X9250-2.7 INTERSIL [Intersil Corporation], X9250-2.7 Datasheet

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X9250-2.7

Manufacturer Part Number
X9250-2.7
Description
Low Noise/Low Power/SPI Bus/256 Taps
Manufacturer
INTERSIL [Intersil Corporation]
Datasheet
Quad Digitally Controlled Potentiometers
(XDCP™)
FEATURES
• Four potentiometers in one package
• 256 resistor taps/pot - 0.4% resolution
• SPI serial interface
• Wiper resistance, 40Ω typical @ V
• Four nonvolatile data registers for each pot
• Nonvolatile storage of wiper position
• Standby current < 5µA max (total package)
• Power supplies
• 100kΩ, 50kΩ total pot resistance
• High reliability
• 24-lead SOIC, 24-lead TSSOP
• Dual supply version of X9251
BLOCK DIAGRAM
HOLD
SCK
V
V
—V
—V+ = 2.7V to 5.5V
—V– = -2.7V to -5.5V
—Endurance – 100,000 data changes per bit per
—Register data retention - 100 years
WP
SO
CS
A0
A1
CC
SS
SI
register
CC
= 2.7V to 5.5V
Interface
Circuitry
Control
V+
V-
and
Data
®
8
1
Data Sheet
R
R
R
R
0
2
0
2
CC
R
R
R
R
1
3
1
3
= 5V
Register
Register
Counter
Counter
(WCR)
(WCR)
Wiper
Wiper
1-888-INTERSIL or 1-888-352-6832
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
XDCP is a trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2005. All Rights Reserved
Resistor
Array
Pot1
Pot 0
V
V
DESCRIPTION
The
potentiometers (XDCP) on a monolithic CMOS
integrated circuit.
The digitally 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. Each potentiometer has associated
with it a volatile Wiper Counter Register (WCR) and 4
nonvolatile Data Registers (DR0:DR3) that can be
directly written to and read by the user. The contents
of the WCR controls the position of the wiper on the
resistor array though the switches. Power up recalls
the contents of DR0 to the WCR.
The XDCP can be used as a three-terminal
potentiometer or as a two-terminal variable resistor in
a wide variety of applications including control,
parameter adjustments, and signal processing.
Low Noise/Low Power/SPI Bus/256 Taps
W0
W1
V
V
V
H1
V
L1
L0
/R
/R
H0
/R
/R
/R
W0
W1
/R
March 25, 2005
H1
L1
L0
X9250
All other trademarks mentioned are the property of their respective owners.
H0
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
R
R
R
R
0
2
0
2
integrates
R
R
R
R
1
3
1
3
Register
Counter
Register
Counter
(WCR)
Wiper
(WCR)
Wiper
4
Resistor
digitally
Resistor
Array
Pot 2
Array
Pot 3
X9250
FN8165.1
V
V
V
V
V
V
controlled
L2
H2
L3
H3
W2
W3
/R
/R
/R
/R
/R
/R
L2
H3
H2
H3
W2
W3

Related parts for X9250-2.7

X9250-2.7 Summary of contents

Page 1

... CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-352-6832 XDCP is a trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2005. All Rights Reserved All other trademarks mentioned are the property of their respective owners. X9250 FN8165.1 integrates 4 digitally ...

Page 2

... The SCK input is used to clock data into and out of the X9250. Chip Select (CS) When CS is HIGH, the X9250 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 X9250, placing it in the active power mode ...

Page 3

... 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 X9250 is powered- down. Although the register is automatically loaded with the value in R0 upon power-up, this may be different from the value present at power-down ...

Page 4

... The WIP bit is read with a read status command. INSTRUCTIONS Identification (ID) Byte The first byte sent to the X9250 from the host, following a CS going HIGH to LOW, is called the Identification byte. The most significant four bits of the slave address are a device type identifier, for the X9250 this is fixed as 0101[B] (refer to Figure 2) ...

Page 5

... These instructions transfer data between 1 0 the host and the X9250; either between the host and one of the data registers or directly between the host and the Wiper Counter Register. These instructions are: – Read Wiper Counter Register—read the current wiper position of the selected pot, – ...

Page 6

... A1 A0 Figure 6. Three-Byte Instruction Sequence (Read) CS SCL Figure 7. Increment/Decrement Instruction Sequence CS SCK X9250 ...

Page 7

... XFR Wiper Counter 1 Register to Data Register Global XFR Data Register 0 to Wiper Counter Register Global XFR Wiper Counter 1 Register to Data Register Increment/Decrement 0 Wiper Counter Register Read Status (WIP bit X9250 Voltage Out Instruction Set ...

Page 8

... WCR opcode addresses (sent by Host on SI instruction DR and WCR opcode addresses (sent by X9250 on SO instruction DR and WCR opcode addresses (sent by host on SI) W ...

Page 9

... DR CS opcode addresses Rising R R Edge instruction Data Byte opcode (sent by X9250 on SO HIGH-VOLTAGE WRITE CYCLE CS Rising Edge . . . I/D I/D HIGH-VOLTAGE WRITE CYCLE CS Rising W Edge I P FN8165.1 March 25, 2005 ...

Page 10

... Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Max. Device +70°C X9250 +85°C X9250-2.7 Limits Min. Typ. 150 X9250 +4.5 X9250-2.7 +2.7 X9250 -5.5 X9250-2.7 -5 pin -120 0.6 ±300 TOTAL 10/10/25 /R )/255, single pot L Supply Voltage ( ± 10% 2 ...

Page 11

... PUR PUW issued. These parameters are periodically sampled and not 100% tested. (7) Sample tested only. A.C. TEST CONDITIONS I nput pulse levels V Input rise and fall times 10ns Input and output timing level V 11 X9250 Limits Min. Typ. Max. 400 0 ...

Page 12

... HOLD high to output in low Noise suppression time constant at SI, SCK, HOLD and CS inputs deselect time CS t WP, A0 and A1 setup time WPASU t WP, A0 and A1 hold time WPAH 12 X9250 EQUIVALENT A.C. LOAD CIRCUIT 10pF SDA Output Parameter 5V 2.7V 1533Ω 100pF 100pF Min. ...

Page 13

... Don’t Care: Changing: Changes State Not Allowed Known N/A Center Line is High Impedance TIMING DIAGRAMS Input Timing CS t LEAD SCK MSB SI High Impedance SO 13 X9250 Parameter Parameter t CYC ... ... Typ. Max. Unit Min. Max. Unit 10 µs 10 µ ...

Page 14

... Output Timing CS SCK t V MSB SO ADDR SI Hold Timing CS SCK HOLD XDCP Timing (for all Load Instructions) CS SCK MSB SI VWx High Impedance SO 14 X9250 ... t HO ... t t HSU HH ... HOLD ... t WRL ... t DIS LSB t LZ LSB FN8165.1 March 25, 2005 ...

Page 15

... XDCP Timing (for Increment/Decrement Instruction) CS SCK VWx SI ADDR High Impedance SO Write Protect and Device Address Pins Timing X9250 ... t WRID ... ... Inc/Dec Inc/Dec (Any Instruction WPAH WPASU FN8165.1 March 25, 2005 ...

Page 16

... Offset Voltage Adjustment 100kΩ – + TL072 10kΩ 10kΩ 10kΩ +12V -12V 16 X9250 Two terminal Variable Resistor; Variable current Voltage Regulator (REG) = 1.25V (1+R O Comparator with Hysterisis ...

Page 17

... -1/2 ≤ G ≤ +1/2 Inverting Amplifier – – + frequency ∝ amplitude ∝ X9250 10kΩ Equivalent L-R Circuit Filter ...

Page 18

... PACKAGING INFORMATION 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) 18 X9250 24-Lead Plastic, SOIC, Package Code S24 0.014 (0.35) 0.020 (0.50) 0.598 (15.20) 0.610 (15.49) X 45° 0.009 (0.22) 0.420" 0.013 (0.33) FOOTPRINT 0.393 (10.00) 0.290 (7.37) 0.299 (7.60) 0.420 (10.65) ...

Page 19

... BSC .303 (7.70) .311 (7.90) .0075 (.19) .0118 (.30) 0° - 8° .020 (.50) .030 (.75) Detail A (20X) See Detail “A” NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS) 19 X9250 24-Lead Plastic, TSSOP, Package Code V24 .169 (4.3) .252 (6.4) BSC .177 (4.5) .047 (1.20) .002 (.06) .005 (.15) .010 (.25) Gage Plane Seating Plane (1.78) (0 ...

Page 20

... However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com 20 X9250 ...

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