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X9221WSM Schematic ( PDF Datasheet ) - Xicor

Teilenummer X9221WSM
Beschreibung Dual E2POT Nonvolatile Digital Potentiometer
Hersteller Xicor
Logo Xicor Logo 




Gesamt 14 Seiten
X9221WSM Datasheet, Funktion
APPLICATION NOTES
AVA I L A B L E
AN20 • AN42 • AN44–48 • AN50 • AN52 • AN53 • AN73
XATed9vr2ma2n1icneaIlnVfoormltaatgioen±5V, 64 Taps
X9221
Dual E2POTNonvolatile Digital Potentiometer
FEATURES
Two E2POTs in One Package
Two-Wire Serial Interface
Register Oriented Format
—Directly Write Wiper Position
—Read Wiper Position
—Store as Many as Four Positions per Pot
Instruction Format
—Quick Transfer of Register Contents to
Resistor Array
Low Power CMOS
Direct Write Cell
—Endurance - 100,000 Writes per Register
—Register Data Retention - 100 years
8 Bytes of E2PROM memory
3 Resistor Array Values
—2Kto 50KMask Programmable
Resolution: 64 Taps each Pot
20-Lead Plastic DIP and 20-Lead SOIC Packages
DESCRIPTION
The X9221 integrates two nonvolatile E2POT™ digitally
controlled potentiometers on a monolithic CMOS micro-
circuit.
The X9221 contains two resistor arrays, each com-
posed of 63 resistive elements. Between each element
and at either end are tap points accessible to the wiper
elements. The position of the wiper element on the array
is controlled by the user through the two-wire serial bus
interface.
Each resistor array has associated with it a wiper counter
register and four 8-bit data registers that can be directly
written and read by the user. The contents of the wiper
counter register control the position of the wiper on the
resistor array.
The data register may be read or written by the user. The
contents of the data registers can be transferred to the
wiper counter register to position the wiper. The current
wiper position can be transferred to any one of its
associated data registers.
FUNCTIONAL DIAGRAM
SCL
SDA
A0
A1
A2
A3
INTERFACE
AND
CONTROL
CIRCUITRY
8
DATA
R0 R1
WIPER
COUNTER
REGISTER
R2 R3 (WCR)
VH0
VL0
VW0
R0 R1 WIPER
COUNTER RESISTOR
REGISTER ARRAY
R2 R3 (WCR)
POT 1
VH1
VL1
VW1
3079 ILL F07.1
© Xicor, Inc. 1994, 1995, 1996 Patents Pending.
3079-1.6 6/12/96 T1/C1/D0 NS
1
Characteristics subject to change without notice






X9221WSM Datasheet, Funktion
X9221
Table 1. Instruction Set
Instruction Format
Instruction
Read WCR
Write WCR
Read Data
Register
Write Data
Register
XFR Data Reg-
ister to WCR
I3 I2 I1 I0 0 P0
R1 Ro
Operation
1 0 0 1 0 1/0 N/A(7) N/A Read the contents of the Wiper Counter
Register pointed to by P0
1 0 1 0 0 1/0 N/A N/A Write new value to the Wiper Counter
Register pointed to by P0
1 0 1 1 0 1/0 1/0 1/0 Read the contents of the Register
pointed to by P0 and R1–R0
1 1 0 0 0 1/0 1/0 1/0 Write new value to the Register
pointed to by P0 and R1–R0
1 1 0 1 0 1/0 1/0 1/0 Transfer the contents of the Register
pointed to by P0 and R1–R0
to its associated WCR
XFR WCR to
Data Register
Global XFR Data
Register to WCR
1 1 1 0 0 1/0 1/0 1/0 Transfer the contents of the WCR
pointed to by P0 to the Register
pointed to by R1–R0
0 0 0 1 N/A N/A 1/0 1/0 Transfer the contents of all four Data
Registers pointed to by R1–R0 to their
respective WCR
Global XFR WCR 1 0 0 0 N/A N/A 1/0 1/0 Transfer the contents of all WCRs
to Data Register
to their respective data Registers
pointed to by R1–R0
Increment/Decre- 0 0 1 0 0 1/0 N/A N/A Enable Increment/decrement of the
ment Wiper
WCR pointed to by P0
3079 PGM T11.1
Notes: (7) N/A = Not applicable or don’t care; that is, a data register is not involved in the operation and need not be addressed (typical)
Figure 7. Acknowledge Response from Receiver
SCL FROM
MASTER
1
DATA
OUTPUT
FROM
TRANSMITTER
DATA
OUTPUT
FROM
RECEIVER
START
6
89
ACKNOWLEDGE
3079 ILL F14

6 Page









X9221WSM pdf, datenblatt
X9221
PACKAGING INFORMATION
20-LEAD PLASTIC DUAL IN-LINE PACKAGE TYPE P
1.060 (26.92)
0.980 (24.89)
PIN 1 INDEX
PIN 1
0.900 (23.66)
REF.
0.280 (7.11)
0.240 (6.096)
0.005 (0.127)
SEATING
PLANE
(3.81) 0.150
(2.92) 0.1150
0.10 (BSC)
(2.54)
0.300
(7.62) (BSC)
0.195 (4.95)
0.115 (2.92)
––
0.015 (0.38)
0.070 (1.778)
0.045 (1.143)
0.022 (0.559)
0.014 (0.356)
0.014 (0.356)
0.008 (0.2032)
0°
15°
NOTE:
1. ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS)
2. PACKAGE DIMENSIONS EXCLUDE MOLDING FLASH
3926 FHD F18.1
12

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