ST62T55C datasheet(15/86 Pages) STMICROELECTRONICS

Part #	ST62T55C

Description	8-BIT OTP/EPROM MCUs WITH A/D CONVERTER, SAFE RESET, AUTO-RELOAD TIMER, EEPROM AND SPI

PDF	86 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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15 / 86 page

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ST62T55C ST62T65C/E65C

PROGRAMMING MODES (Cont’d)

1.4.2 EPROM Erasing

The EPROM of the windowed package of the

MCUs may be erased by exposure to Ultra Violet

light. The erasure characteristic of the MCUs is

such that erasure begins when the memory is ex-

posed to light with a wave lengths shorter than ap-

proximately 4000Å. It should be noted that sun-

lights and some types of fluorescent lamps have

wavelengths in the range 3000-4000Å.

It is thus recommended that the window of the

MCUs packages be covered by an opaque label to

prevent unintentional erasure problems when test-

ing the application in such an environment.

The recommended erasure procedure of the

MCUs EPROM is the exposure to short wave ul-

traviolet light which have a wave-length 2537A.

The integrated 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 ap-

proximately 15 to 20 minutes using an ultraviolet

lamp with 12000

µW/cm2 power rating. The

ST62E65C should be placed within 2.5cm (1Inch)

of the lamp tubes during erasure.

ST62T55C Datasheet(PDF) 15 Page - STMicroelectronics