emc2101 Standard Microsystems Corp., emc2101 Datasheet - Page 35

• Manufacturer Part Number: emc2101
• Description: Emc2101 Fan Control With 1?c Accurate Temperature Monitoring
• Manufacturer: Standard Microsystems Corp.

SMBus Fan Control with 1°C Accurate Temperature Monitoring
Datasheet
SMSC EMC2101
6.7
6.8
05h and 0Bh
07h and 0Dh
08h and 0Eh
ADDR.
0Ch
ADDR
13h
14h
19h
21h
R/W
R/W
The
limits are checked after every temperature conversion.
If the measured temperature for the internal diode exceeds the Internal Temperature limit, then the
INT_HIGH bit is set in the Status Register. It will remain set until the internal temperature drops below
the high limit.
If the measured temperature for the External Diode exceeds the 11-bit External Diode High Limit, or
drops below the 11-bit External Diode Low Limit, then the appropriate status bit will be set. The status
bit will remain set until the temperature is no longer violating the respective limits.
If the External Diode exceeds the TCRIT Temp Limit (even if it does not exceed the External Diode
Temperature Limit), the TCRIT bit will be set in the Status Register.
The TCRIT bit will remain set in the Status Register until the External Diode Temperature drops below
a lower threshold given by equation [2].
See
Temperature Limit Registers
External Temperature Force Register
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
EMC2101
Section 6.3
Temperature Force
REGISTER
High Limit MSB
Low Limit MSB
High Limit LSB
External
External Diode
External Diode
External Diode
External Diode
Low Limit LSB
Internal Temp
TCRIT Temp
REGISTER
Hysteresis
has two 8-bit limit registers, two 11-bit limit registers, and one hysteresis register. The
and
TCRIT
Limit
Limit
Section 6.5
Table 6.8 External Diode Force Register
Table 6.7 Temperature Data Registers
TEMP
Sign
B7
0.5
0.5
=
B7
-
-
-
-
-
for ALERT / TACH pin functionality.
(
DATASHEET
T
CRIT
B6
64
0.25
0.25
B6
64
64
64
64
64
–
35
T
CRITHYS
B5
32
0.125
0.125
B5
32
32
32
32
32
B4
16
)
B4
16
16
16
16
16
-
-
B3
8
B3
8
8
8
8
8
-
-
B2
4
B2
4
4
4
4
4
-
-
B1
2
B1
2
2
2
2
2
-
-
Revision 2.53 (02-19-08)
B0
1
B0
1
1
1
1
1
-
-
[2]
DEFAULT
0Ah (10°C)
46h (70°C)
46h (70°C)
55h (85°C)
DEFAULT
00h (0°C)
00h
00h
00h