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L4902A Datasheet(PDF) 6 Page - STMicroelectronics |
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L4902A Datasheet(HTML) 6 Page - STMicroelectronics |
6 / 9 page Configurations of this type are used in products where the OFF switch is part of a keyboard scanned by a micro which operates continuously even in the OFF state. Another application for the L4902A is supplying a shadow-ram microcomputer chip (SGS M38SH72 for example)where a fast NV memory is backed up on chip by a EEPROM when a low level on the reset output occurs. By adding two CMOS-SCHMIDT-TRIGGER and few external components, also a watch dog func- tion may be realized (see Figure 5). During normal operation the microsystem supplies a periodical pulse waveform;if an anomalousconditionoccours (in the program or in the system), the pulses will be absent and the disable input will be activated after a settling time determined by R1 C1. In this condi- tion all the circuitry connected to V02 will be dis- abled, the system will be restarted with a new reset front. The disable of V02 prevent spurious operation dur- ing microprocessor malfunctioning. Figure 4 Figure 5 L4902A 6/9 |
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