RPM-Based Fan Controller with HW Thermal Shutdown
Datasheet
‘1’ - The ALERT pin will be asserted for an error condition associated with External Diode 1
channel.
Bit 0 - INT_INT_EN - Allows the Internal Diode to assert the ALERT pin.
‘0’ (default) - The ALERT pin will not be asserted for any error condition associated with the Internal
Diode.
‘1’ - The ALERT pin will be asserted for an error condition associated with the Internal Diode.
6.16
Fan Interrupt Enable Register
Table 6.22 Fan Interrupt Enable Register
ADDR
R/W
REGISTER
Fan
Interrupt
Enable
B7
B6
B5
B4
B3
B2
B1
SPIN_
INT_EN
B0
STALL_
INT_EN
DEFAULT
29
R/W
-
-
-
-
-
-
00h
The Fan Interrupt Enable Register controls the masking for errors generated by the Fan Driver. When
a channel is masked, it will not cause the ALERT pin to be asserted when an error condition is
detected.
Bit 1 - SPIN_INT_EN - Allows the FAN_SPIN bit to assert the ALERT pin.
‘0’ (default) - the FAN_SPIN bit will not assert the ALERT pin though it will still update the Status
Register normally.
‘1’ - the FAN_SPIN bit will assert the ALERT pin.
Bit 0 - STALL_INT_EN - Allows the FAN_STALL bit or DRIVE_FAIL bit to assert the ALERT pin.
‘0’ (default) - the FAN_STALL bit or DRIVE_FAIL bit will not assert the ALERT pin though will still
update the Status Register normally.
‘1’ - the FAN_STALL bit will assert the ALERT pin.
6.17
PWM Configuration Register
Table 6.23 PWM Configuration Register
ADDR
2Ah
R/W
R/W
REGISTER
PWM
Config
B7
-
B6
-
B5
-
B4
PWM_
OT
B3
-
B2
-
B1
-
B0
POLA
RITY
DEFAULT
00h
The PWM Config Register controls the output type and polarity of the PWM output.
Bit 4 - PWM_OT - Determines the output type for the PWM pin.
‘0’ (default) - The PWM pin is configured as an open drain output.
‘1’ - The PWM pin is configured as a push-pull output.
Revision 0.85 (01-29-08)
52
SMSC EMC2103
DATASHEET
SMSC [ SMSC CORPORATION ]
