W191
Signaling from System Core Logic
Start Condition
Stop Condition
Slave Address
(First Byte)
Command Code
(Second Byte)
Byte Count
(Third Byte)
Last Data Byte
(Last Byte)
LSB
0
MSB
1
SDATA
SCLOCK
SDATA
1
2
0
1
0
0
6
1
7
MSB
LSB
MSB
MSB
LSB
1
3
4
5
8
A
1
2
3
4
5
6
7
8
A
1
2
3
4
1
2
3
4
5
6
7
8
A
Acknowledgment Bit
from Clock Device
Signaling by Clock Device
Figure 4. Serial Data Bus Write Sequence
SDATA
t
SPF
t
t
t
LOW
DSU
DHD
t
SP
t
t
t
t
STHD
STHD
HIGH
SPSU
SCLOCK
t
SPSU
t
t
R
F
Figure 5. Serial Data Bus Timing Diagrams
Ordering Information
Ordering Code
W191HI
Package Type
Temperature Range
I = Industrial
16 pin = SSOP (150 mil)
16 pin = SSOP (150 mil)
W191H
Commercial
Rev 1.0,November 20, 2006
Page 8 of 9
SPECTRALINEAR [ SPECTRALINEAR INC ]
