AS3675 datasheet(44/81 Pages) AMSCO

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AS3675

Datasheet - D e ta i l e d D e s c r i p t i o n

PWM Generator Registers

Table 57. Pwm control

Addr: 16h

Pwm control

This register controls PWM generator

Bit

Bit Name

Default Access

Description

2:1

pwm_dim_mode

00b

R/W

Selects the dimming mode

00b

no dimming; actual content of register

pwm_code is used for pwm generator

01b

logarithmic up dimming (codes are increased).

Start value is actual pwm_code

10b

logarithmic down dimming (codes are

decreased). Start value is actual pwm_code;

switch off the dimmed current source after

dimming is finished to avoid unnecessary

quiescent current

11b

5:3

pwm_dim_speed

000b

R/W

Defines dimming speed by increase/decrease pwm_code

000b

by 1/4

th every 50 msec (total dim time 1.0s)

001b

by 1/8

th every 50 msec (total dim time 1.9s)

010b

by 1/4

th every 25 msec (total dim time 0.5s)

011b

by 1/8

th every 25 msec (total dim time 0.95s)

100b

by 1/4

th every 5 msec (total dim time 100ms)

101b

by 1/8

th every 5 msec (total dim time 190ms)

110b

by 1/4

th every 2.5 msec (total dim time 50ms)

111b

by 1/8

th every 2.5 msec (total dim time 95ms)

Table 58. pwm code

Addr: 17h

pwm code

This register controls the Pwm code.

Bit

Bit Name

Default Access

Description

7:0

pwm_code

00b

R/W

Selects the PWM code

00h

0% duty cycle

....

FFh

100% duty cycle

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