Rainbow-electronics LM93 Manual do Utilizador descarregar pdf (Página 64)

16.0 Registers (Continued)

16.8.4 Register BFh PWM Ramp Control

Address

Read/

Write

Name

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

Default

Value

BFh R/W

PWM Ramp

Control

PH_RAMP VRD_RAMP 00h

Bit Name R/W Description

3:0 VRD_RAMP R/W Sets the time delay between ramp steps for the

VRDx_HOT ramp up/ramp down PWM function.

7:4 PH_RAMP R/W Sets the time delay between ramp steps for the

Px_PROCHOT ramp up/ramp down PWM function.

If the time delay between steps is set to 0 ms, the PWM duty cycle goes immediately to 100% instead of ramping up gradually.

VRD_RAMP

or PH_RAMP

Time Delay between

Ramp Steps

0h 0 ms

1h 50 ms

2h 100 ms

3h 150 ms

4h 200 ms

5h 250 ms

6h 300 ms

7h 350 ms

8h 400 ms

9h 450 ms

Ah 500 ms

Bh 550 ms

Ch 600 ms

Dh 650 ms

Eh 700 ms

Fh 750 ms

16.8.5 Register C0h Fan Boost Hysteresis (Zones 1/2)

Address

Read/

Write

Name

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

Default

Value

C0h R/W

Fan Boost

Hysteresis

(Zones 1/2)

H2 H1 44h

Bit Name R/W Description

3:0 H1 R/W Sets the fan boost hysteresis for zone 1

7:4 H2 R/W Sets the fan boost hysteresis for zone 2

If the temperature zone is above fan boost temperature and then drops below the fan boost temperature, the following occurs:

the PWM output remains at 100% until the temperature goes a certain amount below the fan boost temperature. These hysteresis

registers control this amount and can be set anywhere from 0˚C to 15˚C (unsigned).

LM93

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