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EMC2300 Datasheet(PDF) 50 Page - SMSC Corporation

Part No. EMC2300
Description  Fan Control Device with High Frequency PWM and Temperature Monitors
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Maker  SMSC [SMSC Corporation]
Homepage  http://www.smsc.com
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EMC2300 Datasheet(HTML) 50 Page - SMSC Corporation

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Fan Control Device with High Frequency PWM and Temperature Monitors
Datasheet
Revision 0.2 (06-14-06)
50
SMSC EMC2300
DATASHEET
Temperature Reading registers will be updated automatically by the EMC2300 Chip with a minimum
frequency of 4Hz.
Note: These registers are read only – a write to these registers has no effect.
Each of the temperature reading registers are mapped to a zone. Each PWM may be programmed to
operate in the auto fan control operating mode by associating a PWM with one or more zones. The
following is a list of the zone associations.
Zone 1 is controlled by Remote Diode 1 Temp Reading
Zone 2 is controlled by Internal Temp Reading (Ambient Temperature Sensor)
Zone 3 is controlled by Remote Diode 2 Temp Reading
8.2.3
Registers 28-2Fh: Fan Tachometer Reading
Table 8.5 Temperature vs. Register Reading
TEMPERATURE
READING (DEC)
READING (HEX)
-127
°c
-127
81h
.
.
.
.
.
.
.
.
.
-50
°c
-50
CEh
.
.
.
.
.
.
.
.
.
0
°c
0
00h
.
.
.
.
.
.
.
.
.
50
°c
50
32h
.
.
.
.
.
.
.
.
.
127
°c
127
7Fh
(SENSOR ERROR)
80h
Table 8.6 Registers 28-2Fh: Fan Tachometer Reading
Register
Address
Read/
Write
Register Name
Bit 7
(MSb)
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
(LSb)
Default
Value
28h
R
Tach1 LSB
7
6
5
4
3
2
1
0
N/A
29h
R
Tach1 MSB
15
14
13
12
11
10
9
8
N/A
2Ah
R
Tach2 LSB
7
6
5
4
3
2
1
0
N/A
2Bh
R
Tach2 MSB
15
14
13
12
11
10
9
8
N/A
2Ch
R
Tach3 LSB
7
6
5
4
3
2
1
0
N/A
2Dh
R
Tach3 MSB
15
14
13
12
11
10
9
8
N/A
2Eh
R
Tach4 LSB
7
6
5
4
3
2
1
0
N/A
2Fh
R
Tach4 MSB
15
14
13
12
11
10
9
8
N/A


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