EMC2101-R-ACZL-TR datasheet(32/57 Pages) SMSC

32 / 57 page

SMBus Fan Control with 1°C Accurate Temperature Monitoring

Datasheet

Revision 2.54 (06-16-09)

SMSC EMC2101

DATASHEET

Note 6.1

The Look Up Table Registers are made Read Only if the PWM Program bit (bit 5) in PWM

Configuration Register (4Ah) is set.

6.1

Data Read Interlock

When the External Diode High Byte Register is read, the External Diode Low byte is copied into an

internal ‘shadow’ register. The user is free to read the low byte at any time and be guaranteed that it

will correspond to the previously read high byte. Regardless if the low byte is read or not, reading from

an External Diode High Byte Register will automatically refresh this stored low byte data.

When the TACH Reading Low Byte Register is read, the TACH Reading high byte is copied into an

internal ‘shadow’ register. The user is free to read the high byte at any time and be guaranteed that it

will correspond to the previously read low byte. Regardless if the high byte is read or not, reading from

the TACH Reading Low Byte Register will automatically refresh this stored high byte data.

6.2

The registers are described in detail below. A bit entry of a ‘-’ indicates that the bit is not used and will

always read 0.

57h

R/W (See

Note 6.1)

Lookup Table Fan Setting 4

Associated Fan Setting for

Temp Setting 4

3Fh

Page 46

58h

R/W (See

Note 6.1)

Lookup Table Temp Setting 5

Look Up Table

Temperature Setting 5

7Fh

Page 46

59h

R/W (See

Note 6.1)

Lookup Table Fan Setting 5

Associated Fan Setting for

Temp Setting 5

3Fh

Page 46

5Ah

R/W (See

Note 6.1)

Lookup Table Temp Setting 6

Look Up Table

Temperature Setting 6

7Fh

Page 46

5Bh

R/W (See

Note 6.1)

Lookup Table Fan Setting 6

Associated Fan Setting for

Temp Setting 6

3Fh

Page 46

5Ch

R/W (See

Note 6.1)

Lookup Table Temp Setting 7

Look Up Table

Temperature Setting 7

7Fh

Page 46

5Dh

R/W (See

Note 6.1)

Lookup Table Fan Setting 7

Associated Fan Setting for

Temp Setting 7

3Fh

Page 46

5Eh

R/W (See

Note 6.1)

Lookup Table Temp Setting 8

Look Up Table

Temperature Setting 8

7Fh

Page 46

5Fh

R/W (See

Note 6.1)

Lookup Table Fan Setting 8

Associated Fan Setting for

Temp Setting 8

3Fh

Page 46

BFh

R/W

Averaging Filter

Selects averaging function

for external diode

00h

Page 47

FDh

Product ID

16h or 28h

Page 48

FEh

Manufacturer ID

SMSC

5Dh

Page 48

FFh

Revision Register

REV

01h

Page 48

Table 6.1 Register Set in Hexadecimal Order (continued)

ADDRESS

R/W

FUNCTION

DEFAULT

VALUE

PAGE

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