GMS82512/16/24
HYUNDAI MicroElectronics
is external pull-down register, it is set to low.
V
DD
INPUT PIN
INPUT PIN
V
V
DD
DD
internal
pull-up
i=0
V
DD
OPEN
O
O
i
O
i
Very weak current flows
V
DD
GND
i=0
X
GND
X
OPEN
Weak pull-up current flows
O
When port is configure as an input, input level should
be closed to 0V or 5V to avoid power consumption.
Figure 16-2 Application Example of Unused Input Port
OUTPUT PIN
OUTPUT PIN
ON
V
ON
V
DD
DD
OPEN
L
L
OFF
ON
OFF
ON
O
i=0
OFF
OFF
i
i
V
GND
DD
GND
GND
ON
X
O
X
OFF
In the left case, Tr. base current flows from port to GND.
To avoid power consumption, there should be low output
to the port.
O
In the left case, much current flows from port to GND.
Figure 16-3 Application Example of Unused Output Port
58
FEB. 2000 Ver 1.00
HYNIX [ HYNIX SEMICONDUCTOR ]
