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CAT5261WI-50-T1 Datasheet(PDF) 10 Page - ON Semiconductor |
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CAT5261WI-50-T1 Datasheet(HTML) 10 Page - ON Semiconductor |
10 / 14 page CAT5261 http://onsemi.com 10 Increment/Decrement Command The final command is Increment/Decrement (Figures 8 and 9). The Increment/Decrement command is different from the other commands. Once the command is issued 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 SCK clock pulse (tHIGH) while SI is HIGH, the selected wiper will move one resistor segment towards the RH terminal. Similarly, for each SCK clock pulse while SI is LOW, the selected wiper will move one resistor segment towards the RL terminal. See Instructions format for more detail. Figure 6. Two-Byte Instruction Sequence 01 0 1 A2 A0 I2 I1 I0 R1 R0 P1 SI ID3 ID2 ID1 ID0 P0 Device ID Internal Instruction Opcode Address Register Address Pot/WCR Address A1 A3 I3 00 Figure 7. Three-Byte Instruction Sequence I3 I2 I1 I0 R1 R0 ID3 ID2 ID1 ID0 Device ID Internal Instruction Opcode Address Data Register Address Pot/WCR Address WCR[7:0] or Data Register D[7:0] 0 101 00 A2 A1 A0 P1 P0 SI D7 D6 D5 D4 D3 D2 D1 D0 A3 Figure 8. Increment/Decrement Instruction Sequence I3 I2 I1 I0 ID3 ID2 ID1 ID0 Device ID Internal Instruction Opcode Address Data Register Address Pot/WCR Address 010100 A2 A1 A0 R0 P1 P0 SI I N C 1 I N C 2 I N C n D E C 1 D E C n R1 A3 Figure 9. Increment/Decrement Timing Limits SCK SI INC/DEC Command Issued Voltage Out tWRL RW |
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