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EMC2300 Datasheet(PDF) 28 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) 28 Page - SMSC Corporation

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Fan Control Device with High Frequency PWM and Temperature Monitors
Datasheet
Revision 0.2 (06-14-06)
28
SMSC EMC2300
DATASHEET
The temperature change is computed by measuring the change in Vbe at two different operating points
of the diode to which the Remote x+ and Remote x- pins are connected. But accuracy of the
measurement also depends on non-ideality factor of the process the diode is manufactured on.
6.8.3
Temperature Data Format
Temperature data can be read from the three temperature registers:
Internal Temp Reading register (26h)
Remote Diode 1 Temp Reading register (25h)
Remote Diode 2 Temp Reading register (27h)
Table 6.6, "Temperature Data Format" shows several examples of the format of the temperature digital
data, represented by an 8-bit, two’s complement word with an LSB equal to 1.0 0C.
6.9
Thermal Zones
Each temperature measurement input is assigned to a Thermal Zone to control the PWM outputs in
Auto Fan Control mode. These zone assignments are as follows:
Zone 1 = Remote Diode 1 (Processor)
Zone 2 = Ambient (Internal) Temperature Sensor
Zone 3 = Remote Diode 2
Table 6.6 Temperature Data Format
TEMPERATURE
READING (DEC)
READING (HEX)
DIGITAL OUTPUT
-1270C
-127
81h
1000 0001
-50 0C
-50
CEh
1100 1110
-25 0C
-25
E7h
1110 0111
-1 0C
-1
FFh
1111 1111
0 0C
0
00h
0000 0000
+1 0C
1
01h
0000 0001
+25 0C
25
19h
0001 1001
+500C
50
32h
0011 0010
+1270C
127
7Fh
0111 1111
SENSOR ERROR
128
80h
1000 0000


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