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EMC2300 Datasheet(PDF) 58 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) 58 Page - SMSC Corporation

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Fan Control Device with High Frequency PWM and Temperature Monitors
Datasheet
Revision 0.2 (06-14-06)
58
SMSC EMC2300
DATASHEET
8.2.11
Registers 4E-53h: Temperature Limit Registers
Setting the Lock bit has no effect on these registers.
If an external temperature input or the internal temperature sensor either exceeds the value set in the
high limit register or is less than or equal to the value set in the low limit register, the corresponding
bit will be set automatically by the EMC2300 in the Interrupt Status Register 1 (41h). For example, if
the temperature reading from the Remote1- and Remote1+ inputs exceeds the Remote Diode 1 High
Temp register limit setting, Bit[4] D1 of the Interrupt Status Register 1 will be set. The temperature limits
in these registers are represented as 8 bit, 2’s complement, signed numbers in Celsius, as shown
below in Table 8.20.
Table 8.18 Voltage Limits vs. Register Setting
INPUT
NOMINAL
VOLTAGE
REGISTER
SETTING AT
NOMINAL
VOLTAGE
MAXIMUM
VOLTAGE
REGISTER
SETTING AT
MAXIMUM
VOLTAGE
MINIMUM
VOLTAGE
REGISTER
SETTING AT
MINIMUM VOLTAGE
Vccp
2.25V
C0h
3.00V
FFh
0V
00h
VCC
3.3V
C0h
4.38V
FFh
0V
00h
Table 8.19 Registers 4E-53h: Temperature Limit Registers
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
4Eh
R/W
Remote Diode 1 Low Temp
7
6
5
4
3
2
1
0
81h
4Fh
R/W
Remote Diode 1 High Temp
7
6
5
4
3
2
1
0
7Fh
50h
R/W
Internal Low Temp
7
6
5
4
3
2
1
0
81h
51h
R/W
Internal High Temp
7
6
5
4
3
2
1
0
7Fh
52h
R/W
Remote Diode 2 Low Temp
7
6
5
4
3
2
1
0
81h
53h
R/W
Remote Diode 2 High Temp
7
6
5
4
3
2
1
0
7Fh
Table 8.20 Temperature Limits vs. Register Settings
TEMPERATURE
LIMIT (DEC)
LIMIT (HEX)
-127
°c
-127
81h
.
.
.
.
.
.
.
.
.
-50
°c-50
CEh
.
.
.
.
.
.
.
.
.
0
°c0
00h
.
.
.
.
.
.
.
.
.
50
°c50
32h
.
.
.
.
.
.
.
.
.
127
°c
127
7Fh


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