Rainbow-electronics LM85 Manual do Utilizador descarregar pdf (Página 17)

Functional Description (Continued)

This register becomes Read Only when the Ready/Lock/Start/Override register Lock bit is set. Any further attempts to write to this

register shall have no effect. After power up the default value is used whenever the Ready/Lock/Start/Override register Start bit

is cleared even though modifications to this register are possible.

Bits [7:5] Zone/Mode

Bits [7:5] of the Fan Configuration registers associate each fan with a temperature sensor. When in Auto Fan Mode the fan will

be assigned to a zone, and its PWM duty cycle will be adjusted according to the temperature of that zone. If ‘Hottest’ option is

selected (101 or 110), the fan will be controlled by the hottest of zones 2 and 3, or of zones 1, 2, and 3. When in manual control

mode, the Current PWM duty registers (30h-32h) become Read/Write. It is then possible to control the PWM outputs with

software by writing to these registers. When the fan is disabled (100) the corresponding PWM output should be driven low (or

high, if inverted).

Zone 1: External Diode 1 (processor)

Zone 2: Internal Sensor

Zone 3: External Diode 2

TABLE 4. Fan Zone Setting

ZON[2:0] Fan Configuration

000 Fan on zone 1 auto

001 Fan on zone 2 auto

010 Fan on zone 3 auto

011 Fan always on full

100 Fan disabled

101 Fan controlled by hottest of zones 2, 3

110 Fan controlled by hottest of zones 1, 2, 3

111 Fan manually controlled (Test Mode)

Bit [4] PWM Invert

Bit [4] inverts the PWM output. If set to 0, 100% duty cycle will yield an output that is always high. If set to 1, 100% duty cycle

will yield an output that is always low.

Bit [3] Reserved

Bits [2:0] Spin Up

Bits [2:0] specify the ‘spin up’ time for the fan. When a fan is being started from a stationary state, the PWM output is held at 100%

duty cycle for the time specified in the table below before scaling to a lower speed.

TABLE 5. Fan Spin-Up Register

SPIN[2:0] Spin Up Time

000 0 sec

001 100 ms

010 250 ms

011 400 ms

100 700 ms

101 1000 ms

110 2000 ms

111 4000 ms

4.15 Registers 5F-61h: Auto Fan Speed Range, PWM Frequency

Address

Read/

Write

Name

Bit 7

(MSB)

Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

(LSB)

Default

Value

Lock?

5Fh R/W Zone1 Range/Fan1

Frequency

RAN3 RAN2 RAN1 RAN0 RES FRQ2 FRQ1 FRQ0 C4h U

60h R/W Zone2 Range/Fan2

Frequency

RAN3 RAN2 RAN1 RAN0 RES FRQ2 FRQ1 FRQ0 C4h U

61h R/W Zone3 Range/Fan3

Frequency

RAN3 RAN2 RAN1 RAN0 RES FRQ2 FRQ1 FRQ0 C4h U

LM85

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