EMC2102 Standard Microsystems Corporation, EMC2102 Datasheet - Page 34

• Manufacturer Part Number: EMC2102
• Description: Rpm-based Fan Controller with HW Thermal Shutdown
• Manufacturer: Standard Microsystems Corporation

Revision 1.95 (10-19-06)
6.3
6.4
04h
ADDRESS
20h
ADDRESS
The Critical/Thermal Shutdown Temperature Register is a read-only register that stores the Voltage
Programmable Threshold temperature used in the Thermal / Critical Shutdown circuitry. The contents
of the register reflect the calculated temperature based on the TRIP_SET voltage. This register is
updated at the end of every monitoring cycle based on the current value of TRIP_SET. The register
value reflects the exact threshold temperature.
The data format will match the selected format of the temperature data registers as shown in
The Configuration Register controls the basic functionality of the EMC2102. The bits are described
below. The Configuration Register is software locked.
Bit 7-6 - QUEUE[1:0] - determines how many consecutive out-of-limit errors must occur on the
hardware selected and software enabled temperature channels before the SYS_SHDN# pin is
asserted (see
SYS_SHDN# pin if there are four consecutive measurements with any or all channels exceeding their
corresponding limits.
Bit 5 - SYS3 - enables the high temperature limit for the External Diode 3 channel to trigger the Critical
/ Thermal Shutdown circuitry (see
Critical/Thermal Shutdown Temperature Register
Configuration Register
1
0
0
1
1
Configuration
Critical/Therm
al Shutdown
Temperature
REGISTER
REGISTER
‘0’ (default) - the External Diode 3 channel high limit will not be linked to the SYS_SHDN# pin. If
the temperature exceeds the limit, the ALERT# pin will be asserted normally.
QUEUE1:0]
Table 6.4 Critical/Thermal Shutdown Temperature Register
Table
QUEUE[1:0]
B7
Sign
5.2). The queue applies to all enabled channels simultaneously and will trigger the
B7
Table 6.5 Configuration Register
B6
0
0
1
0
1
64
B6
Table 6.6 Fault Queue
SYS3
B5
Section
DATASHEET
32
B5
SYS2
34
5.7).
B4
16
B4
SYS1
RPM-Based Fan Controller with HW Thermal Shutdown
B3
8
B3
NUMBER OF FAULTS
FORMAT
B2
4
B2
4 (default)
1
2
8
2
-
B1
B1
LOCK
1
B0
B0
SMSC EMC2102
7Fh
(+127°C)
DEFAULT
80h
DEFAULT
Table
Datasheet
6.3.