ST72E632K2B0 データシートの表示（PDF） - STMicroelectronics

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ST72E632K2B0

LOW SPEED USB 8-BIT MCU FAMILY with up to 16K MEMORY, up to 512 BYTES RAM, 8-BIT ADC, WDG, TIMER, SCI & I2C

STMicroelectronics 

ST7263

1.5 EPROM/OTP PROGRAM MEMORY

The program memory of the ST72T63 may be pro-

grammed using the EPROM programming boards

available from STMicroelectronics (see Table 26).

1.5.1 EPROM ERASURE

ST72Exxx EPROM devices are erased by expo-

sure to high intensity UV light admitted through the

transparent window. This exposure discharges the

floating gate to its initial state through induced

photo current.

It is recommended that the ST72Exxx devices be

kept out of direct sunlight, since the UV content of

sunlight can be sufficient to cause functional fail-

ure. Extended exposure to room level fluorescent

lighting may also cause erasure.

An opaque coating (paint, tape, label, etc...)

should be placed over the package window if the

product is to be operated under these lighting con-

ditions. Covering the window also reduces IDD in

power-saving modes due to photo-diode leakage

currents.

An Ultraviolet source of wave length 2537 Å yield-

ing a total integrated dosage of 15 Watt-sec/cm2 is

required to erase the ST72Exxx. The device will

be erased in 15 to 30 minutes if such a UV lamp

with a 12mW/cm2 power rating is placed 1 inch

from the device window without any interposed fil-

ters.

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