RPM-Based Fan Controller with Multiple Temperature Zones & Hardware Thermal Shutdown
Datasheet
Bit 5 - DIS_TO - Disables the SMBus timeout function.
‘0’ (default) - The SMBus timeout function is enabled.
‘1’ - The SMBus timeout function is disabled allowing the device to be fully I2C compliant.
Bit 4 - DIS_AVG - Disables digital averaging of the External Diode channels.
‘0’ (default) - The External Diode channels have digital averaging enabled. The temperature data
is the average of the previous four measurements.
‘1’ - The External Diode channels have digital averaging disabled. The temperature data is the last
measured data.
Bits 3-2 - QUEUE[1:0] - Determines the number of consecutive out of limit conditions that are
necessary to trigger an interrupt. Each measurement channel has a separate fault queue associated
with the high limit, low limit, and diode fault condition.
APPLICATION NOTE: If the fault queue for any channel is currently active (i.e. an out of limit condition has been
detected and caused the fault queue to increment) then changing the settings will not take
effect until the fault queue is zeroed. This occurs by the ALERT pin asserting or the out of
limit condition being removed.
Table 7.18 Fault Queue
QUEUE[1:0]
1
0
NUMBER OF CONSECUTIVE OUT OF LIMIT CONDITIONS
0
0
1
1
0
1
0
1
1 (disabled)
2
3
4 (default)
Bit 1 - 0 - CONV[1:0] - determines the conversion rate of the temperature monitoring. This conversion
rate does not affect the fan driver. The supply current from VDD_3V is nominally dependent upon the
conversion rate and the average current will increase as the conversion rate increases.
Table 7.19 Conversion Rate
CONV[1:0]
1
0
CONVERSION RATE
0
0
1
1
0
1
0
1
1 / sec
2 / sec
4 / sec (default)
Continuous
The Configuration 2 Register is software locked.
Revision 1.2 (10-08-09)
SMSC EMC2113
DATA5S2HEET
SMSC [ SMSC CORPORATION ]
