X9428 Xicor, X9428 Datasheet
X9428
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X9428 Summary of contents
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... REV 1.1.5 7/8/03 X9428 DESCRIPTION The X9428 potentiometers (XDCP monolithic CMOS integrated microcircuit. The digitally controlled potentiometer is implemented using 63 resistive elements in a series array. Between each element are tap points connected to the wiper terminal through switches. The position of the wiper on the array is controlled by the user through the 2-wire bus interface ...
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... The Address inputs are used to set the least significant 3 bits of the 8-bit slave address. A match in the slave address serial data stream must be made with the Address input in order to initiate communication with the X9428. A maximum of 8 devices may occupy the 2-wire serial bus. Potentiometer Pins R ...
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... If the command is followed by a data byte the X9428 will respond with a final acknowledge. Array Description The X9428 is comprised of a resistor array. The array contains 63 discrete resistive segments that are connected in series. The physical ends of the array are equivalent to the fixed terminals of a mechanical ...
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... ACK polling can be initiated immediately. This involves issuing the start condition followed by the device slave address. If the X9428 is still busy with the write operation no ACK will be returned. If the X9428 has completed the write operation an ACK will be returned, and the master can then proceed with the next operation ...
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... T The Increment/Decrement command is different from the other commands. Once the command is issued and the X9428 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 ...
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... X9428 Figure 4. Three-Byte Instruction Sequence SCL SDA Figure 5. Increment/Decrement Instruction Sequence SCL SDA Figure 6. Increment/Decrement Timing Limits INC/DEC CMD Issued SCL SDA REV 1.1.5 7/8/ ...
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... X9428 Figure 7. Acknowledge Response from Receiver SCL from Master Data Output from Transmitter Data Output from Receiver START Figure 8. Detailed Potentiometer Block Diagram Serial Data Path From Interface Circuitry Register 0 Register 2 If WCR = 00[H] then WCR = 3F[H] then ...
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... Data Register zero (DR0) upon power- up. The WCR is a volatile register; that is, its contents are lost when the X9428 is powered-down. Although the register is automatically loaded with the value in DR0 upon power-up, it should be noted this may be different from the value present at power-down. ...
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... X9428 Instruction Format Notes: (1) “MACK”/”SACK”: stands for the acknowledge sent by the master/slave. (2) “A3 ~ A0”: stands for the device addresses sent by the master. (3) “X”: indicates that “0” for testing purpose but physically “don’t care” condition. ...
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... X9428 XFR Wiper Counter Register (WCR) to Data Register (DR) S device type device S T identifier addresses Increment/Decrement Wiper Counter Register (WCR) S device type device S T identifier addresses ...
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... X9428-2.7 +2.7 X9428 -5.5 X9428-2.7 -5 pin -140 1.6 ±300 TOTAL 10/10/25 www.xicor.com Device Supply Voltage (V 5V ±10% X9428 X9428-2.7 2.7V to 5.5V Max. Unit Test Conditions ± 25°C, each pot ±6 mA Ω Wiper current = ± 1mA, V 250 Ω Wiper current = ± 1mA, V 100 +5.5 V +5.5 -4 ...
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... X9428 D.C. OPERATING CHARACTERISTICS (Over the recommended operating conditions unless otherwise specified.) Symbol Parameter I V supply current CC1 CC (nonvolatile write supply current CC2 CC (move wiper, write, read current (standby Input leakage current LI I Output leakage current LO V Input HIGH voltage ...
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... X9428 A.C. TEST CONDITIONS I nput pulse levels V Input rise and fall times 10ns Input and output timing level V EQUIVALENT A.C. LOAD CIRCUIT 5V 1533Ω SDA Output 100pF AC TIMING (over recommended operating conditions) Symbol f Clock frequency SCL t Clock cycle time CYC t Clock high time ...
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... X9428 HIGH-VOLTAGE WRITE CYCLE TIMING Symbol t High-voltage write cycle time (store instructions) WR XDCP TIMING Symbol t Wiper response time after the third (last) power supply is stable WRPO t Wiper response time after instruction issued (all load instructions) WRL t Wiper response time from an active SCL/SCK edge (increment/decrement instruction) WRID Note: (8) A device must internally provide a hold time of at least 300ns for the SDA signal in order to bridge the undefi ...
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... X9428 XDCP Timing (for All Load Instructions) SCL SDA XDCP Timing (for Increment/Decrement Instruction) SCL SDA Wiper Register Address Write Protect and Device Address Pins Timing SCL SDA WP A0, A2, A3 REV 1.1.5 7/8/03 LSB t WRL Inc/Dec t (START) (STOP) ... ...
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... X9428 APPLICATIONS INFORMATION Basic Configurations of Electronic Potentiometers V R Three terminal Potentiometer; Variable voltage divider Application Circuits Noninverting Amplifier – (1 Offset Voltage Adjustment 100KΩ – + TL072 10KΩ 10KΩ 10KΩ +12V -12V REV 1 ...
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... X9428 Application Circuits (continued) Attenuator R 1 – All -1/2 ≤ G ≤ +1/2 Inverting Amplifier – – + REV 1.1.5 7/8/ 10kΩ Function Generator frequency ∝ R ...
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... X9428 PACKAGING INFORMATION 0° - 8° See Detail “A” NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS) REV 1.1.5 7/8/03 14-Lead Plastic, TSSOP, Package Type V .025 (.65) BSC .169 (4.3) .177 (4.5) .193 (4.9) .200 (5.1) .0075 (.19) .002 (.05) .0118 (.30) .006 (.15) .010 (.25) .019 (.50) .029 (.75) Detail A (20X) www.xicor.com .252 (6.4) BSC .047 (1.20) Gage Plane Seating Plane ...
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... X9428 PACKAGING INFORMATION 16-Lead Plastic SOIC (300 Mil Body) Package Type S PIN 1 INDEX PIN 1 (4X) 7° 0.050 (1.27) 0.010 (0.25) 0.020 (0.50) 0° – 8° 0.015 (0.40) 0.050 (1.27) NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS) REV 1.1.5 7/8/03 0.014 (0.35) 0.020 (0.51) 0.403 (10.2 ) 0.413 ( 10.5) X 45° 0.0075 (0.19) 0.420" 0.010 (0.25) FOOTPRINT www ...
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... Ordering Information X9428 Device *Note: P package only available as X9428WP16I-2.7 for prototyping. Other resistor values not available in package. LIMITED WARRANTY Devices sold by Xicor, Inc. are covered by the warranty and patent indemnification provisions appearing in its Terms of Sale only. Xicor, Inc. makes no warranty, express, statutory, implied description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. Xicor, Inc. makes no warranty of merchantability or fi ...