LM93 datasheet(76/92 Pages) NSC

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16.0 Registers (Continued)

16.8.21 Register D0h–D3h

Zone 1 to 4 Base Temperatures

Address

Read/

Write

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Default

Value

D0h

R/W

Zone 1 Base

Temperature

76543210N/D

D1h

R/W

Zone 2 Base

Temperature

76543210N/D

D2h

R/W

Zone 3 Base

Temperature

76543210N/D

D3h

R/W

Zone 4 Base

Temperature

76543210N/D

The value in this register is used as the base in the temperature calculation for the auto fan control look-up table. These registers

use the standard temperature format (8-bit signed data). The look-up table contains the temperature offsets. The offsets are

added to the base temperature to determine the true temperature to be used for each table entry for auto fan control.

16.8.22 Register D4h–DFh

Lookup Table Steps — Zone 1/2 and Zone 3/4 Offset Temperature

Address

Read/

Write

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Default

Value

D4h

R/W

Step 2

Temp Offset

Z3/4_STEP2

Z1/2_STEP2

N/D

D5h

R/W

Step 3

Temp Offset

Z3/4_STEP3

Z1/2_STEP3

N/D

D6h

R/W

Step 4

Temp Offset

Z3/4_STEP4

Z1/2_STEP4

N/D

D7h

R/W

Step 5

Temp Offset

Z3/4_STEP5

Z1/2_STEP5

N/D

D8h

R/W

Step 6

Temp Offset

Z3/4_STEP6

Z1/2_STEP6

N/D

D9h

R/W

Step 7

Temp Offset

Z3/4_STEP7

Z1/2_STEP7

N/D

DAh

R/W

Step 8

Temp Offset

Z3/4_STEP8

Z1/2_STEP8

N/D

DBh

R/W

Step 9

Temp Offset

Z3/4_STEP9

Z1/2_STEP9

N/D

DCh

R/W

Step 10

Temp Offset

Z3/4_STEP10

Z1/2_STEP10

N/D

DDh

R/W

Step 11

Temp Offset

Z3/4_STEP11

Z1/2_STEP11

N/D

DEh

R/W

Step 12

Temp Offset

Z3/4_STEP12

Z1/2_STEP12

N/D

DFh

R/W

Step 13

Temp Offset

Z3/4_STEP13

Z1/2_STEP13

N/D

There are two look up tables of 13 steps (12 offsets), one for Zones 1 and 2 the other for Zones 3 and 4. Each 8-bit offset register

contains the offset temperature for Zones 1 and 2 as well as the offset temperature for Zones 3 and 4. The format for the offsets

is a 4-bit unsigned value, and one LSB = 1˚C.

See the Section 15.10 FAN CONTROL for information on how the base temperature/lookup table should be used for controlling

the PWM output(s).

LM93 Datasheet(PDF) 76 Page - National Semiconductor (TI)

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