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MB90800 Datasheet(PDF) 15 Page - Fujitsu Component Limited. |
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MB90800 Datasheet(HTML) 15 Page - Fujitsu Component Limited. |
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15 / 92 page  MB90800 Series DS07-13733-6E 15 5. Treatment of power supply pins (VCC/VSS) In products with multiple VCC or VSS pins, the pins of the same potential are internally connected in the device to avoid abnormal operations including latch-up. However, you must connect all power supply pins to external power supply and a ground line to lower the electro-magnetic emission level, to prevent abnormal operation of strobe signals caused by the rise in the ground level, and to conform to the total output current rating. Moreover, connect the current supply source with the VCC and VSS pins of this device at the low impedance. It is also advisable to connect a ceramic capacitor of approximately 0.1 μF as a bypass capacitor between VCC and VSS near this device. 6. About Crystal oscillators circuit Noise near the X0/X1 pins and X0A/X1A pins may cause the device to malfunction. Design the printed circuit board so that X0/X1 pins and X0A/X1A pins, the crystal oscillator (or the ceramic oscillator) and the bypass capacitor to ground are located as close to the device as possible. It is strongly recommended to design the PC board artwork with the X0/X1 pins and X0A/X1A pins surrounded by ground plane because stable operation can be expected with such a layout. Please ask the crystal maker to evaluate the oscillational characteristics of the crystal and this device. 7. Caution on Operations during PLL Clock Mode On this microcontroller, if in case the crystal oscillator breaks off or an external reference clock input stops while the PLL clock mode is selected, a self-oscillator circuit contained in the PLL may continue its operation at its self-running frequency. However, Fujitsu will not guarantee results of operations if such failure occurs. 8. Stabilization of Supply Power Supply A sudden change in the supply voltage may cause the device to malfunction even within the VCC supply voltage operating range.Therefore, the VCC supply voltage should be stabilized. For reference, the supply voltage should be controlled so that VCC ripple variations (peak- to-peak values) at commercial frequencies (50 Hz/60 Hz) fall below 10 % of the standard VCC supply voltage and the coefficient of fluctuation does not exceed 0.1 V/ms at instantaneous power switching. 9. Note on Using the two-subsystem product as one-subsystem product If you are using only one subsystem of the MB90800 series that come in one two-subsystem product, use it with X0A = VSS and X1A = OPEN. 10. Write to FLASH Ensure that you must write to FLASH at the operating voltage VCC = 3.0 V to 3.6 V. |
Similar Part No. - MB90800_09 |
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Similar Description - MB90800_09 |
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