EMC2103-2-AP-TR Standard Microsystems (SMSC), EMC2103-2-AP-TR Datasheet - Page 47

• Manufacturer Part Number: EMC2103-2-AP-TR
• Description: CLOSED LOOP RPM FAN CONTROLLER
• Manufacturer: Standard Microsystems (SMSC)

ADDR
1Dh
1Ah
1Bh
19h
RPM-Based Fan Controller with HW Thermal Shutdown
Datasheet
SMSC EMC2103
6.9
once
once
once
once
R/W
R/W
R/W
R/W
R/W
The REC Configuration Register determines whether Resistance Error Correction is used for each
external diode channel.
Bit 2 - REC3 (EMC2102-2 only)- Controls the Resistance Error Correction functionality of External
Diode 3 (if enabled)
Bit 1 - REC2 (EMC2103-2 only)- Controls the Resistance Error Correction functionality of External
Diode 2. If External Diode 2 is selected as the hardware shutdown channel then this bit is read only
and determined by the SHDN_SEL pin (see
Bit 0 - REC1 - Indicates the Resistance Error Correction functionality of External Diode 1. If External
Diode 1 is selected as the hardware shutdown channel then this bit is read only and determined by
the SHDN_SEL pin (see
The REC Configuration Register is software locked.
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
‘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’ - the REC functionality for External Diode 2 is enabled.
‘0’ - the REC functionality for External Diode 1 is disabled
‘1’ - the REC functionality for External Diode 1 is enabled.
External Diode
External Diode
External Diode
Internal Diode
1 Tcrit Limit
2 Tcrit Limit
3 Tcrit Limit
REGISTER
Tcrit Limit
Sign
Sign
Sign
Sign
B7
Section
Table 6.14 Limit Registers
5.1.1).
B6
64
64
64
64
DATASHEET
47
B5
32
32
32
32
Section
B4
16
16
16
16
5.1.1).
B3
8
8
8
8
B2
4
4
4
4
B1
2
2
2
2
Revision 0.88 (06-30-08)
B0
1
1
1
1
DEFAULT
(+100°C)
(+100°C)
(+100°C)
(+100°C)
64h
64h
64h
64h