CAT5261 Ver la hoja de datos (PDF) - ON Semiconductor

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CAT5261

Dual Digital Potentiometer (POT) with 256 Taps and SPI Interface

ON Semiconductor 

CAT5261

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.

SI

0101 00

ID3 ID2 ID1 ID0 A3 A2 A1 A0 I3 I2 I1 I0 R1 R0 P1 P0

Device ID

Internal

Address

Instruction Register Pot/WCR

Opcode Address Address

Figure 6. Two-Byte Instruction Sequence

SI

0 10100

ID3 ID2 ID1 ID0 A3 A2 A1 A0 I3 I2 I1 I0 R1 R0 P1 P0 D7 D6 D5 D4 D3 D2 D1 D0

Device ID

Internal

Address

Instruction

Opcode

Data Pot/WCR

Register Address

Address

WCR[7:0]

or

Data Register D[7:0]

Figure 7. Three-Byte Instruction Sequence

SI

010100

ID3 ID2 ID1 ID0 A3 A2 A1 A0 I3 I2 I1 I0 R1 R0 P1 P0 I I

ID

D

Device ID

Internal

Address

Instruction

NN

Data Pot/WCR C C

NE

CC

E

C

Opcode

Register Address 1 2

n1

n

Address

Figure 8. Increment/Decrement Instruction Sequence

INC/DEC

Command

Issued

SCK

tWRL

SI

RW

Voltage Out

Figure 9. Increment/Decrement Timing Limits

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