X9410 datasheet(3/21 Pages) XICOR

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X9410

Characteristics subject to change without notice.

3 of 21

REV 1.1 10/6/00

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PIN NAMES

DEVICE DESCRIPTION

The

X9410

highly

integrated

microcircuit

incorporating two resistor arrays and their associated

registers and counters and the serial interface logic

providing direct communication between the host and

the XDCP potentiometers.

Serial Interface

The X9410 supports the SPI interface hardware

conventions. The device is accessed via the SI input

with data clocked in on the rising SCK. CS must be

LOW and the HOLD and WP pins must be HIGH during

the entire operation.

The SO and SI pins can be connected together, since

they have three state outputs. This can help to reduce

system pin count.

Array Description

The X9410 is comprised of two resistor arrays. Each

array contains 63 discrete resistive segments that are

connected in series. The physical ends of each array

are equivalent to the ﬁxed terminals of a mechanical

potentiometer (VH/RH and VL/RL inputs).

At both ends of each array and between each resistor

segment is a CMOS switch connected to the wiper

(VW/RW) output. Within each individual array only one

switch may be turned on at a time.

These switches are controlled by a Wiper Counter

to select, and enable, one of sixty-four switches.

Wiper Counter Register (WCR)

The X9410 contains two Wiper Counter Registers, one

for each XDCP potentiometer. The WCR is equivalent

to a serial-in, parallel-out register/counter with its

outputs decoded to select one of sixty-four switches

along its resistor array. The contents of the WCR can

be altered in four ways: it may be written directly by the

host via the Write Wiper Counter Register instruction

(serial load); it may be written indirectly by transferring

the contents of one of four associated Data Registers

via the XFR Data Register or Global XFR Data

one step at a time by the Increment/ Decrement

instruction. Finally, it is loaded with the contents of its

Data Register zero (DR0) upon power-up.

The Wiper Counter Register is a volatile register; that

is, its contents are lost when the X9410 is powered-

down. Although the register is automatically loaded

with the value in DR0 upon power-up, this may be

different from the value present at power-down.

Data Registers

Each potentiometer has four 6-bit nonvolatile Data

Registers. These can be read or written directly by the

host. Data can also be transferred between any of the

four Data Registers and the associated Wiper Counter

Data Registers is a nonvolatile operation and will take a

maximum of 10ms.

If the application does not require storage of multiple

settings for the potentiometer, the Data Registers can

be used as regular memory locations for system

parameters or user preference data.

Data Register Detail

Symbol

Description

SCK

Serial Clock

SI, SO

Serial Data

A0-A1

Device Address

VH0/RH0–VH1/RH1,

VL0/RL0–VL1/RL1

Potentiometer Pins

(terminal equivalent)

VW0/RW0–VW1/RW1

Potentiometer Pin

(wiper equivalent)

Hardware Write Protection

V+,V-

Analog Supplies

VCC

System Supply Voltage

VSS

System Ground

No Connection

(MSB)

(LSB)

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