14
9120A–AUTO–01/08
ATA6831/ATA6832 Driver ICs
clarifies the daisy chain method. The n = 3 datawords A, B, and C shall be shifted into
the driver ICs 1, 2 and 3. The initial content of the registers are termed as X to Z. The required
status of the input registers DI is reached after n = 3 shift operations.
Figure 6-3.
Daisy Chain Operation with Microcontroller and Watchdog
V
CC
V
CC
Reset
T
ri
gger
Enable
CS
CLK
DO
DI
INH
ATA6831
ATA6831
ATA6831
Micro-
controller
CS
CLK
DO
DI
CS
CLK
DO
DI
CS
CLK
DO
DI
INH
INH
INH
CS
CLK
DO
DI
ATA6831
U5021M
WATCHDOG
Table 6-2.
Principal Method of Shifting Datawords Through Daisy-chained ICs
I/O Cycle
0
1
2
IC number
1
2
3
1
2
3
1
2
3
DI
A
B
A
C
B
A
DO
Z
Y
X
A
Z
Y
B
A
Z
