X9241AMPI datasheet(5/18 Pages) XICOR

5 / 18 page

X9241A

Characteristics subject to change without notice.

5 of 18

REV 1.1.13 12/09/02

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The Increment/Decrement command is different from

the other commands. Once the command is issued and

the X9241A has responded with an acknowledge, the

master can clock the selected wiper up and/or down in

one segment steps; thereby, providing a ﬁne tuning

capability to the host. For each SCL clock pulse (tHIGH)

while SDA is HIGH, the selected wiper will move one

resistor segment towards the VH/RH terminal. Similarly,

for each SCL clock pulse while SDA is LOW, the

selected wiper will move one resistor segment towards

the VL/RL terminal. A detailed illustration of the

sequence and timing for this operation are shown in

Figures 5 and 6 respectively.

Figure 3. Two-Byte Instruction Sequence

Figure 4. Three-Byte Instruction Sequence

Figure 5. Increment/Decrement Instruction Sequence

0101

P1 P0

R1 R0

SCL

SDA

A3A2A1A0 A

I1 I0

P1 P0 R1 R0

SCL

SDA

CM DW D5 D4 D3 D2

D1 D0

0101

A3 A2 A1 A0

P1 P0 R1 R0

SCL

SDA

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