mb95f108bspfv Fujitsu Microelectronics, Inc., mb95f108bspfv Datasheet - Page 14

• Manufacturer Part Number: mb95f108bspfv
• Description: 8-bit Proprietary Microcontrollers
• Manufacturer: Fujitsu Microelectronics, Inc.

14
MB95100B Series
I HANDLING DEVICES
• Preventing Latch-up
• Stable Supply Voltage
• Precautions for Use of External Clock
I PIN CONNECTION
• Treatment of Unused Pin
• Treatment of Power Supply Pins on A/D Converter
• Power Supply Pins
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
the 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
(50/60 Hz) not to exceed 10% of the standard V
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 sub clock mode or stop mode.
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 an unused output pin, make it 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 bypass capacitor of approximately 0.1 µF between V
near this device.
CC
SS
power-supply voltage.
pins.
CC
= V
CC
CC
pin may cause accuracy degradation. So, connect approx. 0.1 µF ceramic capacitor
and AV
CC
or V
SS
SS
CC
CC
= AVR = V
pins, the pins of the same potential are internally connected in the device
) when the analog system power supply is turned on or off.
and AV
SS
SS
pins in the vicinity of this device.
CC
even if the A/D converter is not in use.
value and suppress the voltage variation so that the transient
CC
ripple (p-p value) in a commercial frequency range
CC
CC
and V
or lower than V
CC
, AVR) and analog input voltage from exceeding
SS
pins of this device at the low impedance.
SS
is applied to input and output pins
CC
and V
SS
pins
CC