EMC2102 Standard Microsystems Corporation, EMC2102 Datasheet - Page 45

• Manufacturer Part Number: EMC2102
• Description: Rpm-based Fan Controller with HW Thermal Shutdown
• Manufacturer: Standard Microsystems Corporation

RPM-Based Fan Controller with HW Thermal Shutdown
Datasheet
SMSC EMC2102
6.20
6.21
FDh
FFh
ADDRESS
ADDRESS
RPM
TACH READING REGISTER
=
pole fan, measuring 5 edges.
Note 6.2
The Product ID Register contains a unique 8 bit word that identifies the product.
The Revision Register contains a 8 bit word that identifies the die revision.
Product ID Register
Revision Register
Equation [3]
--------------------- - revolutions
COUNT
Product ID
Register
(EMC2102-1)
Revision
REGISTER
REGISTER
1
FFh
(Note
(
3Dh
3Dh
1Eh
F6h
F5h
0Fh
07h
If the LIMIT2K bit is set, the minimum fan speed that can be measured is approximately
1950RPM. Any fan speed lower than this value will be reported as FFh.
Table 6.27 Example TACH Reading for Specific Fan Speeds
shows the simplified translation of TACH Reading Register count to RPM assuming a 2-
6.2)
0
0
B7
B7
) 32768
×
Table 6.28 Product ID Register
0
0
Table 6.29 Revision Register
B6
B6
⎛
⎝
-------- -
sec
1
DATASHEET
0
⎞
⎠
0
B5
B5
×
60
⎛
⎝
45
--------- -
min
sec
0
1
B4
B4
⎞
⎠
LIMIT2K
0
1
0
1
0
1
0
1
0
0
B3
B3
COUNT = TACH Reading Register
0
1
B2
B2
value (in decimal)
0
0
B1
B1
0
Revision 1.95 (10-19-06)
0
16000
B0
16000
B0
RPM
2000
2000
8000
8000
500
500
00h
14h
DEFAULT
DEFAULT
.
[3]