EMC2113 Datasheet, PDF (83/85 Pages) SMSC Corporation – RPM-Based Fan Controller with Multiple Temperature Zones & Hardware Thermal Shutdown

RPM-Based Fan Controller with Multiple Temperature Zones & Hardware Thermal Shutdown
Datasheet
Bits 1-0 - SPINUP_TIME[1:0] = ‘10b’ tells the circuitry that if the Spin Up Routine is invoked, it will run
at 100% duty cycle for 250ms and at 40% duty cycle for 750ms for a total spin up time of 1s.
A.2.2 LUT Configuration - Bit Description
7 - USE_DTS_F1 = ‘1b’ tells the circuitry that the data in the Pushed Temperature 1 register is in DTS
format which means that the value in the register is equal to 100C - CPU Temp.
Bit 6 - USE_DTS_F2 = ‘1b’ tells the circuitry that the data in the Pushed Temperature 1 register is in
DTS format which means that the value in the register is equal to 100°C - CPU temp.
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 = ‘0b’ tells the LUT circuitry that the FSC algorithm is active and that the LUT values
are TACH Target settings. This is the default setting.
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.
Bit 1 - TEMP3_CFG = ‘1’b tells the Look Up Table to reference the Forced Temperature 1 data instead
of the External Diode 3 data.
Bit 0- TEMP4_CFG = ‘1b’ tells the Look Up Table to reference the Forced Temperature 2 data instead
of the Internal Diode data.
Table A.6 Fan Speed Control Table Example #2
FAN
SPEED
STEP #
EXTERNAL
DIODE 1
TEMPERATURE
(CPU)
EXTERNAL
DIODE 2
TEMPERATURE
(GPU)
PUSHED
TEMPERATURE
SETTING (DTS1)
PUSHED
TEMPERATURE
SETTING (DTS2)
1
35^oC
65^oC
50^oC
40^oC
2
40^oC
75^oC
55^oC
45^oC
3
50^oC
85^oC
60^oC
50^oC
4
60^oC
90^oC
65^oC
55^oC
5
70^oC
95^oC
70^oC
60^oC
6
80^oC
100^oC
75^oC
65^oC
7
90^oC
105^oC
80^oC
80^oC
8
100^oC
110^oC
85^oC
100^oC
TACH
TARGET
HIGH BYTE
EFh
(1028 RPM)
A3h
(1508 RPM)
7Ah
(2014 RPM)
62h
(2508 RPM)
52h
(2997 RPM)
3Dh
(4029 RPM)
31h
(5016 RPM)
29h
(5994 RPM)
Note: The values shown in Table A.6 are example settings. All the cells in the look-up table are
programmable via SMBus.
SMSC EMC2113
83
DATASHEET
Revision 1.2 (10-08-09)