AS3689 datasheet(47/72 Pages) AMSOSRAM

47 / 72 page

AS3689

austriami crosyst ems

Datasheet, Confidential

www.austriamicrosystems.com (mlg, ptr)

Revision 1.0.2 / 20070115

45 - 70

7.4.8.2 PWM Generator Registers

Addr: 16h

Pwm control

This register controls PWM generator

Bit

Bit Name

Default

Access

Description

pwm_mode

R/W

Selects the PWM source

0b = Use external PWM from GPIO; also set pwm_gpio to 1

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_gpio

R/W

Selects the PWM source

0b = default state

1b = If the external pwm from GPIO is used set to bit to ‘1’

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 = Always 0

...

FFh = Always 1

Addr: 30h

Adder Current 1

This register defines the current which can be added to CURR1, CURR41, RGB1

Bit

Bit Name

Default

Access

Description

7:0

adder_current1

00b

R/W

Selects the added current value – do not exceed together

with currX_current the internal 8 Bit range (see text)

00h = 0 (represents 0mA)

...

FFh = 255 (represents 38.25mA)

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