EMC2102-DZK-TR SMSC, EMC2102-DZK-TR Datasheet - Page 43

• Manufacturer Part Number: EMC2102-DZK-TR
• Description: Industrial Temperature Sensors RPM Fan Contrllr
• Manufacturer: SMSC

Specifications of EMC2102-DZK-TR

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

RPM-Based Fan Controller with HW Thermal Shutdown
Datasheet
SMSC EMC2102
6.15
6.16
54h
55h
ADDRESS
ADDRESS
1
1
1
The Fan Step Register, along with the Update Time, controls the ramp rate of the fan driver response
calculated by the RPM based Fan Control Algorithm. The value of the register represents the maximum
step size the fan driver will take between update times (see
Register").
The Fan Step Register setting can be translated to a maximum voltage step as shown in
If the necessary fan driver delta is larger than the Fan Step, it will be capped at the Fan Step setting
and updated every Update Time ms.
The Fan Step Register is software locked.
The Fan Minimum Drive Register stores the minimum drive setting for the RPM based Fan Control
Algorithm. The RPM based Fan Control Algorithm will not drive the fan at a level lower than the
minimum drive unless the target Fan Speed is set at FFh (see
During normal operation, if the fan stops for any reason (including low drive), the RPM based Fan
Control Algorithm will attempt to restart the fan. Setting the Fan Minimum Drive Registers to a setting
that will maintain fan operation is a useful way to avoid potential fan oscillations as the control circuitry
attempts to drive it at a level that cannot support fan operation.
The Fan Minimum Drive Register is software locked.
Fan Step Register
Fan Minimum Drive Register
Fan Minimum
Drive
Fan Step
REGISTER
REGISTER
SPINUP_TIME[1:0]
128
-
B7
B7
Table 6.23 Minimum Fan Drive Register
Table 6.21 Spin Time (continued)
64
0
0
1
Table 6.22 Fan Step Register
-
B6
B6
DATASHEET
32
32
B5
B5
43
16
B4
16
B4
8
8
B3
B3
4
4
TOTAL SPIN UP TIME
B2
B2
Section 6.18, "TACH Target
Section 6.13, "Fan Configuration
2
2
1 sec
2 sec
B1
B1
1
1
B0
Revision 2.02 (05-17-07)
B0
80h
10h
DEFAULT
DEFAULT
Equation
Register")
[2].