Texas Instruments LM3549 Evaluation Board LM3549SQEV/NOPB LM3549SQEV/NOPB Datenbogen
Produktcode
LM3549SQEV/NOPB
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.
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.
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.
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.
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
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