LM80 datasheet(26/29 Pages) NSC

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Functional Description (Continued)

12.8 Fan Divisor Register/RST_OUT/OS — Address 05h

Power on – <7:4> is 0101, and <3:0>is mapped to VID <3:0>

Bit

Name

Read/Write

Description

FAN1 Mode

Select

Read/Write

A one selects the level sensitive input mode while a zero selects Fan count mode

for the FAN1 input pin.

FAN2 Mode

Select

Read/Write

A one selects the level sensitive input mode while a zero selects Fan count mode

for the FAN2 input pin.

2-3

FAN1 RPM

Control

Read/Write

FAN1 Speed Control.

<3:2> = 00 - divide by 1;

<3:2> = 01 - divide by 2;

<3:2> = 10 - divide by 4;

<3:2> = 11 - divide by 8.

If level sensitive input is selected: >2< = 1 selects and active-low input (An interrupt

will be generated if the FAN2 input is Low), >2< = 0 selects an active-high input (an

interrupt will be generated if the FAN2 input is High).

4-5

FAN2 RPM

Control

Read/Write

FAN2 Speed Control.

<5:4> = 00 - divide by 1;

<5:4> = 01 - divide by 2;

<5:4> = 10 - divide by 4;

<5:4> = 11 - divide by 8.

If level sensitive input is selected: <2> = 1 selects and active-low input (An interrupt

will be generated if the FAN2 input is Low), <2> = 0 selects an active-high input (an

interrupt will be generated if the FAN2 input is High).

OS pin enable

Read/Write

A one enables OS mode on the RST_OUT/OS output pin, while Bit 7 of this register

is set to zero. If bits 6 and 7 of this register are set to zero the RST_OUT/OS pin is

disabled.

RST enable

Read/Write

A one sets the RST_OUT/OS pin in the RST mode. In the RST mode, bit 7 of the

Fan Divisor/RST_OUT/OS Register has to be set to one. If bits 6 and 7 of this

12.9 OS Configuration/Temperature Resolution Register — Address 06h

Power on default Serial Bus address <7:0> = 0000 0001 binary

Bit

Name

Read/Write

Description

OS status

Read only

Status of the OS.This bit mirrors the state of the RST_OUT/OS pin when in the OS

mode.

OS Polarity

Read/Write

A zero selects OS to be active-low, while a one selects OS to be active high. OS is

an open-drain output.

OS mode select

Read/Write

A one selects the one time interrupt mode for OS, while a zero selects comparator

mode for OS. (See in Section 7.0)

Temperature

Resolution

Control

Read/Write

A zero selects the default 8-bit plus sign resolution temperature conversions while a

one selects 11-bit plus sign resolution temperature conversions. 8-bit plus sign

conversions time is approximately 100 ms, while 11-bit plus sign conversion time is

approximately 2 seconds.

4-7

Temp [3:0]

Read/Write

The lower nibble (4 LSBs) of the 11-bit plus sign temperature data. <4> = Temp

[0] (nibble LSB, 0.0625˚C), <5> = Temp [1], <6> = Temp [2], <7> = Temp 3

(nibble MSB, 0.5˚C). For 8-bit plus sign temperature resolution, <7> = Temp [0]

(LSB, 0.5˚C) while <4:6> are undefined.

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