UPD17207GF datasheet(13/120 Pages) NEC

Part #	UPD17207GF

Description	4-BIT SINGLE-CHIP MICROCONTROLLER WITH LCD CONTROLLER/DRIVER AND A/D CONVERTER FOR INFRARED REMOTE CONTROL TRANSMITTERS

PDF	120 Pages

Scroll/Zoom	100%

Manufacturer	NEC [NEC]

Direct Link	http://www.nec.com/

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13 / 120 page

µPD17201A, 17207

3.4

NOTES ON USING RESET AND INT PINS

In addition to the functions shown in 3.1 PIN IDENTIFICATION, the RESET and INT pins also have a function

to set a test mode (for IC testing) in which the internal operations of the

µPD17207are tested.

When a voltage higher than VDD is applied to either of these pins, the test mode is set. This means that, even during

ordinary operation, the

µPD17207 may be set in the test mode if a noise exceeding VDD is applied.

For example, if the wiring length of the RESET or INT pin is too long, noise superimposed on the wiring line of the

pin may cause the above problem.

Therefore, keep the wiring length of these pins as short as possible to suppress the noise; otherwise, take noise

preventive measures as shown below by using external components.

• Connect diode with low VF between VDD

•

Connect capacitor between VDD

and RESET/INT pin

VDD

RESET, INT

Diode with

low VF

RESET, INT

UPD17207GF Datasheet(PDF) 13 Page - NEC