RPM-Based Fan Controller with HW Thermal Shutdown
Datasheet
‘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 6.16 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 6.17 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.
6.12
Interrupt Status Register
Table 6.18 Interrupt Status Register
B6 B5 B4 B3
ADDR
R/W REGISTER
B7
B2
B1
B0
DEFAULT
Interrupt
Status
23h
R-C
-
TCRIT GPIO
FAN
HIGH
LOW
FAULT
00h
Register
SMSC EMC2103
Revision 0.85 (01-29-08)
DATA4S9HEET
SMSC [ SMSC CORPORATION ]
