X9271 Xicor, X9271 Datasheet
X9271
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X9271 Summary of contents
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... Interface and Control REV 1.1.7 2/6/03 S YSTEM X9271 TM DESCRIPTION The X9271 integrates a single digitally controlled potentiometer integrated circuit The digital controlled potentiometer is implemented using 255 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 SPI bus interface ...
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... X9271 DETAILED FUNCTIONAL DIAGRAM V CC HOLD CS SCK INTERFACE SO AND CONTROL SI CIRCUITRY CIRCUIT LEVEL APPLICATIONS • Vary the gain of a voltage amplifier • Provide programmable dc reference voltages for comparators and detectors • Control the volume in audio circuits • Trim out the offset voltage error in a voltage amplifier circuit • ...
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... A4 3 B2, C2 REV 1.1.7 2/6/03 TSSOP X9271 HOLD Symbol SO Serial Data Output. A0 Device Address Connect. CS Chip Select. SCK Serial Clock ...
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... S (CS) HIP ELECT When CS is HIGH, the X9271 is deselected and the SO pin is at high impedance, and (unless an internal write cycle is underway) the device will be in the standby state. CS LOW enables the X9271, placing it in the active power mode. It should be noted that after a power-up, a HIGH to LOW transition required prior to the start of any operation ...
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... This can help to reduce system pin count RRAY ESCRIPTION The X9271 is comprised of a resistor array (see Figure 1). The array contains the equivalent of 255 discrete resistive segments that are connected in series. The Figure 1. Detailed Potentiometer Block Diagram SERIAL DATA PATH FROM INTERFACE ...
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... Finally 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 X9271 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 ...
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... CS going HIGH to LOW, is called the Identification byte. The most significant four bits of the slave address are a device type identifier. The ID[3:0] bits is the device id for the X9271; this is fixed as 0101[B] (refer to Table 4). The A1-A0 bits in the ID byte is the internal slave address. The physical device address is defi ...
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... RB RA Two instructions require a two-byte sequence to complete (Figure 2). These instructions transfer data between the host and the X9271; 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 – ...
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... X9271 Figure 2. Two-Byte Instruction Sequence CS SCK ID3 ID2 ID1 ID0 Device ID Figure 3. Three-Byte Instruction Sequence (Write) CS SCL ID3 ID2 ID1 ID0 Internal Device ID Address Figure 4. Three-Byte Instruction Sequence (Read) CS SCL ...
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... X9271 Figure 5. Increment/Decrement Instruction Sequence CS SCL ID3 ID2 ID1 ID0 0 0 Device ID Figure 6. Increment/Decrement Timing Limits SCK INC/DEC CMD ISSUED Table 6. Instruction Set Instruction I3 Read Wiper Counter 1 Register Write Wiper Counter 1 Register Read Data Register 1 Write Data Register ...
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... Data Byte Rising Edge Data Byte CS (Sent by X9271 on SO) Rising Edge Data Byte (Sent by Host on SI) CS Rising Edge CS HIGH-VOLTAGE WRITE CYCLE Edge Characteristics subject to change without notice ...
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... Opcode Addresses I/D I/D Instruction DR/Bank Opcode Addresses www.xicor.com CS Rising Edge Increment/Decrement CS (Sent by Master on SDA) Rising Edge . . . . I/D I/D Data Byte CS (Sent by X9271 on SO) Rising Edge WIP Characteristics subject to change without notice ...
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... R Pin -120 0.4 ±1 ±0.2 ±300 20 10/10/25 , and www.xicor.com Supply Voltage (V 5V ±10% X9271 2.7V to 5.5V Units Test Conditions kΩ T version kΩ U version % mW 25°C, each pot mA Ω = ± 3mA @ Ω = ± 3mA @ ...
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... X9271 D.C. OPERATING CHARACTERISTICS Symbol Parameter I V supply current CC1 CC (active supply current CC2 CC (nonvolatile write current (standby Input leakage current LI I Output leakage current LO V Input HIGH voltage IH V Input LOW voltage IL V Output LOW voltage OL V Output HIGH voltage ...
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... X9271 EQUIVALENT A.C. LOAD CIRCUIT 5V 1462Ω SO pin 2714Ω 100pF AC TIMING Symbol f SSI/SPI clock frequency SCK t SSI/SPI clock cycle time CYC t SSI/SPI clock high time WH t SSI/SPI clock low time WL t Lead time LEAD t Lag time LAG t SI, SCK, HOLD and CS input setup time ...
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... X9271 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 SYMBOL TABLE REV 1.1.7 2/6/03 Parameter Parameter ...
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... X9271 TIMING DIAGRAMS Input Timing CS t LEAD SCK MSB SI High Impedance SO Output Timing CS SCK t V MSB SO ADDR SI Hold Timing CS SCK HOLD REV 1.1.7 2/6/03 t CYC ... ... ... t HO ... t t HSU HH ... HOLD www.xicor.com LAG t RI ...
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... X9271 XDCP Timing (for All Load Instructions) CS SCK MSB SI VWx High Impedance SO Write Protect and Device Address Pins Timing REV 1.1.7 2/6/03 ... t WRL ... (Any Instruction WPASU WPAH www.xicor.com LSB Characteristics subject to change without notice. ...
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... X9271 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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... X9271 Application Circuits (continued) Attenuator – -1/2 ≤ G ≤ +1/2 Inverting Amplifier – Function Generator – + frequency ∝ amplitude ∝ REV 1.1.7 2/6/ 10kΩ ...
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... X9271 PACKAGING INFORMATION See Detail “A” NOTE: ALL DIMENSIONS IN INCHES (IN P ARENTHESES IN MILLIMETERS) REV 1.1.7 2/6/03 14-LEAD PLASTIC, TSSOP, PACKAGE TYPE V .025 (.65) BSC .193 (4.9) .200 (5.1) .0075 (.19) .002 (.05) .0118 (.30) .006 (.15) 0∞ – 8∞ .019 (.50) .029 (.75) Detail A (20X) www.xicor.com .169 (4.3) .252 (6.4) BSC .177 (4.5) ...
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... X9271 16-Bump Chip Scale Package (CSP B16) Package Outline Drawing j m Top View (Marking Side) Package Dimensions Symbol Package Width a Package Length b Package Height c Body Thickness d Ball Height e Ball Diameter f Ball Pitch – Width j Ball Pitch – Length k Ball to Edge Spacing – Width l Ball to Edge Spacing – ...
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... X9271 ORDERING INFORMATION X9271 Device 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. ...