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LM74A Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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LM74A Datasheet(HTML) 11 Page - National Semiconductor (TI) |
11 / 12 page 3.0 Application Hints 3.1 LIGHT SENSITIVITY The LM74A in die form should not be exposed to ultraviolet light. Exposing the LM74A to bright sunlight will not immedi- atly cause a change in the output reading. Our experiments show that directly exposing the circuit side (pad 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 LM74A. Since the EEPROM is used for storing calibration coefficients, the LM74A will function but the temperature accuracy will no longer be as specified. Light can penetrate through the side of the die as well. 4.0 Typical Applications 20017720 FIGURE 8. Temperature monitor using Intel 196 processor 20017719 FIGURE 9. LM74A digital input control using micro-controller’s general purpose I/O. www.national.com 11 |
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