EMC2113 Datasheet, PDF (51/88 Pages) SMSC Corporation – RPM-Based Fan Controller with Multiple Temperature Zones & Hardware Thermal Shutdown

RPM-Based Fan Controller with Multiple Temperature Zones & Hardware Thermal Shutdown
Datasheet
 ‘1’ - the External Diode 3 channel high limit will be linked to the SYS_SHDN pin. If the temperature
meets or exceeds the limit then the SYS_SHDN pin will be asserted. The SYS_SHDN pin will be
released when the temperature drops below the high limit. The ALERT pin will be asserted
normally.
Bit 2 - SYS2 - Enables the high temperature limit for the External Diode 2 channel to trigger the
Critical/Thermal Shutdown circuitry (see Section 6.1).
 ‘0’ (default) - the External Diode 2 channel high limit will not be linked to the SYS_SHDN pin. If the
temperature meets or exceeds the limit, the ALERT pin will be asserted normally.
 ‘1’ - the External Diode 2 channel high limit will be linked to the SYS_SHDN pin. If the temperature
meets or exceeds the limit then the SYS_SHDN pin will be asserted. The ALERT pin will be
asserted normally.
Bit 1 - SYS1 - Enables the high temperature limit for the External Diode 1 channel to trigger the
Critical/Thermal Shutdown circuitry (see Section 6.1).
 ‘0’ (default) - The External Diode 1 channel high limit will not be linked to the SYS_SHDN pin. If
the temperature meets or exceeds the limit, the ALERT pin will be asserted normally.
 ‘1’ - The External Diode 1 channel high limit will be linked to the SYS_SHDN pin. If the temperature
meets or exceeds the limit then the SYS_SHDN pin will be asserted. The ALERT pin will be
asserted normally.
Bit 0 - APD - This bit enables the Anti-parallel diode functionality on the External Diode 3 pins (DP3
and DN3).
 ‘0’ (default) - The Anti-parallel diode functionality is disabled. The External Diode 2 channel can be
configured for any type of diode
 ‘1’ - The Anti-parallel diode functionality is enabled. Both the External Diode 2 and 3 channels are
configured to support a diode or diode connected transistor (such as a 2N3904).
APPLICATION NOTE: When the APD diode is enabled, there will be a delay of a full temperature update before
any comparisons and functionality associated with the External Diode 3 channel will be
implemented. This includes the SYS3 bit operation, limit comparisons, and look up table
comparisons.
The Configuration Register is software locked.
7.12 Configuration 2 Register
ADDR R/W
21h R/W
REGISTER
Config 2
Table 7.17 Configuration 2 Register
B7
B6
B5
B4 B3 B2
-
DIS_
DYN
DIS_
TO
DIS_
AVG
QUEUE[1:0]
B1 B0
CONV[1:0]
DEFAULT
0Eh
The Configuration 2 Register controls conversion rate of the temperature monitoring as well as the
fault queue.
Bit 6 - DIS_DYN - Disables the Dynamic Averaging Feature.
 ‘0’ (default) - The Dynamic Averaging function is enabled. The conversion time for all temperature
channels is scaled based on the chosen conversion rate to maximize accuracy and immunity to
random temperature measurement variation.
 ‘1’ - The Dynamic Averaging function is disabled. The conversion time for all temperature channels
is fixed regardless of the chosen conversion rate.
 2013 Microchip Technology Inc.
DS20005251A-page 51