emc2105 Standard Microsystems Corp., emc2105 Datasheet - Page 52

• Manufacturer Part Number: emc2105
• Description: Emc2105 Rpm-based High Side Fan Controller With Hardware Thermal Shutdown
• Manufacturer: Standard Microsystems Corp.

APPLICATION NOTE: If the fault queue for any channel is currently active (i.e. an out of limit condition has been
Revision 1.74 (05-08-08)
1
0
0
1
1
CONV[1:0]
1
0
0
1
1
Bit 5 - DIS_TO - Disables the SMBus time out function for the SMBus client (if enabled).
Bit 4 - DIS_AVG - Disables digital averaging of the External Diode 1 channel.
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 except the internal diode.
The Critical / Thermal Shutdown temperature has a separate fault queue that applies to the selected
hardware shutdown channel (see
TRIP_SET pin.
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.
‘1’ - The Dynamic Averaging function is disabled. The conversion time for all temperature channels
is fixed regardless of the chosen conversion rate.
‘0’ (default) - The SMBus time out function is enabled.
‘1’ - The SMBus time out function is disabled allowing the device to be fully I
‘0’ (default) - The External Diode 1 channel has digital averaging enabled. The temperature data
is the average of the previous four measurements.
‘1’ - The External Diode 1 channel has digital averaging disabled. The temperature data is the last
measured data.
QUEUE[1:0]
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.
0
0
1
0
1
0
0
1
0
1
Table 6.15 Conversion Rate
CONVERSION RATE
Table 6.14 Fault Queue
4 / sec (default)
Continuous
DATASHEET
Section
1 / sec
2 / sec
RPM-Based High Side Fan Controller with Hardware Thermal Shutdown
NUMBER OF CONSECUTIVE OUT OF LIMIT CONDITIONS
52
6.1.1) when compared against the threshold set by the
DYN_DIS = ‘0’
TEMPERATURE OVER SAMPLING
1 (disabled)
4 (default)
x8
x4
x2
x1
2
3
FROM 11 BITS
2
C compliant.
DYN_DIS = ‘1’
SMSC EMC2105
x1
x1
x1
x1
Datasheet