mc9s12vr48 Freescale Semiconductor, Inc, mc9s12vr48 Datasheet - Page 511

• Manufacturer Part Number: mc9s12vr48
• Description: S12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

A.1.3
Power supply must maintain regulation within operating V
operating maximum current conditions.
regulator with VDDX output. It shows also the power & gound pins VSUP, VDDX, VSSX and VSSA. Px
represents any 5V GPIO pin. Assume Px is configured as an input. The pad driver transistors P1 and N1
are switched off (high impedance). If the voltage V
current I
the internal power supply VDDX may go out of regulation. Ensure external V
greater than maximum injection current. This will be the greatest risk when the MCU is not consuming
power; e.g., if no system clock is present, or if clock rate is very low which would reduce overall power
consumption.
A.1.4
Absolute maximum ratings are stress ratings only. A functional operation under or outside those maxima
is not guaranteed. Stress beyond those limits may affect the reliability or cause permanent damage of the
device.
This device contains circuitry protecting against damage due to high static voltage or electrical fields;
however, it is advised that normal precautions be taken to avoid application of any voltages higher than
Freescale Semiconductor
Voltage Regulator
V
BG
in
will flow through diode D1 into VDDX node. If this injection current I
Current Injection
Absolute Maximum Ratings
+
_
Figure A-1. Current Injection on GPIO Port if V
VSUP
MC9S12VR Family Reference Manual, Rev. 2.2
P2
Preliminary - Subject to Change Without Notice
I
SUP
Figure A-1.
I
C
DDX
Load
I
Load
in
shows a 5V GPIO pad driver and the on chip voltage
on Px is greated than V
DDX
Pad Driver
P1
N1
or V
DD
I
in
D1
in
range during instantaneous and
> V
DDX
DDX
DDX
I
in
in
MCU Electrical Specifications
a positive injection
load will shunt current
is greater than I
V
in
Px
VDDX
VSSX
VSSA
> V
DDX
Load
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