ST92T163 ST Microelectronics, ST92T163 Datasheet - Page 218

• Manufacturer Part Number: ST92T163
• Description: 8/16-BIT FULL SPEED USB MCU FOR COMPOSITE DEVICES WITH 16 ENDPOINTS
• Manufacturer: ST Microelectronics

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-
218/224
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.