EMC2305-1-AP-TR SMSC, EMC2305-1-AP-TR Datasheet - Page 46

• Manufacturer Part Number: EMC2305-1-AP-TR
• Description: Industrial Temperature Sensors Penta RPM-Based PWN Fan Speed Controller
• Manufacturer: SMSC

Specifications of EMC2305-1-AP-TR

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

Revision 1.2 (03-22-10)
5.17
5.18
ADDR
ADDR
3Ch
3Dh
4Ch
4Dh
5Ch
5Dh
6Ch
6Dh
7Ch
7Dh
3Eh
3Fh
4Eh
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
The TACH Target Registers hold the target tachometer value that is maintained by the RPM-based
Fan Speed Control Algorithm.
The value in the TACH Target Registers will always reflect the current TACH Target value.
If one of the algorithms is enabled, setting the TACH Target Register to FFh will disable the fan driver
(set the fan drive setting to 0%). Setting the TACH Target to any other value (from a setting of FFh)
will cause the algorithm to invoke the Spin Up Routine after which it will function normally.
The Tach Target is not applied until the high byte is written. Once the high byte is written, the current
value of both high and low bytes will be used as the next Tach target.
TACH Target Registers
TACH Reading Registers
R
R
R
R
R
R
R
TACH Target
TACH Target
TACH Target
TACH Target
TACH Target
TACH Target
TACH Target
TACH Target
TACH Target
TACH Target
Fan 1 TACH
Fan 1 TACH
Fan 2 TACH
1 High Byte
2 High Byte
3 High Byte
4 High Byte
5 High Byte
REGISTER
1 Low Byte
2 Low Byte
3 Low Byte
4 Low Byte
5 Low Byte
REGISTER
Low Byte
Table 5.28 TACH Reading Registers
4096
4096
4096
4096
4096
4096
4096
Table 5.27 TACH Target Registers
B7
B7
16
16
16
16
16
16
2048
2048
2048
2048
2048
2048
2048
B6
B6
DATASHEET
8
8
8
8
8
8
1024
1024
1024
1024
1024
1024
1024
B5
B5
46
4
4
4
4
4
4
512
512
512
512
512
512
512
B4
B4
2
2
2
2
2
2
Multiple RPM-Based PWM Fan Controller for Five Fans
256
256
256
256
256
256
256
B3
B3
1
1
1
1
1
1
128
128
128
128
128
128
128
B2
B2
-
-
-
-
-
-
B1
B1
64
64
64
64
64
64
64
-
-
-
-
-
-
B0
B0
32
32
32
32
32
32
32
-
-
-
-
-
-
SMSC EMC2305
DEFAULT
DEFAULT
Datasheet
F8h
FFh
F8h
FFh
F8h
FFh
F8h
FFh
F8h
FFh
FFh
F8h
FFh