mb95f118awpv2 Fujitsu Microelectronics, Inc., mb95f118awpv2 Datasheet - Page 14

• Manufacturer Part Number: mb95f118awpv2
• Description: 8-bit Proprietary Microcontrollers
• Manufacturer: Fujitsu Microelectronics, Inc.

14
MB95110A Series
• Preventing Latch-up
• Stable Supply Voltage
• Precautions for Use of External Clock
• Treatment of Unused Input Pin
• Treatment of Power Supply Pins on A/D Converter
• Power Supply Pins
HANDLING DEVICES
Care must be taken to ensure that maximum voltage ratings are not exceeded when they are used.
Latch-up may occur on CMOS ICs if voltage higher than V
other than medium- and high-withstand voltage pins or if higher than the rating voltage is applied between V
pin and V
When latch-up occurs, power supply current increases rapidly and might thermally damage elements.
Also, take care to prevent the analog power supply voltage (AV
digital power supply voltage (V
Supply voltage should be stabilized.
A sudden change in power-supply voltage may cause a malfunction even within the guaranteed operating range
of the V
For stabilization, in principle, keep the variation in V
(50 Hz/60 Hz) not to exceed 10% of the standard V
transient variation rate does not exceed 0.1 V/ms during a momentary change such as when the power supply
is switched.
Even when an external clock is used, oscillation stabilization wait time is required for power-on reset, wake-up
from subclock mode or stop mode.
PIN CONNECTION
Leaving unused input pins unconnected can cause abnormal operation or latch-up, leaving to permanent
damage. Unused input pins should always be pulled up or down through resistance of at least 2 kΩ.
Any unused input/output pins may be set to output mode and left open, or set to input mode and treated the
same as unused input pins. If there is unused output pin, make it to open.
Connect to be AV
Noise riding on the AV
as a bypass capacitor between AV
In products with multiple V
to avoid abnormal operations including latch-up. However, you must connect the pins to external power supply
and a ground line to lower the electro-magnetic emission level, to prevent abnormal operation of strobe signals
caused by the rise in the ground level, and to conform to the total output current rating.
Moreover, connect the current supply source with the V
It is also advisable to connect a ceramic capacitor of approximately 0.1 µF as a bypass capacitor between V
and V
SS
CC
pins near this device.
SS
power-supply voltage.
pin.
CC
= V
CC
CC
pin may cause accuracy degradation. So, connect approx. 0.1 µF ceramic capacitor
and AV
CC
or V
CC
) when the analog system power supply is turned on or off.
SS
SS
CC
= V
pins, the pins of the same potential are internally connected in the device
and AV
SS
even if the A/D converter is not in use.
SS
pins in the vicinity of this device.
CC
CC
ripple (p-p value) in a commercial frequency range
CC
value and suppress the voltage variation so that the
CC
and V
or lower than V
CC
SS
) and analog input voltage from exceeding the
pins of this device at the low impedance.
SS
is applied to input and output pins
CC
CC