LM93 datasheet(62/92 Pages) NSC

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16.0 Registers (Continued)

16.8 SETUP REGISTERS

16.8.1 Register BCh

Special Function Control 1 (Voltage Hysteresis and Fan Control Filter Enable)

Address

Read/

Write

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Default

Value

BCh

R/W

Special Function

Control 1

RES

FCFE2

FCFE1

LCFE2

LCFE1

00h

Bit

Name

R/W

Description

2:0

R/W

Voltage hysteresis control. This determines the amount of hysteresis to be applied to all

voltage limit comparisons. It applies to both high and low limits. One LSB equals one A/D

count, so the actual voltage represented by one LSB depends on the voltage channel.

LCFE1

R/W

Limit Comparison Filter Enable. Setting this bit causes limit comparisons for temperature zone

1 to use the filtered (spike smoothed) temperature instead of the unfiltered temperature.

LCFE2

R/W

Limit Comparison Filter Enable. Setting this bit causes limit comparisons for temperature zone

2 to use the filtered (spike smoothed) temperature instead of the unfiltered temperature.

FCFE1

R/W

Fan Control Filter Enable. Setting this bit causes fan control functions for zone 1 (including

fan boost) to use the filtered (spike smoothed) temperature instead of the unfiltered

temperature.

FCFE2

R/W

Fan Control Filter Enable. Setting this bit causes fan control functions for zone 2 (including

fan boost) to use the filtered (spike smoothed) temperature instead of the unfiltered

temperature.

RES

Reserved

In order for the LCFE1, LCFE2, FCFE1 and FCFE2 bits to work correctly, the ZN1E and ZN2E bits in the Zones 1/2 Spike

Smoothing Control register should be cleared.

Application Note: If hysteresis for voltage limit comparisons is non-zero, special care needs to be taken when changing the

voltage limit registers while a voltage error condition exists. If software relaxes the voltage limits in an attempt to prevent an error

condition, it may be necessary to relax the limits by an amount greater than the hysteresis value and wait several milliseconds

before attempting to clear the error status bit for the given voltage channel. Once the error status bit has been cleared, the desired

limit(s) can be programmed.

LM93 Datasheet(PDF) 62 Page - National Semiconductor (TI)

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