LM3530 datasheet(31/50 Pages) TI1

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Bit 7

(Not Used)

Bit 6

Data

Bit 5

Data

Bit 4

Data

Bit 0

Data

Bit 1

Data

Brightness Control Register

Address 0xA0, Default Value 0x7F

MSB

LSB

Bit 3

Data

Bit 2

Data

Bit 7

ALSR2A

Bit 6

ALSR2B

Bit 5

ALSR2C

Bit 4

ALSR2D

Bit 0

ALSR1D

Bit 1

ALSR1C

ALS Resistor Select Register

Address 0x41, Default Value 0x00

MSB

LSB

Bit 3

ALSR1A

Bit 2

ALSR1B

LM3530

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SNVS606L – JUNE 2009 – REVISED DECEMBER 2014

Figure 45. ALS Resistor Select Register

Table 9. ALS Resistor Select Register Description (0x41)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

(ALSR2A)

(ALSR2B)

(ALSR2C)

(ALSR2D)

(ALSR1A)

(ALSR1B)

(ALSR1C)

(ALSR1D)

0000 = ALS2 is high impedance

0001 = 13.531 k

Ω (73.9 µA at 1 V)

0001 = 13.531 k

Ω (73.9 µA at 1 V)

0010 = 9.011 k

Ω (111 µA at 1 V)

0010 =9.011 k

Ω (111 µA at 1 V)

0011 = 5.4116 k

Ω (185 µA at 1 V)

0011 = 5.4116 k

Ω (185 µA at 1 V)

0100 = 2.271 k

Ω (440 µA at 1 V)

0100 = 2.271 k

Ω (440 µA at 1 V)

0101 = 1.946 k

Ω (514 µA at 1 V)

0101 = 1.946 k

Ω (514 µA at 1 V)

0110 = 1.815 k

Ω (551 µA at 1 V)

0110 = 1.815 k

Ω (551 µA at 1 V)

0111 = 1.6 k

Ω (625 µA at 1 V)

0111 = 1.6 k

Ω (625 µA at 1 V)

1000 = 1.138 k

Ω (879 µA at 1 V)

1000 = 1.138 k

Ω (879µA at 1 V)

1001 = 1.05 k

Ω (952 µA at 1 V)

1001 = 1.05 k

Ω (952 µA at 1 V)

1010 = 1.011 k

Ω (989 µA at 1 V)

1010 = 1.011 k

Ω (989 µA at 1 V)

1011 = 941

Ω (1.063 mA at 1 V)

1011 = 941

Ω (1.063 mA at 1 V)

1100 = 759

Ω (1.318 mA at 1 V)

1100 = 759

Ω (1.318 mA at 1 V)

1101 = 719

Ω (1.391 mA at 1 V)

1101 = 719

Ω (1.391 mA at 1 V)

1110 = 700

Ω (1.429 mA at 1 V)

1110 = 700

Ω (1.429 mA at 1 V)

1111 = 667

Ω (1.499 mA at 1 V)

1111 = 667

Ω (1.499 mA at 1 V)

8.6.1.6 Brightness Control Register

The Brightness Register (BRT) is an 8-bit register that programs the 127 different LED current levels (Bits [6:0]).

The code written to BRT is translated into an LED current as a percentage of ILED_FULLSCALE as set via the Full-

Scale Current Select bits (General Configuration Register bits [4:2]). The LED current response has a typical

1000:1 dimming ratio at the maximum full-scale current (General Configuration Register bits [4:2] = (111) and

using the exponential weighted dimming curve.

There are two selectable LED current profiles. Setting the General Configuration Register bit 1 to 0 selects the

exponentially weighted LED current response (see Figure 34). Setting this bit to '1' selects the linear weighted

curve (see Figure 35). Table 2 and Table 3 show the percentage Full-Scale LED Current at a given Brightness

Figure 46. Brightness Control Register

Table 10. Brightness Control Register Description (0xA0)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

N/A

Data (MSB)

Data

LED Brightness Data (Bits [6:0]

Exponential Mapping (see Table 2)

Linear Mapping (see Table 3)

0000000 = LEDs Off

0000001 = 0.08% of Full Scale

0000001 = 0.79% of Full Scale

1111111 = 100% of Full Scale

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