ISL22346_09 Datasheet, PDF (13/16 Pages) Intersil Corporation – Quad Digitally Controlled Potentiometers

ISL22346
TABLE 4. IDENTIFICATION BYTE FORMAT
Logic values at pins A2, A1, and A0 respectively
1
0
1
0
A2 A1 A0 R/W
(MSB)
(LSB)
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
WRITE
S
T
A _{IDENTIFICATION}
R
BYTE
T
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
13
FN6177.2
September 3, 2009