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參數(shù)資料
| 型號： | MB90F823A |
| 廠商： | Fujitsu Limited |
| 英文描述： | 16-bit Proprietary Microcontroller |
| 中文描述： | 16位微控制器專有 |
| 文件頁數(shù)： | 15/100頁 |
| 文件大小： | 992K |
| 代理商： | MB90F823A |
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MB90820 Series
15
■
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 (V
CC
/V
SS
)
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 V
CC
or lower than V
SS
is applied to an input or output pin.
A voltage higher than the rated voltage is applied between V
CC
and V
SS
.
The AV
CC
power supply is applied before the V
CC
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 (AV
CC
, AVR) exceed the digital
power-supply voltage.
Stabilization of supply voltage
2.
A sudden change in the supply voltage may cause the device to malfunction even within the specified V
CC
supply
voltage operation range. Therefore, the V
CC
supply voltage should be stabilized.
For reference, the supply voltage should be controlled so that V
CC
ripple variations (peak-to-peak values) at
commercial frequencies (50 Hz to 60 Hz) fall below 10
%
of the standard V
CC
supply voltage and the coefficient
of fluctuation does not exceed 0.1 V/ms at instantaneous power switching.
Treatment of unused pins
3.
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 k
.
Unused bidirectional pins should be set to the output state and can be left open, or the input state with the above
described connection.
Using external clock
4.
To use external clock, drive the X0 pin and leave X1 pin open.
X0
X1
MB90820 series
Open
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