LM3549

www.ti.com

SNVS640A – AUGUST 2010 – REVISED MAY 2013

0Bh IB1_LSB and 0Ch IB1_MSB

Blue LED current setting for Bank 1. IB1_LSB holds the eight least significant bits and IB1_MSB the two most

significant bits.

0Dh IR2_LSB and 0Eh IR2_MSB

Red LED current setting for Bank 2. IR2_LSB holds the eight least significant bits and IR2_MSB the two most

significant bits.

0Fh IG2_LSB and 10h IG2_MSB

Green LED current setting for Bank 2. IG2_LSB holds the eight least significant bits and IG2_MSB the two most

significant bits.

11h IB2_LSB and 12h IB2_MSB

Blue LED current setting for Bank 2. IB2_LSB holds the eight least significant bits and IB2_MSB the two most

significant bits.

13h FADER

Master fader control register. Can be used to control the total brightness of the LEDs if MFE is enabled.

14h CTRL

Control register. Controls many of the LM3549 features.

BIT[1:0] PWM and MFE

Control register bits [1:0] can be used to enable master control or PWM brightness control.

MFE

PWM

BRIGHTNESS CONTROL

0

0

No brightness control

0

1

PWM input

1

0

Master input

1

1

PWM input

BIT[3:2] TIME OUT[1:0]

Selects how long device stays in active mode after all x_EN controls have been set low

BIT

TIME OUT

0

0

125 ms

0

1

250 ms

1

0

500 ms

1

1

1s

BIT[5:4] SOFT START[1:0]

Enables soft start feature and selects soft start time.

BIT

SOFT START TIME

0

0

disabled

0

1

0.5s

1

0

1s

1

1

2s

Copyright © 2010–2013, Texas Instruments Incorporated

Submit Documentation Feedback

17

Product Folder Links: LM3549