lm74a-5-mda National Semiconductor Corporation, lm74a-5-mda Datasheet - Page 11

• Manufacturer Part Number: lm74a-5-mda
• Description: Spi/microwire 12-bit Plus Sign Temperature Sensor Lm74 In Die Form
• Manufacturer: National Semiconductor Corporation

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/cm
4.0 Typical Applications
FIGURE 9. LM74A digital input control using micro-controller’s general purpose I/O.
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) ultraviolet light, centered at
FIGURE 8. Temperature monitor using Intel 196 processor
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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.
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