Document Number: 002-04721 Rev.*A
Page 36 of 74
MB966B0 Series
*4: Applicable to all general purpose I/O pins (Pnn_m).
• Use within recommended operating conditions.
• Use at DC voltage (current).
• The +B signal should always be applied a limiting resistance placed between the +B signal and the microcontroller.
• The value of the limiting resistance should be set so that when the +B signal is applied the input current to the microcontroller
pin does not exceed rated values, either instantaneously or for prolonged periods.
• Note that when the microcontroller drive current is low, such as in the power saving modes, the +B input potential may pass
through the protective diode and increase the potential at the VCC pin, and this may affect other devices.
• Note that if a +B signal is input when the microcontroller power supply is off (not fixed at 0V), the power supply is provided
from the pins, so that incomplete operation may result.
• Note that if the +B input is applied during power-on, the power supply is provided from the pins and the resulting supply
voltage may not be sufficient to operate the Power reset.
• The DEBUG I/F pin has only a protective diode against VSS. Hence it is only permitted to input a negative clamping current
(4mA). For protection against positive input voltages, use an external clamping diode which limits the input voltage to
maximum 6.0V.
• Sample recommended circuits:
*5: The maximum permitted power dissipation depends on the ambient temperature, the air flow velocity and the
thermal conductance of the package on the PCB.
The actual power dissipation depends on the customer application and can be calculated as follows:
P
D
= P
IO
+ P
INT
P
IO
= Σ (V
OL
I
OL
+ V
OH
I
OH
) (I/O load power dissipation, sum is performed on all I/O ports)
P
INT
= V
CC
(I
CC
+ I
A
) (internal power dissipation)
I
CC
is the total core current consumption into V
CC
as described in the “DC characteristics” and depends on the
selected operation mode and clock frequency and the usage of functions like Flash programming.
I
A
is the analog current consumption into AV
CC
.
*6: Worst case value for a package mounted on single layer PCB at specified T
A
without air flow.
*7: Write/erase to a large sector in flash memory is warranted with T
A
≤ + 105°C.
WARNING
Semiconductor devices can be permanently damaged by application of stress (voltage, current, temperature, etc.) in excess of
absolute maximum ratings. Do not exceed these ratings.
V
CC
R
+B input (0V to 16V)
Limiting
resistance
Protective diode
P-ch
N-ch
