Rainbow-electronics LM93 Manual do Utilizador descarregar pdf (Página 72)

16.0 Registers (Continued)

16.8.15 Register CAh PWM1 Control 3

Address

Read/

Write

Name

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

Default

Value

CAh R/W

PWM1

Control 3

SU_DUR RES SU_DC 00h

Bit Name R/W Description

3:0 SU_DC R/W This field sets the duty cycle that will be used

whenever PWM1 experiences a Spin-Up cycle. This

field accepts 16 possible values that are mapped to

duty cycles according the table in the Auto-Fan

Control section. Setting this field to 0h will effectively

disable Spin-Up.

4 RES R Reserved

7:5 SU_DUR R/W Sets the Spin-Up duration for PWM1.

Bits 7:5 configure the spin-up duration. When the duty cycle of PWM1 changes from zero to a non-zero value, the spin-up

sequence is activated for the specified amount of time. The available settings are defined according to this table:

SU_DUR Spin-Up Time

0h Spin-up disabled

1h 100 ms

2h 250 ms

3h 400 ms

4h 700 ms

5h 1000 ms

6h 2000 ms

7h 4000 ms

16.8.16 Register CBh Special Function PWM1 Control 4

Address

Read/

Write

Name

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

Default

Value

CBh R/W

Special Function

PWM1 Control 4

RES RES RES RES RES FREQ1 00h

Bit Name R/W Description

2:0 FREQ1 R/W PWM1 frequency control. Setting this value controls

the frequency of the PWM1 output according to the

table below.

7:3 RES R Reserved

FREQ1 or FREQ2

Frequency of PWM1

or PWM2 (Hz)

0h 22500

1h 96

2h 84

3h 72

4h 60

5h 48

6h 36

7h 12

LM93

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