EMC2106_09 Datasheet, PDF (99/106 Pages) SMSC Corporation – Dual RPM-Based Linear Fan Controller with Hardware Thermal Shutdown

Dual RPM-Based Linear Fan Controller with Hardware Thermal Shutdown
Datasheet
Table B.2 Look Up Table Example #1 Configuration
ADDR
50h
REGISTER
LUT 1
Configuration
B7
USE_D
TS_F1
0
B6
B5
B4
USE_D LUT_L TACH /
TS_F2 OCK DRIVE
0
1
1
B3
B2
TEMP3_CFG
[1:0]
0
0
B1
B0
TEMP4_CFG
[1:0]
0
0
SETTING
C0h
B.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 - TACH / DRIVE = ‘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.
Bits 3- 2 - TEMP3_CFG = ‘00b’ tells the LUT to reference the External Diode 3 data instead of Forced
Temperature 1 data or the TRIP_SET / VIN4 voltage 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 or the External Diode 4 temperature data. This is the default setting.
FAN
SPEED
STEP #
1
2
3
4
5
6
7
8
Table B.3 Fan Speed Control Table Example #1
EXTERNAL
DIODE 1
TEMPERATURE
(CPU)
35^oC
40^oC
50^oC
60^oC
70^oC
80^oC
90^oC
100^oC
EXTERNAL
DIODE 2
TEMPERATURE
(GPU)
60^oC
70^oC
75^oC
80^oC
85^oC
90^oC
95^oC
100^oC
EXTERNAL
DIODE 3
TEMPERATURE
(SKIN)
30^oC
35^oC
40^oC
45^oC
50^oC
55^oC
60^oC
65^oC
INTERNAL DIODE
TEMPERATURE
(AMBIENT)
40^oC
45^oC
50^oC
55^oC
60^oC
65^oC
70^oC
75^oC
FAN DRIVE
SETTINGS
0%
30%
40%
50%
60%
70%
80%
100%
Note: The values shown in Table B.3 are example settings. All the cells in the look-up table are
programmable via SMBus.
SMSC EMC2106
99
DATASHEET
Revision 1.78 (04-21-09)