X9221 Xicor, X9221 Datasheet
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X9221
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X9221 Summary of contents
Page 1
... The X9221 integrates two nonvolatile E 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 ...
Page 2
... The master will always initiate data transfers and provide the clock for both transmit and receive operations. There- fore, the X9221 will be considered a slave device in all applications. Clock and Data Conventions Data states on the SDA line can change only during SCL LOW periods (t are reserved for indicating start and stop conditions ...
Page 3
... This involves issuing the start condition followed by the device slave address. If the X9221 is still busy with the write operation no ACK will be returned. If the X9221 has completed the write operation an ACK will be returned and the master can then proceed with the next operation ...
Page 4
... Four instructions require a three-byte sequence to complete. These instructions transfer data between the host and the X9221; either between the host and one of the data registers or directly between the host and the WCR. These instructions are: Read WCR, read the current wiper position of the selected pot ...
Page 5
... X9221 Figure 4. Three-Byte Command Sequence SCL SDA Figure 5. Increment/Decrement Command Sequence SCL SDA Figure 6. Increment/Decrement Timing Limits INC/DEC CMD ISSUED SCL SDA ...
Page 6
... X9221 Table 1. Instruction Set Instruction Read WCR 1 0 Write WCR 1 0 Read Data 1 0 Register Write Data 1 1 Register XFR Data Reg ister to WCR XFR WCR Data Register Global XFR Data 0 0 Register to WCR Global XFR WCR ...
Page 7
... IF WCR = 00[H] THEN WCR = 3F[H] THEN The WCR is a volatile register; that is, its contents are lost when the X9221 is powered-down. Although the register is automatically loaded with the value in R0 upon power-up, it should be noted this may be different from the value present at power-down. ...
Page 8
... SS ......... not implied. Exposure to absolute maximum rating condi- tions for extended periods may affect device reliability. Max. Supply Voltage +70 C X9221 +85 C +125 C 3079 PGM T02 Limits Min. Typ. Max. Units – ...
Page 9
... X9221 ENDURANCE AND DATA RETENTION Parameter Minimum Endurance Data Retention CAPACITANCE Symbol (5) C Input/Output Capacitance (SDA) I/O IN (5) C Input Capacitance (A0, A1, A2, A3 and SCL) POWER-UP TIMING Symbol PUR (6) t Power-up to Initiation of Read Operation (6) t Power-up to Initiation of Write Operation PUW A.C. CONDITIONS OF TEST Input Pulse Levels ...
Page 10
... X9221 A.C. CHARACTERISTICS (Over recommended operating conditions unless otherwise stated) Symbol f SCL Clock Frequency SCL t Clock LOW Period LOW t Clock HIGH Period HIGH t SCL and SDA Rise Time R t SCL and SDA Fall Time F Ti Noise Suppression Time Constant (Glitch Filter) t Start Condition Setup Time (for a Repeated ...
Page 11
... X9221 Figure 11. Output Bus Timing SCL SDA OUT (ACK) SDA Figure 12. Start Stop Timing SCL t SU:STA SDA DATA IN Figure 13. Write Cycle and Wiper Response Timing SCL CLOCK 8 SDA IN SDA WIPER OUTPUT SDA OUT START CONDITION t HD:STA CLOCK 9 STOP ACK ...
Page 12
... X9221 PACKAGING INFORMATION 20-LEAD PLASTIC DUAL IN-LINE PACKAGE TYPE P PIN 1 INDEX PIN 1 SEATING PLANE (3.81) 0.150 (2.92) 0.1150 0.014 (0.356) 0.008 (0.2032) NOTE: 1. ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS) 2. PACKAGE DIMENSIONS EXCLUDE MOLDING FLASH 1.060 (26.92) 0.980 (24.89) 0.900 (23.66) REF. 0.10 (BSC) (2.54) 0.070 (1.778) 0.045 (1.143) 0.300 (7 ...
Page 13
... X9221 PACKAGING INFORMATION 20-LEAD PLASTIC SMALL OUTLINE GULL WING 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) 0.014 (0.35) 0.020 (0.50) 0.496 (12.60) 0.508 (12.90 0.420" 0.007 (0.18) 0.011 (0.28) FOOTPRINT 13 0.290 (7.37) 0.393 (10.00) 0.299 (7.60) 0.420 (10.65) 0.092 (2.35) ...
Page 14
... A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system affect its safety or effectiveness. X9221 ...