emc2104 Standard Microsystems Corp., emc2104 Datasheet - Page 57

• Manufacturer Part Number: emc2104
• Description: Emc2104 Dual Rpm-based Pwm Fan Controller With Hardware Thermal Shutdown
• Manufacturer: Standard Microsystems Corp.

ADDR
22h
Dual RPM-Based PWM Fan Controller with Hardware Thermal Shutdown
Datasheet
APPLICATION NOTE: If the fault queue for any channel is currently active (i.e. an out of limit condition has been
SMSC EMC2104
6.11
1
0
0
1
1
R/W
R/W
CONV[1:0]
1
0
0
1
1
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.
The Configuration 3 Register controls the four voltage input channels. This register is software locked.
Bit 6 - VIN4_INV - Determines whether the VIN4 channel data is inverted.
Configuration 3 Register
‘0’ (default) - The VIN4 channel data is not inverted.
QUEUE[1:0]
REGISTER
Config 3
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
B7
-
0
0
1
0
1
Table 6.16 Configuration 3 Register
Table 6.15 Conversion Rate
CONVERSION RATE
VIN4_I
NV
B6
Table 6.14 Fault Queue
4 / sec (default)
Continuous
DATASHEET
Section
1 / sec
2 / sec
NUMBER OF CONSECUTIVE OUT OF LIMIT CONDITIONS
VIN3
_EN
B5
57
6.1.1) when compared against the threshold set by the
VIN3
_INV
B4
VIN2
_EN
B3
DYN_DIS = ‘0’
TEMPERATURE OVER SAMPLING
1 (disabled)
4 (default)
VIN2
_INV
x8
x4
x2
x1
B2
2
3
FROM 11 BITS
VIN1
_EN
B1
Revision 1.74 (05-08-08)
DYN_DIS = ‘1’
VIN1
_INV
B0
x1
x1
x1
x1
DEFAULT
00h