EMC2301 Standard Microsystems Corp., EMC2301 Datasheet - Page 23

• Manufacturer Part Number: EMC2301
• Description: Rpm-based Pwm Fan Controller
• Manufacturer: Standard Microsystems Corp.

RPM-Based PWM Fan Controller
Datasheet
Chapter 5 Register Set
SMSC EMC2301
5.1
ADDR
2Ah
2Bh
2Dh
20h
24h
25h
26h
27h
29h
30h
31h
32h
33h
35h
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R-C
R-C
R-C
R-C
The following registers are accessible through the SMBus Interface. All register bits marked as ‘-’ will
always read ‘0’. A write to these bits will have no effect.
Register Map
Fan Configuration
Fan Configuration
Drive Fail Status
Fan Stall Status
Fan Spin Status
Enable Register
PWM Polarity
Configuration
Fan Interrupt
PWM Output
PWM Divide
REGISTER
Fan Setting
PWM Base
Fan Status
Frequency
NAME
Config
Config
Gain
1
2
Controls the masking of interrupts on all
Algorithm is disabled, allows direct user
Holds the gain terms used by the RPM-
based Fan Speed Control Algorithm for
based Fan Speed Control Algorithm for
Stores status bits associated with drive
Sets configuration values for the RPM-
Sets additional configuration values for
Configures the clocking and watchdog
Configures Polarity of the PWM driver
Table 5.1 EMC2301 Register Set
driver input setting for the Fan. If the
Configures Output type of the PWM
Always displays the most recent fan
based Fan Speed Control Algorithm
Stores status bits associated with a
Stores status bits associated with a
Stores the status bits for the RPM-
Selects the base frequency for the
Stores the divide ratio to set the
RPM-based Fan Speed Control
Configuration and control
Fan Control Registers
control of the fan driver.
frequency for the Fan
DATASHEET
fan related channels
spin-up failure
the Fan driver
the Fan driver
the Fan driver
PWM output
functionality
FUNCTION
stalled fan
failure
driver
23
DEFAULT
VALUE
2Bh
2Ah
40h
00h
00h
00h
00h
00h
00h
00h
00h
00h
01h
28h
Revision 1.2 (03-22-10)
LOCK
SWL
SWL
SWL
No
No
No
No
No
No
No
No
No
No
No
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