LM93 datasheet(57/92 Pages) NSC

57 / 92 page

16.0 Registers (Continued)

16.7 LIMIT REGISTERS

16.7.1 Registers 78–7Fh

Temperature Limit Registers

Address

Read/

Write

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Default

Value

78h

R/W

Processor 1 (Zone1)

Low Temp

76543210

80h

79h

R/W

Processor 1 (Zone1)

High Temp

76543210

80h

7Ah

R/W

Processor 2 (Zone2)

Low Temp

76543210

80h

7Bh

R/W

Processor 2 (Zone2)

High Temp

76543210

80h

7Ch

R/W

Internal (Zone3)

Low Temp

76543210

80h

7Dh

R/W

Internal (Zone3)

High Temp

76543210

80h

7Eh

R/W

External Digital (Zone4)

Low Temp

76543210

80h

7Fh

R/W

External Digital (Zone4)

High Temp

76543210

80h

If an external temperature input or the internal temperature sensor either exceeds the value set in the high limit register or falls

below the value set in the low limit register, the corresponding bit in the B_ and H_Error Status 1 register is set automatically by

the LM93. For example, if the temperature read from the Remote1− and Remote1+ inputs exceeds the Processor (Zone1) High

Temp register limit setting, the ZN1_ERR bit in both B_Error Status 1 and H_Error Status 1 registers is set. The temperature limits

in these registers is represented as 8 bit, 2’s complement, signed numbers in Celsius.

If any high temp limit register is set to 80h then the B_ and H_Error Status register bit for that temperature channel is masked.

16.7.2 Registers 80–83h

Fan Boost Temperature Registers

Address

Read/

Write

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Default

Value

80h

R/W

Fan Boost Temp

Zone 1

76543210

3Ch

81h

R/W

Fan Boost Temp

Zone 2

76543210

3Ch

82h

R/W

Fan Boost Temp

Zone 3

76543210

23h

83h

R/W

Fan Boost Temp

Zone 4

76543210

23h

If any thermal zone exceeds the temperature set in the Fan Boost Limit register, both of the PWM outputs are set to 100%. The

fan boost function takes precedence over manual override. This is a safety feature that attempts to cool the system if there is a

potentially catastrophic thermal event. If set to 7Fh and the fan control temperature resolution is 1˚C, the feature is disabled.

Default = 60˚C = 3Ch for zones 1 and 2

Default = 35˚C = 23h for zones 3 and 4

The temperature has to fall the number of degrees specified in the Fan Boost Hysteresis registers, below this temperature to

cause the PWM outputs to return to normal operation.

LM93 Datasheet(PDF) 57 Page - National Semiconductor (TI)

LM93 Datasheet(HTML) 57 Page - National Semiconductor (TI)

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