X9258_14 Datasheet, PDF(6/19 Page) Intersil Corporation – Quad Digital Controlled Potentiometers

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X9258_14 Datasheet, PDF (6/19 Pages) Intersil Corporation – Quad Digital Controlled Potentiometers

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X9258

The Increment/Decrement command is different from the

other commands. Once the command is issued and the

X9258 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 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.

TABLE 1. INSTRUCTION SET

INSTRUCTION SET

INSTRUCTION

I3 I2 I1 I0 R1 R0 P1 P0

OPERATION

Read Wiper Counter Register 1 0 0 1 0 0 1/0 1/0 Read the contents of the Wiper Counter Register pointed to

by P1 - P0

Write Wiper Counter Register 1 0 1 0 0 0 1/0 1/0 Write new value to the Wiper Counter Register pointed to by

P1 - P0

Read Data Register

1 0 1 1 1/0 1/0 1/0 1/0 Read the contents of the Data Register pointed to by P1 - P0

and R1 - R0

Write Data Register

1 1 0 0 1/0 1/0 1/0 1/0 Write new value to the Data Register pointed to by P1 - P0

and R1 - R0

XFR Data Register to Wiper

Counter Register

1 1 0 1 1/0 1/0 1/0 1/0 Transfer the contents of the Data Register pointed to by

P1 - P0 and R1 - R0 to its associated Wiper Counter Register

XFR Wiper Counter Register to 1 1 1 0 1/0 1/0 1/0 1/0 Transfer the contents of the Wiper Counter Register pointed

Data Register

to by P1 - P0 to the Data Register pointed to by R1 - R0

Global XFR Data Registers to 0 0 0 1 1/0 1/0 0

Wiper Counter Registers

0 Transfer the contents of the Data Registers pointed to by

R1 - R0 of all four potentiometers to their respective Wiper

Counter Registers

Global XFR Wiper Counter

Registers to Data Register

1 0 0 0 1/0 1/0 0

0 Transfer the contents of both Wiper Counter Registers to

their respective data Registers pointed to by R1 - R0 of all

four potentiometers

Increment/Decrement Wiper

Counter Register

NOTE:

4. 1/0 = data is one or zero.

00100

0 1/0 1/0 Enable Increment/decrement of the Control Latch pointed to

by P1 - P0

FN8168.6

December 15, 2011

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