MB96F348CSAPMC-GE2 datasheet(56/159 Pages) FUJITSU

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MB96300 Series

Preliminary Speciﬁcation

FME/EMDC- 2007-02-12

MB96300_shortspec.fm

•

Connect VCC and VSS to the device from the power supply with lowest possible impedance.

•

As a measure against power supply noise, connect a capacitor of about 0.1

µF as a bypass capacitor

between VCC and VSS as close as possible to VCC and VSS pins.

Crystal Oscillator Circuit

•

Noise at X0 or X1 pins may possibly cause abnormal operation. Make sure to provide bypass capacitors with

shortest distance to X0, X1 pins, crystal oscillator (or ceramic resonator) and ground lines, and make sure, to

the utmost effort, that lines of oscillation circuit not cross the lines of other circuits.

•

It is highly recommended to provide a printed circuit board art work surrounding X0 and X1 pins with a ground

area for stabilizing the operation.

Turning-on Sequence of Power Supply to A/D Converter and Analog Inputs

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Make sure to turn on the A/D converter power supply (AVCC, AVRH, AVRL) and analog inputs (ANn) after

turning-on the digital power supply (VCC).

•

Turn-off the digital power after turning off the A/D converter supply and analog inputs. In this case, make sure

that the voltage does not exceed AVRH or AVCC (turning on/off the analog and digital power supplies

simultaneously is acceptable).

Connection of Unused Pins of A/D Converter

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Connect unused pins of A/D converter as AVCC = VCC, AVSS = AVRH = AVRL = VSS.

10. Notes on Energization

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To prevent malfunction of the internal voltage regulator, supply voltage profile while turning on the power

supply should be slower than 50us from 0.2 V to 2.7 V.

11. Stabilization of power supply voltage

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If the power supply voltage varies acutely even within the operation assurance range of the Vcc power supply

voltage, a malfunction may occur. The Vcc power supply voltage must therefore be stabilized. As stabilization

guidelines, stabilize the power supply voltage so that Vcc ripple fluctuations (peak to peak value) in the

commercial frequencies (50 to 60 Hz) fall within 10% of the standard Vcc power supply voltage and the

transient fluctuation rate becomes 0.1V/

µs or less in instantaneous fluctuation for power supply switching.

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