EMC2103 Standard Microsystems Corporation, EMC2103 Datasheet - Page 78

• Manufacturer Part Number: EMC2103
• Description: Rpm-based Fan Controller with HW Thermal Shutdown
• Manufacturer: Standard Microsystems Corporation

ADDR
42h
46h
50h
Revision 0.85 (01-29-08)
A.2
STEP #
SPEED
FAN
1
2
3
4
5
6
Configuration
Configuration
Configuration
REGISTER
Fan 1 Spin
LUT 1
Fan 1
Up
1
TEMPERATURE
Example #2
This example uses the RPM based Fan Speed Control Algorithm. The Spin Level (used by the Spin
Up Routine) should be changed to 50% drive for a total Spin Time of 1 second. For all other RPM
configuration settings, the default conditions are used.
For control inputs, it uses the External Diode 1 channel normally, the External Diode 2 channel
normally, and both Pushed Temperature registers in DTS format. The configuration is set as shown in
Table A.5
Note that when using DTS data, the USE_DTS_F1 and / or USE_DTS_F2 bits should be set. The
Pushed Temperature Registers are loaded with the normal DTS values as received by the processor.
When the DTS value is used by the Look Up Table, the value that is stored in the Pushed Temperature
Register is subtracted from a fixed temperature of 100°C. This resultant value is then compared
against the Look Up Table thresholds normally. When programming the Look Up Table, it is necessary
to take this translation into account or else incorrect settings may be selected.
EXTERNAL
DIODE 1
(CPU)
35
40
50
60
70
80
o
o
o
o
o
o
C
C
C
C
C
C
USE_DT
DRIVE_FAIL_CNT1
ALGO
while
S_F1
EN_
B7
1
0
1
Table A.6
[1:0]
Table A.5 Look Up Table Example #2 Configuration
Table A.6 Fan Speed Control Table Example #2
TEMPERATURE
USE_D
TS_F2
EXTERNAL
B6
DIODE 2
1
0
1
RANGE[1:0]
100
(GPU)
65
75
85
90
95
shows how the table is loaded.
o
o
o
o
o
o
C
C
C
C
C
C
NOKICK
LUT_LO
CK
B5
DATASHEET
0
1
0
1
SETTING (DTS1)
TEMPERATURE
78
RPM /
PWM
PUSHED
B4
EDGES[1:0]
0
0
0
50
55
60
65
70
75
o
o
o
o
o
o
SPIN_LVL[2:0]
C
C
C
C
C
C
RPM-Based Fan Controller with HW Thermal Shutdown
B3
1
1
0
-
TEMP3
_CFG
SETTING (DTS2)
TEMPERATURE
B2
0
0
1
PUSHED
40
45
50
55
60
65
UPDATE[2:0]
o
o
o
o
o
o
C
C
C
C
C
C
SPINUP_TIME
B1
1
1
0
[1:0]
TEMP
3_CFG
SMSC EMC2103
(1007 RPM)
(2048 RPM)
(3072 RPM)
(4096 RPM)
(5120 RPM)
(6144 RPM)
B0
1
0
1
TARGET
TACH
3Dh
0Ch
1Eh
14h
0Fh
0Ah
Datasheet
SETTING
CBh
0Ah
E5h