C11 datasheet(46/72 Pages) AMSOSRAM

46 / 72 page

AS3688

austriami crosyst ems

Datasheet, Confidential

www.austriamicrosystems.com (ptr,tje)

Revision 1.1.1 / 20060707

44 - 70

Decrease by 1/4th every

step

Decrease by 1/8th every

step

Seconds

Seconds Seconds

Seconds

Step

%Dimming

PWM

%Dimming

PWM

50msec/

Step

25msec/

Step

5msec/

Step

2,5msec/

Step

1,2

1,75s

0,88s

0,175s

0,088s

0,8

1,80s

0,90s

0,180s

0,090s

0,4

1,85s

0,93s

0,185s

0,093s

0,0

1,90s

0,95s

0,190s

0,095s

7.4.8.2 PWM Generator Registers

Pwm control

Addr: 16h

This register controls PWM generator

Bit

Bit Name

Default

Access

Description

pwm_mode

R/W

Selects the PWM source

0b = Use external PWM from GPIO0 or GPIO2

(defined by pwm_gpio2)

1b = Use internal PWM (default)

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 = NA

5:3

pwm_dim_speed

000b

R/W

Defines dimming speed by increase/descrease 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)

pwm_gpio2

R/W

Selects the PWM source

0b = Use GPIO0 for external pwm

1b = Use GPIO2 for external pwm

Pwm code

Addr: 17h

This register controls the Pwm code.

Bit

Bit Name

Default

Access

Description

7:0

pwm_code

00b

R/W

Selects the PWM code

00h = Always 0

...

FFh = Always 1

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