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MB90387 Datasheet(PDF) 12 Page - Cypress Semiconductor |
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MB90387 Datasheet(HTML) 12 Page - Cypress Semiconductor |
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12 / 82 page  Document Number: 002-07765 Rev. *A Page 11 of 81 MB90387/387S/F387/F387S MB90V495G Notes When Using No Sub Clock ■ If an oscillator is not connected to X0A and X1A pin, apply pull-down resistor to X0A pin and leave X1A pin open. About Power Supply Pins ■ If two or more Vcc and Vss pins exist, the pins that should be at the same potential are connected to each other inside the device. For reducing unwanted emissions and preventing malfunction of strobe signals caused by increase of ground level, however, be sure to connect the Vcc and Vss pins to the power source and the ground externally. ■ Pay attention to connect a power supply to Vcc and Vss of MB90385 series device in a lowest-possible impedance. ■ Near pins of MB90385 series device, connecting a bypass capacitor is recommended at 0.1 F across Vcc pin and Vss pin. Crystal Oscillator Circuit ■ Noises around X0 and X1 pins cause malfunctions on a MB90385 series device. Design a print circuit so that X0 and X1 pins, an crystal oscillator (or a ceramic oscillator), and bypass capacitor to the ground become as close as possible to each other. Furthermore, avoid wires to X0 and X1 pins crossing each other as much as possible. ■ Print circuit designing that surrounds X0 and X1 pins with grounding wires, which ensures stable operation, is strongly recommended. Caution on Operations during PLL Clock Mode ■ If the PLL clock mode is selected, the microcontroller attempt to be working with the self-oscillating circuit even when there is no external oscillator or external clock input is stopped. Performance of this operation, however, cannot be guaranteed. Sequence of Turning on Power of A/D Converter and Applying Analog Input ■ Be sure to turn on digital power (Vcc) before applying signals to the A/D converter and applying analog input signals (AN0 to AN7 pins). ■ Be sure to turn off the power of A/D converter and analog input before turning off the digital power source. ■ Be sure not to apply AVR exceeding AVcc when turning on and off. (No problems occur if analog and digital power is turned on and off simultaneously.) Handling Pins When A/D Converter is Not Used ■ If the A/D converter is not used, connect the pins under the following conditions: “AVcc=AVR=Vcc,” and “AVss=Vss” Note on Turning on Power ■ For preventing malfunctions on built-in step-down circuit, maintain a minimum of 50 s of voltage rising time (between 0.2 V and 2.7V) when turning on the power. Stabilization of Supply Voltage ■ A sudden change in the supply voltage may cause the device to malfunction even within the specified 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. |
Similar Part No. - MB90387 |
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Similar Description - MB90387 |
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