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UPD17072 датащи(PDF) 19 Page - NEC

номер детали UPD17072
подробное описание детали  4-BIT SINGLE-CHIP MICROCONTROLLER WITH HARDWARE FOR DIGITAL TUNING SYSTEM
PDF  226 Pages
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производитель  NEC [NEC]
домашняя страница  http://www.nec.com/
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UPD17072 датащи(HTML) 19 Page - NEC

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µPD17072,17073
1.4 Notes on Using CE Pin
The CE pin has a function to set a test mode in which the internal operations of the
µPD17073 are tested (dedicated
to IC test), in addition to the functions listed in 1.1 Pin Function List.
When a voltage higher than VDD is applied to the CE pin, the test mode is set. This means that if noise exceeding
VDD is applied to the CE pin even during normal operation, the test mode is set, affecting the normal operation.
If the wiring of the CE pin is too long, the above problem occurs because wiring noise is superimposed on the CE
pin.
Therefore, wire the CE pin with as short a wiring length as possible to suppress noise. If noise cannot be avoided,
use external components as shown below to suppress noise.
• Connect a diode with low VF between CE and VDD
• Connect a capacitor between CE and VDD
VDD
CE
VDD
Diode with
low VF
VDD
CE
VDD



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