Table of Contents Section 1 – New and Featured Products
Table of Contents Section 1 – New and Featured Products
Table of Contents Section 1 – New and Featured Products
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Signal Conditioning/Calibration <strong>and</strong> Control <strong>Products</strong><br />
X93256 Digitally Controlled Potentiometer (XDCP )<br />
Product Highlights<br />
• Single Supply<br />
• 32 Tap<br />
• Low Power<br />
• Up/Down Interface<br />
• 3-terminal Potentiometer<br />
Key Features<br />
• Dual solid-state potentiometers<br />
• 32 wiper tap points per potentiometer<br />
— Wiper position stored in non-volatile memory<br />
<strong>and</strong> recalled on power-up<br />
• 31 resistive elements per potentiometer<br />
— Temperature compensated<br />
— Terminal voltage, 0 to V CC<br />
• Low power CMOS<br />
• Endurance 100,000 data changes per bit<br />
• 14-lead TSSOP<br />
Benefits<br />
• Digital Programmability<br />
• Set <strong>and</strong> Forget Calibration<br />
• Reliability<br />
• Dynamic Controls<br />
• Non-volatile storage <strong>and</strong> recall <strong>of</strong> wiper position<br />
• Power On Recall Circuits<br />
Description<br />
The Xicor X93256 is a dual digitally controlled potentiometer<br />
(XDCP). The device consists <strong>of</strong> two resistor arrays, wiper switches,<br />
a control section, <strong>and</strong> non-volatile memory. The wiper positions<br />
are controlled by individual Up/Down interfaces.<br />
A potentiometer is implemented by a resistor array composed<br />
<strong>of</strong> 31 resistive elements <strong>and</strong> a wiper switching network. The<br />
position <strong>of</strong> each wiper element is controlled by a set <strong>of</strong> independent<br />
CS, U/D, <strong>and</strong> INC inputs. The position <strong>of</strong> the wiper can<br />
be stored in non-volatile memory <strong>and</strong> then be recalled upon a<br />
subsequent power-up operation.<br />
Each potentiometer is connected as a three-terminal variable<br />
resistor <strong>and</strong> can be used in a wide variety <strong>of</strong> applications<br />
including:<br />
• Bias <strong>and</strong> Gain Control<br />
• LCD Contrast Adjustment<br />
Pin Configuration<br />
TSSOP<br />
R W1<br />
R L1<br />
CS 1<br />
INC 2<br />
U/D 2<br />
R H2<br />
V SS<br />
1<br />
2<br />
3<br />
4<br />
5<br />
6<br />
7<br />
X93256<br />
14<br />
13<br />
12<br />
11<br />
10<br />
9<br />
8<br />
R H1<br />
U/D 1<br />
INC 1<br />
V CC<br />
CS 2<br />
R L2<br />
R W2<br />
Available: 2nd Half <strong>of</strong> 2004<br />
Block Diagram<br />
V CC (Supply Voltage)<br />
30K<br />
R H1<br />
U/D 1<br />
INC 1<br />
CS 1<br />
5-Bit<br />
Up/Down<br />
Counter<br />
31<br />
30<br />
R H1<br />
R W1<br />
Up/Down<br />
(U/D 1 & U/D 2 )<br />
Increment<br />
(INC 1 & INC 2 )<br />
Device Select<br />
(CS 1 & CS 2 )<br />
Control<br />
<strong>and</strong><br />
Memory<br />
R L1<br />
R W2<br />
5-Bit<br />
Nonvolatile<br />
Memory<br />
Store <strong>and</strong><br />
Control Recall<br />
Circuitry<br />
29<br />
28<br />
One <strong>of</strong><br />
Thirty<br />
Two<br />
Decoder<br />
2<br />
Transfer<br />
Gates<br />
Resistor<br />
Array<br />
R W<br />
R L2<br />
1<br />
V SS<br />
(Ground)<br />
R H2<br />
0<br />
V CC<br />
V SS<br />
R L1<br />
General Description<br />
Detailed Single Potentiometer Description (1 <strong>of</strong> 2 devices)<br />
1<strong>–</strong>42 www.xicor.com
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