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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

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