATA
T
BYTE
O
P
SIGNAL AT SDA
1 0 1 0 A2 A1 A0 0 0 0 0 0
SIGNALS FROM
THE SLAVE
A
A
A
C
C
C
K
K
K
FIGURE 18. BYTE WRITE SEQUENCE
S
S
SIGNALS T
T
FROM THE A IDENTIFICATION
A IDENTIFICATION
A
MASTER R
T
BYTE WITH
R/W = 0
ADDRESS
BYTE
R _{BYTE WITH}
T
R/W = 1
C
K
SIGNAL AT SDA 1 0 1 0 A2A1 A0 0 0 0 0 0
A
SIGNALS FROM
C
THE SLAVE
K
1 0 1 0 A2 A1 A0 1
A
A
C
C _{FIRST READ}
K
K _{DATA BYTE}
FIGURE 19. READ SEQUENCE
14
A
C
K
S
AT
CO
KP
LAST READ
DATA BYTE
FN6422.1
March 13, 2008