LM93 datasheet(64/95 Pages) TI1

64 / 95 page

LM93

SNAS210E – DECEMBER 2003 – REVISED MARCH 2013

www.ti.com

3.17.8 SETUP REGISTERS

3.17.8.1 Register BCh

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

Read/

Default

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Address

Write

Name

Value

Special

FCFE2

LCFE2

LCFE1

BCh

R/W

Function

RES

FCFE1

00h

Control 1

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.

3.17.8.2 Register BDh

Special Function Control 2 (Smart Tach Mode Enable and Fan Control

Temperature Resolution Control)

Read/

Default

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Address

Write

Name

Value

Special

RES

ZN12

STE4

STE3

STE2

STE1

ZN34

BDh

R/W

Function

RES

_RS

00h

_RS

Control 2

Bit

Name

R/W

Description

STE1

R/W

Enable Smart Tach for Tach 1

STE2

R/W

Enable Smart Tach for Tach 2

STE3

R/W

Enable Smart Tach for Tach 3

STE4

R/W

Enable Smart Tach for Tach 4

ZN12_RS

R/W

When this bit is set, the auto fan control will use 0.5°C of resolution for zones 1 and

ZN34_RS

R/W

When this bit is set, the auto fan control will use 0.5°C of resolution for zones 3 and

RES

Reserved

RES

Reserved

Functional Description

Submit Documentation Feedback

Product Folder Links: LM93

LM93 Datasheet(PDF) 64 Page - Texas Instruments

LM93 Datasheet(HTML) 64 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95

Datasheet Download

Link URL