X9251TS24 datasheet(10/25 Pages) XICOR

Part #	X9251TS24

Description	Quad Digitally-Controlled (XDCP) Potentiometer

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Manufacturer	XICOR [Xicor Inc.]

Direct Link	http://www.xicor.com

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X9251

Characteristics subject to change without notice.

10 of 25

REV 1.3.3 2/10/04

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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,

– Read Status – this command returns the contents of

the WIP bit which indicates if the internal write cycle

is in progress.

The basic sequence of the three byte instructions is

illustrated in Figure 3. 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 non-volatile 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. The Read Status Register

instruction is the only unique format (see Figure 5).

Four instructions require a two-byte sequence to

complete. These instructions transfer data between the

host and the X9251; 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 (see

Figures 6 and 7). The Increment/Decrement command

is different from the other commands. Once the

command is issued and the X9251 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

SCK clock pulse (tHIGH) while SI is HIGH, the selected

wiper moves one wiper position towards the RH

terminal. Similarly, for each SCK clock pulse while SI is

LOW, the selected wiper moves one wiper position

towards the RL terminal. A detailed illustration of the

sequence and timing for this operation are shown. See

Instruction format for more details.

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