RPM-Based Fan Controller with Multiple Temperature Zones & Hardware Thermal Shutdown
Datasheet
Table 6.3 Fan Controls Active for Operating Mode
DIRECT PWM
SETTING MODE
DIRECT PWM SETTING W/
LUT MODE
FSC MODE
FSC W/ LUT MODE
Fan Driver Setting (read
/ write)
Fan Driver Setting (read
only)
Fan Driver Setting (read only) Fan Driver Setting (read
only)
EDGES[1:0]
EDGES[1:0]
(Fan Configuration)
EDGES[1:0]
EDGES[1:0]
-
RANGE[1:0]
(Fan Configuration)
-
RANGE[1:0]
(Fan Configuration)
UPDATE[2:0]
(Fan Configuration)
UPDATE[2:0]
(Fan Configuration)
UPDATE[2:0]
(Fan Configuration)
UPDATE[2:0]
(Fan Configuration)
LEVEL
(Spin Up Configuration)
LEVEL
(Spin Up Configuration)
LEVEL
(Spin Up Configuration)
LEVEL
(Spin Up Configuration)
SPINUP_TIME[1:0]
(Spin Up Configuration)
SPINUP_TIME[1:0]
(Spin Up Configuration)
SPINUP_TIME[1:0]
(Spin Up Configuration)
SPINUP_TIME[1:0]
(Spin Up Configuration)
Fan Max Step
Fan Max Step
Fan Max Step
Fan Max Step
-
Fan Minimum Drive
Valid TACH Count
Fan Minimum Drive
Valid TACH Count
TACH Target (read only)
Valid TACH Count
-
Valid TACH Count
-
TACH Target (read /
write)
TACH Reading
-
TACH Reading
-
TACH Reading
TACH Reading
Look Up Table Drive /
Temperature Settings (read
only)
Look up Table Drive /
Temperature Settings
(read only)
-
DRIVE_FAIL_CNT [1:0]
(Spin Up Configuration) +
Fan Drive Fail Band
-
DRIVE_FAIL_CNT [1:0]
(Spin Up Configuration)
+ Fan Drive Fail Band
6.3
6.4
PWM Fan Driver
The EMC2113 supports a high or low frequency PWM driver. The output can be configured as either
push-pull or open drain and the frequency ranges from 9.5Hz to 26kHz in four programmable
frequency bands.
The PWM frequency range is coarsely adjusted via the PWM Base Frequency register (Section 7.19)
with a fine tune adjustment performed via the PWM Divider registers (see Section 7.23). General PWM
operation is governed by the PWM Configuration register (see Section 7.18).
Fan Control Look-Up Table
The EMC2113 uses a look-up table to apply a user-programmable fan control profile based on
measured temperature to the fan driver. In this look-up table, each temperature channel is allowed to
control the fan drive output independently (or jointly) by programming up to eight pairs of temperature
and drive setting entries.
The Look Up Table supports external data pushed into the device by the Host in either DTS or standard
format. Each of the four temperature channels used by the Look Up table is generated from measured
temperature sensors on the EMC2113 or from an external source.
SMSC EMC2113
Revision 1.2 (10-08-09)
DATA2S7HEET
SMSC [ SMSC CORPORATION ]
