EMC2101-ACZT-TR SMSC, EMC2101-ACZT-TR Datasheet - Page 40

• Manufacturer Part Number: EMC2101-ACZT-TR
• Description: Industrial Temperature Sensors Sngl Fan Contrllr
• Manufacturer: SMSC

Specifications of EMC2101-ACZT-TR

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

ADDR
46h
47h
ADDR
48h
49h
Revision 2.54 (06-16-09)
6.14
6.15
R/W
R
R
ENABLE
R/W
R/W
R/W
0
0
0
0
0
0
0
0
1
TACH Reading
TACH Reading
REGISTER
High Byte
Low Byte
The TACH Registers hold the 16-bit TACH Reading. This reading represents the number of TACH
counts detected. The RPM of the fan can be determined by Equation
Reference
When determining the final fan speed, the TACH[15:0] bits need to be decoded into an equivalent
decimal number.
TACH Reading Registers
TACH Limit Registers
REGISTER
TACH Limit
TACH Limit
High Byte
Low Byte
RPM
=
Table"). The bit weighting of each TACH[15:0] bit is shown in parenthesis after the value.
------------------------------------------- -
TACH _ COUNT
TACH15
(32768)
TACH7
(128)
TACH_
TACH_
B7
5 400 000
B2
L15
,
B7
X
L7
0
0
0
0
1
1
1
1
Table 6.17 TACH Reading Low Byte Register
,
Table 6.16 TACH Reading Registers
TACH14
(16384)
TACH6
TACH_
TACH_
(64)
B6
L14
B6
L6
Table 6.15 CPU Beta Values
DATASHEET
TACH13
TACH5
TACH_
TACH_
(8192)
(32)
L13
B5
B5
L5
B1
X
0
0
1
1
0
0
1
1
40
TACH_
TACH_
TACH12
TACH4
SMBus Fan Control with 1°C Accurate Temperature Monitoring
(4096)
L12
B4
L4
(16)
B4
Where: TACH_COUNT is the
decimal representation of the
TACH_
TACH_
L11
TACH11
B3
L3
TACH3
(2048)
B3
(8)
TACH[13:0] bits.
B0
0
1
0
1
0
1
0
1
X
TACH_
TACH_
L10
B2
L2
TACH10
TACH2
(1024)
[3]
B2
(4)
(see also
TACH_
TACH_
0.11
0.18
0.25
0.33
0.43
1.00
2.33
Disabled
Automatic detection
B1
L1
L9
TACH1
TACH9
(512)
MINIMUM BETA
B1
(2)
Appendix B "TACH
TACH_
TACH_
B0
L0
L8
SMSC EMC2101
TACH0
TACH8
(256)
B0
(1)
[3]
Datasheet
DEFAULT
FFh
FFh
DEFAULT
FFh
FFh