emc2105 Standard Microsystems Corp., emc2105 Datasheet - Page 50

• Manufacturer Part Number: emc2105
• Description: Emc2105 Rpm-based High Side Fan Controller With Hardware Thermal Shutdown
• Manufacturer: Standard Microsystems Corp.

ADDR
20h
ADDR
1Ch
1Dh
1Ah
1Bh
19h
Revision 1.74 (05-08-08)
6.8
6.9
R/W
R/W
once
once
once
once
once
R/W
R/W
R/W
R/W
R/W
R/W
Bit 2 - REC3 - Controls the Resistive Error Correction functionality of External Diode 3 and External
Diode 4 (if APD is enabled, see
Bit 1 - REC2 - Controls the Resistive Error Correction functionality of External Diode 2.
Bit 0 - REC1 - Controls the Resistive Error Correction functionality of External Diode 1. This bit is
locked if the SHDN_SEL pin is not pulled to VDD (see
The Critical Temperature Limit Registers store the Critical Temperature Limit. At power up, none of the
respective channels are linked to the SYS_SHDN pin or the Hardware set Thermal/Critical Shutdown
circuitry.
Whenever one of the registers is updated, two things occur. First, the register is locked so that it cannot
be updated again without a power on reset. Second, the respective temperature channel is linked to
the SYS_SHDN pin and the Hardware set Thermal/Critical Shutdown Circuitry. At this point, if the
measured temperature channel exceeds the Critical limit, the SYS_SHDN pin will be asserted, the
appropriate bit set in the Tcrit Status Register, and the TCRIT bit in the Interrupt Status Register will
be set.
Critical Temperature Limit Registers
Configuration Register
Configuration
REGISTER
‘0’ - the REC functionality for External Diode 3 is disabled
‘1’ (default) - the REC functionality for External Diode 3 is enabled.
‘0’ - the REC functionality for External Diode 2 is disabled
‘1’ (default) - the REC functionality for External Diode 2 is enabled.
‘0’ - the REC functionality for External Diode 1 is disabled
‘1’ (default) - the REC functionality for External Diode 1 is enabled.
External Diode
External Diode
External Diode
External Diode
Internal Diode
1 Tcrit Limit
2 Tcrit Limit
3 Tcrit Limit
4 Tcrit Limit
REGISTER
Tcrit Limit
MASK
B7
Sign
Sign
Sign
Sign
Sign
B7
Table 6.12 Configuration Register
B6
Table 6.11 Limit Registers
-
Section
B6
64
64
64
64
64
DATASHEET
RPM-Based High Side Fan Controller with Hardware Thermal Shutdown
B5
-
6.9)
50
B5
32
32
32
32
32
SYS4
B4
B4
16
16
16
16
16
Table
SYS3
B3
B3
6.1).
8
8
8
8
8
SYS2
B2
B2
4
4
4
4
4
SYS1
B1
B1
2
2
2
2
2
B0
SMSC EMC2105
APD
1
1
1
1
1
B0
Datasheet
DEFAULT
(+100°C)
(+100°C)
(+100°C)
(+100°C)
(+100°C)
DEFAULT
64h
64h
64h
64h
64h
00h