LM8342 NSC | Alldatasheet
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 16
Technical content
Features
n I2C compatible programmable DAC to set the output current n Guaranteed monotonic DAC n Non-volatile memory to hold the setting n EEPROM in system programmable n No external programming voltage required n Maximum interface bus speed is 400 kHz n LLP-10 Package
Applications
n TFT panel factory calibration n Digital potentiometer n Programmable current sink Typical Application 20139201 November 2005 LM8342 Programmable TFT VCOMCalibrator with Non-Volatile Memory © 2005 National Semiconductor Corporation DS201392 www.national.com
Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. ESD Tolerance (Note 2) Human Body Model SCL, SDA Pins: 4 kV All Other Pins: 2.5 kV Machine Model 250V Supply and Reference Voltage V DD 5V AVDD 20V Storage Temperature Range −65˚C to +150˚C Junction Temperature (Note 3) +150˚C Soldering Information Infrared or Convection (20 sec.) 235˚C Wave Soldering (10 sec.) 260˚C Operating Ratings (Note 1) Operating Temperature Range (Note 4) −40˚C to 85˚C Digital Supply (VDD) (Note 5) 2.25V to 3.6V Digital Supply (VDD) @ Programming 2.6V to 3.6V Analog Reference (AVDD) (Note 5) 4.5V to 18V Package Thermal Resistance θJA (Note 3) 52˚C/W
Electrical Characteristics
Unless otherwise specified, all limits are guaranteed for T J = 25˚C, VDD = 3V, AVDD = 15V, VOUT = 1/2 AVDD and RSET = 10 kΩ. Boldface limits apply at the temperature extremes. (Note 6) Symbol Parameter Conditions Min (Note 7) Typ (Note 8) Max (Note 7) Units Supply and Reference Current IDD Supply Current 40 62 µA AIDD Analog Reference Current 8 13 µA Control and Programming SCL, SDA Low Voltage 0 . 3*VDD VHigh Voltage 0 . 7*VDD Input Current 1 µA Frequency 400 kHz WPP/WPN Low Level 0 . 3*VDD V WPP/WPN High Level 0 . 7*VDD V WPN Input Current V IH = 3.0V. (Note 9) 100 µA RON SCL to SCL-S Switch Resistance 150 Ω SDA/SCL Input Capacitance 5 pF SCL-S Input Capacitance 3 pF SDA/SCL/SCL-S load current No Supply, V SDA, VSCL = 3.6V 1 µA Programming Time (Note 4) 200 300 ms IDD @ Programming 10 18 mA Programming Cycles 1000 Reading Cycles 10000 Output Output Settling Time 95% of Final Value 10 µs Start-Up Time 30 µs V OUT Output Voltage V RSET + 0.5V AVDD V IOUT Output Current Adjustability 7 Bits Differential Non-Linearity AV DD = 10V, VOUT = 5V. −1 1 LSBZero Scale Error −1 1.5 Full Scale Error −4 4 Full Scale Range 5 100 µA Voltage Drift V RSET −1 1 LSB LM8342 www.national.com 2
Electrical Characteristics (Continued) Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and test conditions, see the Electrical Chara cteristics tables. Note 2: Human Body Model is 1.5 k Ω in series with 100 pF. Machine Model is 0 Ω in series with 200 pF. Note 3: The maximum power dissipation is a function of T J(MAX), θJA and T A. The maximum allowable power dissipation at any ambient temperature is PD =( TJ(MAX) —T A)/ θJA. All numbers apply for packages soldered directly onto a PC board. Note 4: Programming temperature range 0˚C to 70˚C . Note 5: When AVDD is in the voltage range of 4.5V to 13V, the supply voltage V DD can be in 2.25V to 3.6V range. When AVDD is in the voltage range from 13V to 18V, the supply voltage VDD is limited to the 2.6V to 3.6V range Note 6: Electrical Table values apply only for factory testing conditions at the temperature indicated. Factory testing conditions result in very limited s elf-heating of the device such that TJ =T A. No guarantee of parametric performance is indicated in the electrical tables under conditions of internal self-heating where T J > TA. Note 7: All limits are guaranteed by design or statistical analysis. Note 8: Typical values represent the parametric norm at the time of characterization. Note 9: On-Chip Pull Down Resistor of 30 k Ω. Connection Diagram 10-Pin LLP 20139202 Top View Pin Descriptions Pin Name Pin # Function OUT 1 Current sink output, adjustable in 128 steps. See Application Section for details. AV DD 2 Analog reference voltage input WPN 3 Write protect (input) READ (I2C) WRITE →Reg WRITE →EE SCL Switch WPN = Low yes yes no open WPN = High yes yes yes closed WPP 4 Inverted WP N (output) GND 5 Ground V DD 6 Supply voltage SDA 7 I 2C compatible serial data input/output SCL 8 I 2C compatible serial clock input SCL-S 9 Switched SCL connection. Serial clock input when WP N is set to high SET 10 Maximum output current adjustment pin (see block diagram)
Ordering Information
Package Part Number Package Marking Transport Media NSC Drawing 10-Pin LLP LM8342SD L8342 1k Units Tape and Reel SDA10ALM8342SDX 4.5k Units Tape and Reel LM8342 www.national.com3
www.national.com 4
Typical Performance Characteristics At TJ = 25˚C, VDD = 3V, AV DD = 15V, V OUT = 1/2 AV DD and RSET =1 0k Ω, unless otherwise specified. IDD vs. VDD IDD vs. Temperature 20139227 20139228 AVDD Startup (Full Scale) V DD Startup (Full Scale) 20139220 20139219 IOUT vs. RSET IOUT vs. RSET 20139216 20139215 LM8342 www.national.com5
Typical Performance Characteristics At TJ = 25˚C, VDD = 3V, AV DD = 15V, V OUT = 1/2 AV DD and RSET =1 0k Ω, unless otherwise specified. (Continued) IOUT Current Step Negative (Full Scale) I OUT Current Step Positive (Full Scale) 20139207 20139208 IOUT vs. VOUT IOUT Error vs. VOUT 20139217 20139214 Gain & Offset Change vs. V OUT Differential Non-Linearity Error vs. DAC (VOUT = 18V) 20139222 20139221 LM8342 www.national.com 6
Typical Performance Characteristics At TJ = 25˚C, VDD = 3V, AV DD = 15V, V OUT = 1/2 AV DD and RSET =1 0k Ω, unless otherwise specified. (Continued) IOUT Error vs. VDD IOUT Error vs. AVDD 20139210 20139226 IOUT Error vs. Temperature Total Unadjusted Error vs. DAC 20139213 20139209 Integral Non-Linearity Error vs. DAC Differential Non-Linearity Error vs. DAC 20139212 20139211 LM8342 www.national.com7
Typical Performance Characteristics At TJ = 25˚C, VDD = 3V, AV DD = 15V, V OUT = 1/2 AV DD and RSET =1 0k Ω, unless otherwise specified. (Continued) RON vs. SCL-S Voltage 20139225 LM8342 www.national.com 8
calculated using Equation (1). perature coefficient is recommended. short functional description. TABLE 1. Pin Descriptions more detail in the next chapter. DD Analog reference voltage for the DAC. output current, see Equation (1).
- Prohibits programming the EEPROM,
the “P-bit” in the serial communication. N switches the SCL-S clock line. should turn off the original SCL clock. compatible interface bus is given in Figure 5. is specified in the Electrical Characteristics table. FIGURE 5. System Using an I 2C compatible Bus
TABLE 2. Detailed Description of I 2C compatible only when the bus is not busy. FIGURE 6. Timing Diagram
TABLE 3. P-bit Truth Table FIGURE 7. Programmable Current Sink
TABLE 4. Overview Resistor Values for Different R SET using the I 2C compatible interface for communication. register or to store the data in the EEPROM. layout to reduce this parasitic capacitance. FIGURE 10. LM8342 Evaluation System
Physical Dimensions inches (millimeters) unless otherwise noted 10-Pin LLP National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. For the most current product information visit us at www.national.com. LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. 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, or to affect its safety or effectiveness. BANNED SUBSTANCE COMPLIANCE National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. Leadfree products are RoHS compliant. National Semiconductor Americas Customer Support Center Email: new.feedback@nsc.com Tel: 1-800-272-9959 National Semiconductor Europe Customer Support Center Fax: +49 (0) 180-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 69 9508 6208 English Tel: +44 (0) 870 24 0 2171 Français Tel: +33 (0) 1 41 91 8790 National Semiconductor Asia Pacific Customer Support Center Email: ap.support@nsc.com National Semiconductor Japan Customer Support Center Fax: 81-3-5639-7507 Email: jpn.feedback@nsc.com Tel: 81-3-5639-7560 www.national.com LM8342 Programmable TFT V COM Calibrator with Non-Volatile Memory