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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST92163 датащи(PDF) 218 Page - STMicroelectronics |
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ST92163 датащи(HTML) 218 Page - STMicroelectronics |
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218 / 224 page  218/224 ST92163 - GENERAL INFORMATION 10 GENERAL INFORMATION 10.1 EPROM/OTP PROGRAMMING The 20 Kbytes of EPROM/OTP of the ST92E163/ ST92T163 may be programmed using the EPROM programming boards available from STMicroelectronics. EPROM Erasing The EPROM of the windowed package of the ST92E163 can be erased by exposure to Ultra-Vi- olet light. The erasure characteristic of the ST92E163 is such that erasure begins when the memory is ex- posed to light with wave lengths shorter than ap- proximately 4000Å. It should be noted that sunlight and some types of fluorescent lamps have wave- lengths in the range 3000-4000Å. It is recom- mended to cover the window of the ST92E163 packages by an opaque label to prevent uninten- tional erasure problems when testing the applica- tion in such an environment. The recommended erasure procedure of the EPROM is the exposure to short wave ultraviolet light which have a wave-length 2537Å. The inte- grated dose (i.e. U.V. intensity x exposure time) for erasure should be a minimum of 15W-sec/cm2. The erasure time with this dosage is approximate- ly 30 minutes using an ultraviolet lamp with a 12000 mW/cm2 power rating. The device should be placed within 2.5 cm (1 inch) of the lamp tubes during erasure. |
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