EMC2303-1-KP-TR Standard Microsystems (SMSC), EMC2303-1-KP-TR Datasheet - Page 39

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EMC2303-1-KP-TR

Manufacturer Part Number
EMC2303-1-KP-TR
Description
Manufacturer
Standard Microsystems (SMSC)
Datasheet

Specifications of EMC2303-1-KP-TR

Operating Supply Voltage (typ)
3.3V
Operating Supply Voltage (min)
3V
Operating Supply Voltage (max)
3.6V
Operating Temp Range
-40C to 125C
Operating Temperature Classification
Automotive
Mounting
Surface Mount
Pin Count
12
Lead Free Status / RoHS Status
Compliant
ADDR
Multiple RPM-Based PWM Fan Controller for Three Fans
Datasheet
37h
47h
57h
APPLICATION NOTE: The UPDATE bits and Fan Step Register settings operate independently of the RPM-based
APPLICATION NOTE: If the Fan Speed Control Algorithm is used, the default settings in the Fan Configuration 2
SMSC EMC2303
5.13
R/W
R/W
R/W
R/W
The Fan Max Step registers, along with the Update Time, control the ramp rate of the fan driver
response calculated by the RPM-based Fan Speed Control Algorithm. The value of the register
represents the maximum step size each fan driver will take between update times (see
When the FSC algorithm is enabled, Ramp Rate control is automatically used. When the FSC is not
active, then Ramp Rate control can be enabled by asserting the EN_RRC bit (see
The Fan Max Step registers are software locked.
Fan Max Step Registers
1
0
0
1
1
REGISTER
Fan 1 Max
Fan 2 Max
Fan 3 Max
SPINUP_TIMEX[1:0]
Fan Speed Control Algorithm and will always limit the fan drive setting. That is, if the
programmed fan drive setting (either as determined by the RPM-based Fan Speed Control
Algorithm or by manual settings) exceeds the current fan drive setting by greater than the
Fan Step Register setting, the EMC2303 will limit the fan drive change to the value of the
Fan Step Register. It will use the Update Time to determine how often to update the drive
settings.
Register will cause the maximum fan step settings to be ignored.
Step
Step
Step
Table 5.23 Fan Max Step Registers
B7
-
-
-
Table 5.22 Spin Time
B6
-
-
-
DATASHEET
0
0
1
0
1
B5
32
32
32
39
B4
16
16
16
B3
8
8
8
B2
TOTAL SPIN UP TIME
4
4
4
500 ms (default)
250 ms
B1
1 sec
2 sec
2
2
2
Revision 1.2 (03-22-10)
Section
B0
1
1
1
Section
5.10).
DEFAULT
10h
10h
10h
5.9).

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