EMC2101-R-ACZL-TR datasheet(40/57 Pages) SMSC

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SMBus Fan Control with 1°C Accurate Temperature Monitoring

Datasheet

Revision 2.54 (06-16-09)

SMSC EMC2101

DATASHEET

6.14

TACH Reading Registers

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 [3] (see also Appendix B "TACH

Reference Table"). The bit weighting of each TACH[15:0] bit is shown in parenthesis after the value.

When determining the final fan speed, the TACH[15:0] bits need to be decoded into an equivalent

decimal number.

6.15

TACH Limit Registers

Table 6.15 CPU Beta Values

ENABLE

MINIMUM BETA

0.11

0.18

0.25

0.33

0.43

1.00

2.33

Disabled

Automatic detection

Table 6.16 TACH Reading Registers

ADDR

R/W

DEFAULT

46h

TACH Reading

Low Byte

TACH7

(128)

TACH6

(64)

TACH5

(32)

TACH4

(16)

TACH3

(8)

TACH2

(4)

TACH1

(2)

TACH0

(1)

FFh

47h

TACH Reading

High Byte

TACH15

(32768)

TACH14

(16384)

TACH13

(8192)

TACH12

(4096)

TACH11

(2048)

TACH10

(1024)

TACH9

(512)

TACH8

(256)

FFh

Where: TACH_COUNT is the

decimal representation of the

TACH[13:0] bits.

[3]

Table 6.17 TACH Reading Low Byte Register

ADDR

R/W

DEFAULT

48h

R/W

TACH Limit

Low Byte

TACH_

FFh

49h

R/W

TACH Limit

High Byte

TACH_

L15

TACH_

L14

TACH_

L13

TACH_

L12

TACH_

L11

TACH_

L10

TACH_

FFh

RPM

5400 000

TACH

_COUNT

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