ST62T42B Datasheet, PDF (66/68 Pages) STMicroelectronics – 8-BIT OTP/EPROM MCU WITH LCD DRIVER, EEPROM AND A/D CONVERTER

ST6242B
1 GENERAL DESCRIPTION
1.1 INTRODUCTION
The ST6242B is mask programmed ROM version
of ST62T42B OTP devices.
It offers the same functionality as OTP devices,
selecting as ROM options the options defined in
the programmable option byte of the OTP version.
1.2 ROM READOUT PROTECTION
If the ROM READOUT PROTECTION option is
selected, a protection fuse can be blown to pre-
vent any access to the program memory content.
In case the user wants to blow this fuse, high volt-
age must be applied on the TEST pin.
Figure 1. Programming wave form
Figure 2. Programming Circuit
TEST
15
14V typ
10
5
TEST
100mA
max
4mA typ
0.5s min
150 µs typ
t
VR02001
5V 47mF
100nF
V_SS
V_DD
TEST
100nF
PROTECT
14V
ZPD15
15V
VR02003
Note: ZPD15 is used for overvoltage protection
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