MB90822 데이터 시트보기 (PDF) - Fujitsu

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MB90822

16-bit Proprietary Microcontroller

Fujitsu 

MB90820 Series

■ HANDLING DEVICES

Special care is required for the following when handling the device :

• Preventing latch-up

• Stabilization of supply voltage

• Treatment of unused pins

• Using external clock

• Power supply pins (VCC /VSS )

• Pull-up/pull-down resistors

• Crystal Oscillator Circuit

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

• Connection of Unused Pins of A/D Converter and D/A Converter if A/D Converter and D/A Converter are unused

• Notes on energization

• Notes on During Operation of PLL Clock Mode

1. Preventing latch-up

CMOS IC chips may suffer latch-up under the following conditions :

• A voltage higher than VCC or lower than VSS is applied to an input or output pin.

• A voltage higher than the rated voltage is applied between VCC and VSS.

• The AVCC power supply is applied before the VCC voltage.

Latch-up may increase the power supply current drastically, causing thermal damage to the device.

In using the devices, take sufficient care to avoid exceeding maximum ratings.

For the same reason, also be careful not to let the analog power-supply voltage (AVCC, AVR) exceed the digital

power-supply voltage.

2. Stabilization of supply voltage

A sudden change in the supply voltage may cause the device to malfunction even within the specified VCC supply

voltage operation 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 to 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.

3. Treatment of unused pins

Leaving unused input pins open may result in misbehavior or latch up and possible permanent damage of the

device. Therefore they must be pulled up or pulled down through resistors. In this case those resistors should

be more than 2 kΩ.

Unused bidirectional pins should be set to the output state and can be left open, or the input state with the above

described connection.

4. Using external clock

To use external clock, drive the X0 pin and leave X1 pin open.

MB90820 series

X0

Open

X1

15

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