RPM-Based Fan Controller with Multiple Temperature Zones & Hardware Thermal Shutdown
Datasheet
Table A.2 Look Up Table Example #1 Configuration
ADDR
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
SETTING
USE_
DTS_F1
USE_
DTS_F2
LUT_
LOCK
RPM /
PWM
PUSH1_
CFG
TEMP1_
CFG
TEMP3_ TEMP4_
LUT
Configuration
CFG
0
CFG
0
50h
C0h
0
0
1
1
0
0
A.1.1
LUT Configuration Bit Description
Bit 7 - USE_DTS_F1 = ‘0b’ tells the circuitry that the Forced Temperature 1 register data is not in DTS
format.
Bit 6 - USE_DTS_F2 = ‘0b’ tells the circuitry that the Forced Temperature 2 register data is not in DTS
format.
Bit 5 - LUT_LOCK = ‘1b’ tells the circuitry that the LUT is programmed and is active. This bit must be
set for the LUT to function.
Bit 4 - RPM / PWM = ‘1b’ tells the Look Up Table that the FSC algorithm is not used and that the LUT
target values will be PWM drive settings instead of TACH Target settings.
Bit 3 - PUSH1_CFG = ‘0b’ tells the circuitry that the LUT should referenced the Forced Temperature
data instead of the PWM Input Duty Cycle data. This is the default setting.
Bit 2 - TEMP1_CFG = ‘0b’ tells the LUT to reference the External Diode 1 data instead of Forced
Temperature 1 data. This is the default setting.
Bit 1 - TEMP3_CFG = ‘0b’ tells the LUT to reference the External Diode 3 data instead of Forced
Temperature 1 data. This is the default setting.
Bit 0 - TEMP4_CFG = ‘0b’ tells the LUT to reference the Internal Diode data instead of Forced
Temperature 2 data. This is the default setting.
Table A.3 Fan Speed Control Table Example #1
EXTERNAL
FAN
SPEED
STEP #
EXTERNALDIODE
1 TEMPERATURE
(CPU)
DIODE 2
TEMPERATURE
(GPU)
EXTERNAL DIODE
3 TEMPERATURE
(SKIN)
INTERNAL DIODE
TEMPERATURE
(AMBIENT)
PWM
SETTINGS
1
2
3
4
5
6
7
8
35oC
40oC
50oC
60oC
70oC
80oC
90oC
100oC
60oC
70oC
75oC
80oC
85oC
90oC
95oC
100oC
30oC
35oC
40oC
45oC
50oC
55oC
60oC
65oC
40oC
45oC
50oC
55oC
60oC
65oC
70oC
75oC
0%
30%
40%
50%
60%
70%
80%
100%
Note: The values shown in Table A.3 are example settings. All the cells in the look-up table are
programmable via SMBus.
SMSC EMC2113
Revision 1.2 (10-08-09)
DATA8S1HEET
SMSC [ SMSC CORPORATION ]
