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ST52T400 Datasheet(PDF) 36 Page - STMicroelectronics

Part # ST52T400
Description  8-BIT INTELLIGENT CONTROLLER UNIT ICU Timer/PWM, Analog Comparator, Triac/PWM Timer, WDG
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST52T400 Datasheet(HTML) 36 Page - STMicroelectronics

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3.1.5 Stand by Mode. EPROM has a standby
mode which reduces the active current from 10mA
(Programming mode) to less than 100
µA. Mem-
ory is placed in standby mode by setting PHASE
signal at high level or when the EPROM Control
Register value is 0 and PHASE signal is low.
3.1.6 ID code. A software identification code,
called ID code may be written to distinguish which
software version is stored in the memory.
64 Bytes are dedicated to store this code by using
the address values from 0 to 63.
The ID Code may be read or verified even if the
Memory Lock Status is “0".
The signals timing is the same as that of a normal
operation.
3.2 Eprom Erasure
Thanks to the transparent window available in the
CDIP28W package, its memory contents may be
erased by exposure to UV light.
Erasure begins when the device is exposed to
light with a wavelength shorter than 4000Å. It
should be noted that sunlight, as well as some
types of artificial light, includes wavelengths in the
3000-4000Å range which, on prolonged exposure,
can cause erasure of memory contents. It is thus
recommended that EPROM devices be fitted with
an opaque label over the window area in order to
prevent unintentional erasure.
The recommended erasure procedure for EPROM
devices consists of exposure to short wave UV
light having a wavelength of 2537Å. The minimum
recommended integrated dose (intensity x expo-
sure time) for complete erasure is 15Wsec/cm2.
This is equivalent to an erasure time of 5-10 min-
utes using a UV source having an intensity of
12mW/cm2 at a distance of 25mm (1 inch) from
the device window.


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