EMC2302 Standard Microsystems Corp., EMC2302 Datasheet - Page 23

• Manufacturer Part Number: EMC2302
• Description: Rpm-based Pwm Fan Controller
• Manufacturer: Standard Microsystems Corp.

Dual RPM-Based PWM Fan Controller
Datasheet
Chapter 5 Register Set
SMSC EMC2302
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
Drive Fail Status
Fan Stall Status
Fan Spin Status
Enable Register
Configuration 1
Configuration 2
PWM 1 Divide
PWM Polarity
Fan 1 Setting
Configuration
Fan Interrupt
PWM Output
REGISTER
PWM Base
Fan Status
Frequency
Gain 1
NAME
Config
Config
Fan 1
Fan 1
Controls the masking of interrupts on all
Configures Output type of PWM drivers
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 Polarity of all PWM drivers
Configures the clocking and watchdog
Table 5.1 EMC2302 Register Set
Selects the base frequency for PWM
Always displays the most recent fan
based Fan Speed Control Algorithm
Stores status bits associated with a
Stores status bits associated with a
driver input setting for Fan 1. If the
Stores the status bits for the RPM-
Stores the divide ratio to set the
RPM-based Fan Speed Control
Configuration and control
Fan 1 Control Registers
control of the fan driver.
DATASHEET
fan related channels
frequency for Fan 1
the Fan 1 driver
the Fan 1 driver
the Fan 1 driver
spin-up failure
functionality
FUNCTION
stalled fan
output 2
failure
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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