BU9831 Datasheet, PDF (9/13 Pages) Rohm – Non-volatile electronic potentiometer

Memory ICs
(3) Wiper counter data input (WCW)
H
SK
1
4
L
8
24
H
CS
L
H
DIO
1 0 1 00 1 1 0
D8
L
VW
Fig. 13 Wiper counter data input
BU9831 / BU9831F
32
D14
t AW
1) This command is used for direct input of wiper position data. Since the data is 7-bit data sequentially input in the
order of D8, D9, D10, ..., D14, it determines one wiper position among 100 taps. Since no address exists at this
point, the address is ignored. The resistance stabilizes after an interval of tAW from the rise of the 32nd clock.
(4) Data read (DRD)
H
SK
1
4
8
L
H
CS
L
H
DIO
L
(DO)
1 0 1 0 1 0 0 0 A0
HIGH-Z
16
A6
D0
32
t CS
HIGH-Z
D15
Fig. 14 Data read
1) When the data read (DRD) command is received, data is output from the addresses specified by A1 and A0.
2) Output is synchronized to the fall of SK, in order of D0, D1, D2, ..., D15, at the fall of the 16th clock. After 32
clocks have elapsed, the D15 data is retained even if other clocks are input.
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