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UPD75402A Datasheet(PDF) 11 Page - NEC |
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UPD75402A Datasheet(HTML) 11 Page - NEC |
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11 / 48 page  11 µPD75402A(A) 3.5 HANDLING UNUSED PINS Recommended connection method Connected to the VSS pin • When a pull-up resistor is contained Connected to the VDD pin • When a pull-up resistor is not contained Connected to the VSS or VDD pin • When a pull-up resistor is contained Input mode : Connected to the VDD pin Output mode : Open • When a pull-up resistor is not contained Input mode : Connected to the VSS or VDD pin Output mode : Open Open or directly connected to the VSS pin Note Pin P00 P01 - P03 P10, P12 P20 - P23 P30 - P33 P50 - P53 P60 - P63 NC • Connect a capacitor between the pin and VDD. Note When the µPD75402A(A) shares the printed circuit board with the µPD75P402, connect the NC pin directly to VSS pin. 3.6 NOTES ON USING THE P00 AND RESET PINS The P00 and RESET pins have the test mode selecting function for testing the internal operation of the µPD75402A(A) (IC test), besides the functions shown in Sections 3.1 and 3.2. Applying a voltage exceeding VDD to the P00 and/or RESET pin causes the µPD75402A(A) to enter the test mode. When noise exceeding VDD comes in during normal operation, the device is switched to the test mode. For example, when the wiring from the P00 or RESET pin is too long, noise voltage induced on the wiring is applied to the pin, driving the voltage at the pin above VDD, which may cause malfunction. When installing the wiring, lay the wiring in such a way that noise is suppressed as much as possible. If noise yet arises, use an external part to suppress it as shown below. • Connect a diode with low VF (0.3 V or lower) between the pin and VDD. VDD P00, RESET VDD VDD P00, RESET VDD Diode with low VF |
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Similar Description - UPD75402A |
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