參數(shù)資料
型號(hào)： MB90925
廠商： Fujitsu Limited
英文描述： 16-bit Microcontrolle
中文描述： 16位Microcontrolle
文件頁數(shù)： 14/63頁
文件大?。?/td> 941K
代理商： MB90925
MB90925 Series
14
■
HANDLING DEVICES
Strictly observe maximum rated voltages (preventing latch-up)
In CMOS IC devices, a condition known as latch-up may occur if voltages higher than V
CC
or lower than V
SS
are
applied to input or output pins other than medium-or high-voltage pins, or if the voltage applied between V
CC
and
V
SS
exceeds the rated voltage level. In a latch-up condition, the power supply current can increase dramatically
and may destroy semiconductor elements. In using semiconductor devices, always take sufficient care to avoid
exceeding maximum ratings.
Also care must be taken when the analog system power supply is switched on or off to ensure that the analog
power supply (AV
CC
, AVRH) , the analog input voltages and the power supply voltage for the high current output
buffer pins (DV
CC
) do not exceed the digital power supply voltage (V
CC
) .
Once the digital power supply voltage (V
CC
) has been disconnected, the analog power supply (AV
CC
, AVRH) and
the power supply voltage for the high current output buffer pins (DV
CC
) may be turned on in any sequence.
Stable supply voltage
Even within the warranted operating range of V
CC
power supply voltage, rapid fluctuations in the power supply
voltage can cause malfunctions. The recommended stability for ripple fluctuations (P-P value) at commercial
frequencies (50 Hz/60 Hz) should be within 10
%
of the standard V
CC
value, and voltage fluctuations that occur
during switching of power supplies etc. should be limited to transient fluctuation rates of 0.1 V/ms or less.
Notes on energization Power-on procedures
In order to prevent the built-in step-down circuits from malfunctioning, the voltage rising time (0.2 V to 2.7 V)
during power-on should be attained within 50
μ
s.
Treatment of unused pins
If unused input pins are left open, they may cause malfunctions or latch-up which may lead to permanent damage
to the semiconductor. Unused input pins should therefore be pulled up or pulled down through a resistor of at
least 2 k
.
Any unused input/output pins should be left open in output status, or if found set to input status, they should be
treated in the same way as input pins.
Treatment of A/D converter power supply pins
Even if the A/D converter is not used, pins should be connected so that AV
CC
=
V
CC
, and AV
SS
=
AVRH
=
V
SS
.
Notes on Using an external clock
Even when an external clock is used, an oscillation stabilization wait time is required following power-on reset
or release from sub clock mode or stop mode. Also, when an external clock is used, it should drive only the X0
pin and the X1 pin should be left open, as shown below.
X0
X1
OPEN
MB90925 Series
Sample external clock connection
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