RPM-Based Fan Controller with HW Thermal Shutdown
Datasheet
6.35
GPIO Output Configuration Register (EMC2103-2 Only)
Table 6.51 GPIO Output Configuration Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
GPIO
Output
Config
GPIO
2_OT
GPIO
1_OT
E2
R/W
-
00h
The GPIO Output Configuration Register controls the output pin type of each GPIO pin.
Bit 1 - GPIO2_OT - Determines the output type for GPIO2.
‘0’ (default) - GPIO2 is configured as an open drain output (if enabled as an output).
‘1’ - GPIO2 is configured as a push-pull output (if enabled as an output).
Bit 0 - GPIO1_OT - Determines the output type for GPIO1.
‘0’ (default) - GPIO1 is configured as an open drain output (if enabled as an output).
‘1’ - GPIO1 is configured as a push-pull output (if enabled as an output).
6.36
GPIO Input Register (EMC2103-2 Only)
Table 6.52 GPIO Input Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
GPIO
2_IN
GPIO
1_IN
E3h
R
GPIO Input
-
-
00h
The GPIO Input Register indicates the state of the corresponding GPIO pin. When a GPIO is
configured as an input, any change of state will assert the ALERT# pin (unless GPIO interrupts are
masked, see Section 6.15).
Bit 1 - GPIO2_IN - Indicates the pin state of the GPIO2 pin regardless of the pin functionality.
Bit 0 - GPIO1_IN - Indicates the pin state of the GPIO1 pin regardless of the pin functionality.
6.37
GPIO Output Register (EMC2103-2 Only)
Table 6.53 GPIO Output Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
GPIO
Output 1
GPIO2 GPIO1
_OUT _OUT
E4h
R/W
-
-
00h
The GPIO Output Register controls the state of the corresponding pins when they are configured as
outputs.
If the output is configured as an open-drain output, then it requires a pull-up resistor to VDD. Setting
the corresponding bit to a ‘1’ will act to disable the output allowing the pull-up resistor to pull the output
high. Setting the corresponding bit to a ‘0’ will enable the output and drive the pin to a logical ‘0’ state.
Revision 0.85 (01-29-08)
SMSC EMC2103
DATA6S6HEET
SMSC [ SMSC CORPORATION ]
