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X9241AYPI Datasheet(PDF) 5 Page - Xicor Inc. |
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X9241AYPI Datasheet(HTML) 5 Page - Xicor Inc. |
5 / 18 page X9241A Characteristics subject to change without notice. 5 of 18 REV 1.1.13 12/09/02 www.xicor.com 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 S T A R T 0101 A3 A2 A1 A0 A I3 I2 I1 I0 P1 P0 R1 R0 SCL SDA S T O P C K A C K S T A R T 0 1 0 1 A3A2A1A0 A I3 I2 I1 I0 P1 P0 R1 R0 SCL SDA S T O P CM DW D5 D4 D3 D2 D1 D0 C K A C K A C K S T A R T 0101 A3 A2 A1 A0 I3 I2 I1 I0 P1 P0 R1 R0 SCL SDA S T O P X X I N C 1 I N C 2 I N C n D E C 1 D E C n A C K A C K |
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