X9268TT24I datasheet(10/24 Pages) INTERSIL

Part #	X9268TT24I

Description	Dual Supply/Low Power/256-Tap/2-Wire Bus

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Manufacturer	INTERSIL [Intersil Corporation]

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10 / 24 page

10

FN8172.1

June 21, 2005

DEVICE DESCRIPTION

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 4. 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 will be 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 potentiometers and one of its

associated registers; 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 X9268; 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 speci-

fied 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 (Figure 5

and

6).

The

Increment/Decrement

command

is

different

from

the

other

commands.

Once

the

command is issued and the X9268 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 RH terminal. Similarly, for each SCL clock

pulse while SDA is LOW, the selected wiper will move

one resistor segment towards the RL terminal.

See Instruction format for more details.

X9268

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