X9259US24Z-2.7 datasheet(8/21 Pages) INTERSIL

Part #	X9259US24Z-2.7

Description	Single Supply/Low Power/256-Tap/2-Wire Bus Quad Digitally-Controlled (XDCP) Potentiometers

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Manufacturer	INTERSIL [Intersil Corporation]

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X9259

8

FN8169.6

December 12, 2014

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Instructions

Four of the nine instructions are three bytes in length. These

instructions are:

• Read Wiper Counter Register – read the current wiper position

of the selected potentiometer.

• Write Wiper Counter Register – change current wiper position

of the selected potentiometer.

• Read Data Register – read the contents of the selected Data

Register.

• Write Data Register – write a new value to the selected Data

Register.

The basic sequence of the three byte instructions is illustrated in

Figure 5. These three-byte instructions exchange data between

the WCR and one of the Data Registers. A transfer from a Data

Register to a WCR is essentially a write to a static RAM, with the

static RAM controlling the wiper position. The response of the

wiper to this action is delayed by tWRL. A transfer from the WCR

(current wiper position), to a Data Register is a write to

nonvolatile memory and takes a minimum of tWR to complete.

The transfer can occur between one of the four potentiometer’s

WCR, and one of its associated registers, DRs; or it may occur

globally, where the transfer occurs between all potentiometers

and one associated register.

Four instructions require a two-byte sequence to complete. These

instructions transfer data between the host and the X9259;

either between the host and one of the data registers or directly

between the host and the Wiper Counter Register. These

instructions are:

• XFR Data Register to Wiper Counter Register – This transfers

the contents of one specified Data Register to the associated

Wiper Counter Register.

• XFR Wiper Counter Register to Data Register – This transfers

the contents of the specified Wiper Counter Register to the

specified associated Data Register.

• Global XFR Data Register to Wiper Counter

Register – This transfers the contents of all specified Data

Registers to the associated Wiper Counter Registers.

• Global XFR Wiper Counter Register to Data

Register – This transfers the contents of all Wiper Counter

Registers to the specified associated Data Registers.

Increment/Decrement Command

The final command is Increment/Decrement (Figures 6 and 7).

The Increment/Decrement command is different from the other

commands. Once the command is issued and the X9259 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 moves one

wiper position towards the RH terminal. Similarly, for each SCL

clock pulse while SDA is LOW, the selected wiper moves one

resistor wiper position towards the RL terminal.

See “Instruction Format” on page 10 for more details.

FIGURE 4. TWO-BYTE INSTRUCTION SEQUENCE

FIGURE 5. THREE-BYTE INSTRUCTION SEQUENCE 2-WIRE INTERFACE

S

T

A

R

T

01

0

1

A2

A0

A

C

K

I2

I1

I0

RB RA P1

A

C

K

SCL

SDA

S

T

O

P

ID3 ID2 ID1 ID0

P0

Device ID

External

Instruction

Opcode

Address

Register

Address

DCP/WCR

Address

A1

A3

I3

I2

I1

I0

RB RA

ID3 ID2 ID1 ID0

Device ID

External

Instruction

Opcode

Address

Register

Address

Pot/WCR

Address

Data for WCR[7:0] or DR[7:0]

S

T

A

R

T

0

101

A2

A1

A0

A

C

K

P1 P0

A

C

K

SCL

SDA

S

T

O

P

A

C

K

D7

D6 D5 D4

D3 D2

D1 D0

A3

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