LM74 SPI/MICROWIRE™ 12-Bit Plus Sign Temperature Sensor General Description n Electronic Test Equipment The LM74 is a temperature sensor, Delta-Sigma analog-todigital converter with an SPI and MICROWIRE compatible interface. The host can query the LM74 at any time to read temperature. A shutdown mode decreases power consumption to less than 10 µA. This mode is useful in systems where low average power consumption is critical. Features The LM74 has 12-bit plus sign temperature resolution (0.0625˚C per LSB) while operating over a temperature range of −55˚C to +150˚C. The LM74’s 3.0V to 5.5V supply voltage range, low supply current and simple SPI interface make it ideal for a wide range of applications. These include thermal management and protection applications in hard disk drives, printers, electronic test equipment, and office electronics. The LM74 is available in the SO-8 package as well as an 5-Bump micro SMD package. n 0.0625˚C temperature resolution. n Shutdown mode conserves power between temperature reading n SPI and MICROWIRE Bus interface n 5-Bump micro SMD package saves space Key Specifications j Supply Voltage j Supply Current 3.0V or 2.65V to 5.5V operating 265µA (typ) 520µA (max) shutdown 3µA (typ) −10˚C to 65˚C ± 1.25˚C(max) ± 2.1˚C(max) ± 3˚C(max) j Temperature Applications n n n n Accuracy −25˚C to 110˚C System Thermal Management Personal Computers Disk Drives Office Electronics −55˚C to 125˚C Simplified Block Diagram 10090901 MICROWIRE ® is a registered trademark of National Semiconductor Corporation. TRI-STATE ® is a registered trademark of National Semiconductor Corporation. © 2003 National Semiconductor Corporation DS100909 www.national.com LM74 SPI/MICROWIRE 12-Bit Plus Sign Temperature Sensor April 2003 LM74 Connection Diagrams SO-8 5-Bump micro SMD 10090902 TOP VIEW NS Package Number M08A 10090924 Note: - Pin numbers are referenced to the package marking text orientation. Pin 1 is designated by the square. - Reference JEDEC Registration MO-211, variation BC - The top 4 characters designate the date code. The bottom 3 characters designate the device type (see ordering information). TOP VIEW NS Package Number BPD05MPB Ordering Information Order Number LM74CIM-3 Package Marking LM74CIM-3 NS Package Number Supply Voltage SO-8, M08A Transport Media 3.0V to 3.6V 95 Units in Rail LM74CIMX-3 LM74CIM-3 SO-8, M08A 3.0V to 3.6V 2500 Units in Tape and Reel LM74CIM-5 LM74CIM-5 SO-8, M08A 4.5V to 5.5V 95 Units in Rail LM74CIMX-5 LM74CIM-5 SO-8, M08A 4.5V to 5.5V 2500 Units in Tape and Reel LM74CIBP-3 T8 micro SMD, BPD05MPB 2.65V to 3.6V 250 Units in Tape and Reel LM74CIBPX-3 T8 micro SMD, BPD05MPB 2.65V to 3.6V 3000 Units in Tape and Reel LM74CIBP-5 T9 micro SMD, BPD05MPB 4.5V to 5.5V 250 Units in Tape and Reel LM74CIBPX-5 T9 micro SMD, BPD05MPB 4.5V to 5.5V 3000 Units in Tape and Reel www.national.com 2 LM74 Pin Descriptions Label SO-8 Pin # micro SMD Pin # SI/O 1 1 Slave Input/Output - Serial bus bi-directional data line. Schmitt trigger input. SC 2 5 Slave Clock - Serial bus clock Schmitt trigger input From Controller line. NC 3 GND 4 NC NC CS 7 8 + V Function Typical Connection From and to Controller No Connection No Connection Power Supply Ground Ground 5 No Connection No Connection 6 No Connection No Connection 3 Chip Select input. From Controller 2 Positive Supply Voltage Input DC Voltage from 3.0V to 5.5V for the LM74CIM and 2.65V to 5.5V for the LM74CIBP. Bypass with a 0.1 µF ceramic capacitor. 4 Typical Application 10090903 FIGURE 1. COP Microcontroller Interface 3 www.national.com LM74 Absolute Maximum Ratings Supply Voltage LM74CIM and LM74CIBP all other pins (Note 1) −0.3V to 6.0V Machine Model −0.3V to V+ + 0.3V Voltage at any Pin Input Current at any Pin (Note 2) 5 mA Storage Temperature 200V 20 mA Operating Ratings −65˚C to +150˚C Specified Temperature Range Package Input Current (Note 2) Soldering Information, Lead Temperature SO-8 Package (Note 3) Vapor Phase (60 seconds) Infrared (15 seconds) TMIN to TMAX (Note 5) LM74CIBP LM74CIM 215˚C 220˚C −40˚C to +125˚C −55˚C to +150˚C Supply Voltage Range (+VS) ESD Susceptibility (Note 4) Human Body Mode LM74CIBP SC, pin 5 2000V LM74CIBP +2.65V to +5.5V LM74CIM +3.0V to +5.5V 1900V Temperature-to-Digital Converter Characteristics Unless otherwise noted, these specifications apply for V+ = 2.65V to 3.6V for the LM74CIBP -3, V+ = 3.0V to 3.6V for the LM74CIM -3 and V+ = 4.5V to 5.5V for the LM74 -5 (Note 6). Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ =+25˚C, unless otherwise noted. LM74-5 Limits (Note 8) LM74-3 Limits (Note 8) Units (Limit) ± 1.25 ˚C (max) TA = −25˚C to +110˚C ± 1.25 ± 2.1 +2.65/−2.15 ˚C (max) TA = −40˚C to +85˚C +2.65/−1.65 ± 2.15 ˚C (max) TA = −40˚C to +110˚C +2.65/ −2.0 +2.65/−2.15 ˚C (max) TA = −55˚C to +125˚C ± 3.0 ± 5.0 ± 3.5 ± 5.0 ˚C (max) 425 425 ms (max) ms (max) Parameter Typical (Note 7) Conditions TA = −10˚C to +65˚C Temperature Error (Note 6) TA = −55˚C to +150˚C Resolution 13 Temperature Conversion Time Quiescent Current SO-8 (Note 9) Bits 280 micro SMD (Note 9) SO-8 Serial Bus Inactive micro SMD SO-8 Serial Bus Active micro SMD ˚C (max) 611 925 925 310 520 520 µA (max) 265 470 470 µA (max) 310 µA 310 µA SO-8 Shutdown Mode, + micro SMD V = 3.3V 7 µA 3 µA SO-8 Shutdown Mode, + micro SMD V = 5V 8 µA 4 µA Logic Electrical Characteristics DIGITAL DC CHARACTERISTICS Unless otherwise noted, these specifications apply for V+ = 2.65V to 3.6V for the LM74CIBP -3, V+ = 3.0V to 3.6V for the LM74CIM -3 and V+ = 4.5V to 5.5V for the LM74 -5 (Note 6). Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ =+25˚C, unless otherwise noted. Symbol VIN(1) VIN(0) Parameter Conditions Typical (Note 7) Logical “1” Input Voltage Logical “0” Input Voltage Limits (Note 8) V+ x 0.7 V (min) V+ + 0.3 V (max) −0.3 V (min) + Input Hysteresis Voltage IIN(1) www.national.com Logical “1” Input Current Units (Limit) V x 0.3 V (max) V+ = 3.0V to 3.6V 0.8 0.35 V (min) V+ = 4.5V to 5.5V 0.8 0.33 V (min) 0.005 3.0 µA (max) VIN = V+ 4 LM74 Logic Electrical Characteristics (Continued) DIGITAL DC CHARACTERISTICS Unless otherwise noted, these specifications apply for V+ = 2.65V to 3.6V for the LM74CIBP -3, V+ = 3.0V to 3.6V for the LM74CIM -3 and V+ = 4.5V to 5.5V for the LM74 -5 (Note 6). Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ =+25˚C, unless otherwise noted. Symbol Parameter IIN(0) Logical “0” Input Current Conditions VIN = 0V Typical (Note 7) Limits (Note 8) Units (Limit) −0.005 −3.0 µA (min) CIN All Digital Inputs VOH High Level Output Voltage IOH = −400 µA 2.4 V (min) VOL Low Level Output Voltage IOL = +2 mA 0.4 V (max) IO_TRI-STATE TRI-STATE Output Leakage Current VO = GND V O = V+ −1 +1 20 pF µA (min) µA (max) SERIAL BUS DIGITAL SWITCHING CHARACTERISTICS Unless otherwise noted, these specifications apply for V+ = 2.65V to 3.6V for the LM74CIBP -3, V+ = 3.0V to 3.6V for the LM74CIM -3 and V+ = 4.5V to 5.5V for the LM74 -5 (Note 6); CL (load capacitance) on output lines = 100 pF unless otherwise specified. Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = +25˚C, unless otherwise noted. Symbol Parameter Conditions Typical (Note 7) Limits (Note 8) Units (Limit) t1 SC (Clock) Period 0.16 DC µs (min) (max) t2 CS Low to SC (Clock) High Set-Up Time 100 ns (min) t3 CS Low to Data Out (SO) Delay 70 ns (max) t4 SC (Clock) Low to Data Out (SO) Delay 100 ns (max) t5 CS High to Data Out (SO) TRI-STATE 200 ns (max) t6 SC (Clock) High to Data In (SI) Hold Time 50 ns (min) t7 Data In (SI) Set-Up Time to SC (Clock) High 30 ns (min) 10090904 FIGURE 2. Data Output Timing Diagram 5 www.national.com LM74 Logic Electrical Characteristics (Continued) 10090905 FIGURE 3. TRI-STATE Data Output Timing Diagram 10090906 FIGURE 4. Data Input Timing Diagram Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when operating the device beyond its rated operating conditions. Note 2: When the input voltage (VI) at any pin exceeds the power supplies (VI < GND or VI > +VS) the current at that pin should be limited to 5 mA. The 20 mA maximum package input current rating limits the number of pins that can safely exceed the power supplies with an input current of 5 mA to four. Note 3: See AN-450 “Surface Mounting Methods and Their Effect on Product Reliability” or the section titled “Surface Mount” found in a current National Semiconductor Linear Data Book for other methods of soldering surface mount devices. Note 4: Human body model, 100 pF discharged through a 1.5 kΩ resistor. Machine model, 200 pF discharged directly into each pin. Note 5: The life expectancy of the LM74 will be reduced when operating at elevated temperatures. LM74 θJA (thermal resistance, junction-to-ambient) when attached to a printed circuit board with 2 oz. foil is summarized in the table below: NS Package Number Thermal Resistance (θJA) LM74CIM M08A 160˚C/W LM74CIBP BPD05MPB 250˚C/W Device Number Note 6: All SOP (LM74CIM) parts will function over the V+ supply voltage range of 3V to 5.5V. All micro SMD (LM74SIBP) parts will function over the V+ supply voltage range of 2.65V to 5.5V. The SOP (LM74CIM) parts are tested and specified for rated temperature error at their nominal supply voltage for temperature ranges of −10˚C to +65˚C, −55˚C to +125˚C and −55˚C to +150˚C. For the SOP (LM74CIM) parts the temperature error specifications for temperature ranges of −40˚C to +85˚C, −25˚C to +110˚C and −40˚C to +110˚C include error induced by power supply variation of ± 5% from the nominal value. For the LM74CIM (SOP) parts the temperature error will increase by ± 0.3˚C for a power supply voltage (V+) variation of ± 10% from the nominal value. For the LM74CIBP-3 (micro SMD) parts all accuracies are guaranteed over the supply range of 2.65V to 3.6V, except for the temperature ranges of -55˚C to 125˚C and −55˚C to +150˚C where the accuracy applies for the nominal supply voltage of 3.3V. For the LM74CIBP-5 (micro SMD) parts all accuracies are guranteed over the supply range of 4.75V to 5.25V, except for the temperature ranges of -55˚C to 125˚C and −55˚C to +150˚C where the accuracy applies for the nominal supply voltage of 5.0V. For the LM74CIBP over -55˚C to 125˚C and −55˚C to +150˚C, a power supply variation of ± 10% will degrade the accuracy by ± 0.3˚C. www.national.com 6 LM74 Logic Electrical Characteristics (Continued) Note 7: Typicals are at TA = 25˚C and represent most likely parametric norm. Note 8: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level). Note 9: This specification is provided only to indicate how often temperature data is updated. The LM74 can be read at any time without regard to conversion state (and will yield last conversion result). A conversion in progress will not be interrupted. The output shift register will be updated at the completion of the read and a new conversion restarted. Note 10: For best accuracy, minimize output loading. Higher sink currents can affect sensor accuracy with internal heating. This can cause an error of 0.64˚C at full rated sink current and saturation voltage based on junction-to-ambient thermal resistance. Electrical Characteristics 10090908 FIGURE 5. Temperature-to-Digital Transfer Function (Non-linear scale for clarity) TRI-STATE Test Circuit 10090907 FIGURE 6. 7 www.national.com LM74 Typical Performance Characteristics Average Power-On Reset Voltage vs Temperature Static Supply Current vs Temperature (SO-8) 10090923 10090921 Temperature Error (SO-8) Static Supply Current vs Temperature (micro SMD) 10090925 10090922 conversion, the register will contain temperature measurement data in bits D15 (the temperature data MSB) through D3 (the temperature data LSB). Bit D2 will be fixed high; bits D1 and D0 are undefined. See Section 1.5.3 for a diagram of the Temperature Regisiter contents after the first complete temperature conversion. Note that bit D2 represents a complete conversion flag. During POR it is low and, after the first temperature conversion is complete, it goes high. This bit can be polled to indicate when the POR data in the Temperature Register has been replaced with valid temperature data. After the first conversion, and any subsequent conversions, the value in the temperature register does not change until the completion of the next conversion, at which time the temperature register is updated with the latest temperature value. 1.0 Functional Description The LM74 temperature sensor incorporates a band-gap type temperature sensor and 12-bit plus sign ∆Σ ADC (DeltaSigma Analog-to-Digital Converter). Compatibility of the LM74’s three wire serial interface with SPI and MICROWIRE allows simple communications with common microcontrollers and processors. Shutdown mode can be used to optimize current drain for different applications. A Manufacture’s/ Device ID register identifies the LM74 as National Semiconductor product. 1.1 POWER UP AND POWER DOWN When the supply voltage is less than about 1.6V (typical), the LM74 is considered powered down. The LM74 always powers up in a known state. When the supply voltage rises above 1.6V (typical), an internal Power-On Reset (POR) occurs and the temperature register will then contain a value of 1111 1111 0000 00XX, where XX indicates undefined values. See Section 1.5.2 for a diagram of the Temperature Regisiter contents after POR but before completion of the first temperature conversion. The LM74 power-up default condition is continuous conversion mode. After completion of the first full temperature www.national.com 1.2 SERIAL BUS INTERFACE The LM74 operates as a slave and is compatible with SPI or MICROWIRE bus specifications. Data is clocked out on the falling edge of the serial clock (SC), while data is clocked in on the rising edge of SC. A complete transmit/receive com- 8 Note that one complete temperature conversion period will have to pass before the LM74 Temperature register will contain the new temperature data. Until then, it will contain a "stale" temperature (the data that was in the register before going into shutdown mode). (Continued) munication will consist of 32 serial clocks. The first 16 clocks comprise the transmit phase of communication, while the second 16 clocks are the receive phase. When CS is high SI/O will be in TRI-STATE ® . Communication should be initiated by taking chip select (CS) low. This should not be done when SC is changing from a low to high state. Once CS is low the serial I/O pin (SI/O) will transmit the first bit of data. The master can then read this bit with the rising edge of SC. The remainder of the data will be clocked out by the falling edge of SC. Once the 14 bits of data (one sign bit, twelve temperature bits and 1 high bit) are transmitted the SI/O line will go into TRI-STATE. CS can be taken high at any time during the transmit phase. If CS is brought low in the middle of a conversion the LM74 will complete the conversion and the output shift register will be updated after CS is brought back high. The receive phase of a communication starts after 16 SC periods. CS can remain low for 32 SC cycles. The LM74 will read the data available on the SI/O line on the rising edge of the serial clock. Input data is to an 8-bit shift register. The part will detect the last eight bits shifted into the register. The receive phase can last up to 16 SC periods. All ones must be shifted in order to place the part into shutdown. A zero in any location will take the LM74 out of shutdown. The following codes should only be transmitted to the LM74: • 00 hex 1.3 TEMPERATURE DATA FORMAT Temperature data is represented by a 13-bit, two’s complement word with an LSB (Least Significant Bit) equal to 0.0625˚C: Temperature Digital Output Binary Hex +150˚C 0100 1011 0000 0111 4B 07h +125˚C 0011 1110 1000 0111 3E 87h +25˚C 0000 1100 1000 0111 0C 87h +0.0625˚C 0000 0000 0000 1111 00 0Fh 0˚C 0000 0000 0000 0111 00 07h −0.0625˚C 1111 1111 1111 1111 FF FFh −25˚C 1111 0011 1000 0111 F3 87h −55˚C 1110 0100 1000 0111 E4 87h Note: The last two bits are TRI-STATE ® and depicted as one in the table. The first data byte is the most significant byte with most significant bit first, permitting only as much data as necessary to be read to determine temperature condition. For instance, if the first four bits of the temperature data indicate an overtemperature condition, the host processor could immediately take action to remedy the excessive temperatures. • 01 hex • 03 hex • 07 hex • 0F hex • 1F hex • 3F hex • 7F hex • FF hex any others may place the part into a Test Mode. Test Modes are used by National Semiconductor to thoroughly test the function of the LM74 during production testing. Only eight bits have been defined above since only the last eight transmitted are detected by the LM74, before CS is taken HIGH. The following communication can be used to determine the Manufacturer’s/Device ID and then immediately place the part into continuous conversion mode. With CS continuously low: • Read 16 bits of temperature data • Write 16 bits of data commanding shutdown • Read 16 bits of Manufacture’s/Device ID data • Write 8 to 16 bits of data commanding Conversion Mode • Take CS HIGH. 1.4 SHUTDOWN MODE/MANUFACTURER’S ID Shutdown mode is enabled by writing XX FF to the LM74 as shown in Figure 7c. The serial bus is still active when the LM74 is in shutdown. Current draw drops to less than 10 µA between serial communications. When in shutdown mode the LM74 always will output 1000 0000 0000 00XX. This is the manufacturer’s/Device ID information. The first 5-bits of the field (1000 0XXX) are reserved for manufacturer’s ID. As mentioned in Section 1.2, writing a zero to the LM74 configuration register will take it out of shutdown mode and place it in conversion mode. In other words, any valid code listed in Section 1.2 other than XX FF will put it in conversion mode. After leaving shutdown, but before the first temperature conversion is complete, the temperature register will contain the last measured temperature which resided in the temperature register before entering shutdown mode. After the completion of the first conversion, the temperature register will be updated with the new temperature data. 9 www.national.com LM74 1.0 Functional Description LM74 1.0 Functional Description (Continued) 1.5 INTERNAL REGISTER STRUCTURE The LM74 has three registers, the temperature register, the configuration register and the manufacturer’s/device identification register. The temperature and manufacturer’s/device identification registers are read only. The configuration register is write only. 1.5.1 Configuration Register (Selects shutdown or continuous conversion modes): (Write Only): D15 D14 D13 D12 D11 D10 D9 D8 X X X X X X X X D7 D6 D5 D4 D3 D2 D1 D0 Shutdown D0–D15 set to XX FF hex enables shutdown mode. D0–D15 set to 00 00 hex sets Continuous conversion mode. Note: setting D0-D15 to any other values may place the LM74 into a manufacturer’s test mode, upon which the LM74 will stop responding as described. These test modes are to be used for National Semiconductor production testing only. See Section 1.2 Serial Bus Interface for a complete discussion. 1.5.2 Temperature Register (after power-up, before first complete temperature conversion) (Read Only): D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 X X D0–D1: Undefined. TRI-STATE will be output on SI/0. D2–D15: Power-on Reset (POR) values. 1.5.3 Temperature Register (after completion of first temperature conversion) (Read Only): D15 MSB D14 D13 Bit 11 Bit 10 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 LSB 1 X X D0–D1: Undefined. TRI-STATE will be output on SI/0. D2: High. D3–D15: Temperature Data. One LSB = 0.0625˚C. Two’s complement format. 1.5.4 Manufacturer’s Device ID Register (Read Only): D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 X X D0–D1: Undefined. TRI-STATE will be output on SI/0. D2–D15: Manufacturer’s/Device ID Data. This register is accessed whenever the LM74 is in shutdown mode. www.national.com 10 LM74 2.0 Serial Bus Timing Diagrams 10090914 a) Reading Continuous Conversion - Single Eight-Bit Frame 10090915 b) Reading Continuous Conversion - Two Eight-Bit Frames 10090918 c) Writing Shutdown Control FIGURE 7. Timing Diagrams 11 www.national.com LM74 where condensation can occur. Printed-circuit coatings and varnishes such as Humiseal and epoxy paints or dips are often used to insure that moisture cannot corrode the LM74 or its connections. 3.0 Application Hints To get the expected results when measuring temperature with an integrated circuit temperature sensor like the LM74, it is important to understand that the sensor measures its own die temperature. For the LM74, the best thermal path between the die and the outside world is through the LM74’s pins. In the SO-8 package all the pins on the LM74 will have an equal effect on the die temperature. Because the pins represent a good thermal path to the LM74 die, the LM74 will provide an accurate measurement of the temperature of the printed circuit board on which it is mounted. There is a less efficient thermal path between the plastic package and the LM74 die. If the ambient air temperature is significantly different from the printed circuit board temperature, it will have a small effect on the measured temperature. 3.1 micro SMD LIGHT SENSITIVITY The LM74 in the micro SMD package should not be exposed to ultraviolet light. The micro SMD package does not completely encapsulate the LM74 die in epoxy. Exposing the LM74 micro SMD package to bright sunlight will not immediatly cause a change in the output reading. Our experiments show that directly exposing the circuit side (bump side) of the die to high intensity (≥ 1mW/cm2) ultraviolet light, centered at a wavelength of 254nm, for greater than 20 minutes will deprogram the EEPROM cells in the LM74. Since the EEPROM is used for storing calibration coefficients, the LM74 will function but the temperature accuracy will no longer be as specified. Light can penetrate through the side of the package as well, so exposure to ultra violet radiation is not recommended even after mounting. In probe-type applications, the LM74 can be mounted inside a sealed-end metal tube, and can then be dipped into a bath or screwed into a threaded hole in a tank. As with any IC, the LM74 and accompanying wiring and circuits must be kept insulated and dry, to avoid leakage and corrosion. This is especially true if the circuit may operate at cold temperatures 4.0 Typical Applications 10090920 FIGURE 8. Temperature monitor using Intel 196 processor www.national.com 12 LM74 4.0 Typical Applications (Continued) 10090919 FIGURE 9. LM74 digital input control using micro-controller’s general purpose I/O. 13 www.national.com LM74 Physical Dimensions inches (millimeters) unless otherwise noted 8-Lead Molded Small Outline Package Order Number LM74CIM-3, LM74CIMX-3, LM74CIM-5 or LM74CIMX-5 NS Package Number M08A 5-Bump micro SMD Ball Grid Array Package Order Number LM74CIBP-3,LM74CIBPX-3, LM74CIBP-5, LM74CIBPX-5 NS Package Number BPD05MPB The following dimensions apply to the BPD05MPB package shown above: X1=1565µm ± 30µm, X2=1615µm ± 30µm, X3=850µm ± 50µm. www.national.com 14 LM74 SPI/MICROWIRE 12-Bit Plus Sign Temperature Sensor Notes 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 certifies that the products and packing materials 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. National Semiconductor Americas Customer Support Center Email: [email protected] Tel: 1-800-272-9959 www.national.com National Semiconductor Europe Customer Support Center Fax: +49 (0) 180-530 85 86 Email: [email protected] 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: [email protected] National Semiconductor Japan Customer Support Center Fax: 81-3-5639-7507 Email: [email protected] Tel: 81-3-5639-7560 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.