LM3530 datasheet(30/50 Pages) TI1

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Bit 7

(Not Used)

Bit 6

(Not Used)

Bit 5

(Not Used)

Bit 4

(Not Used)

Bit 0

Zone Data

Bit 1

Zone Data

ALS Zone Information Register

Address 0x40, Default Value 0x00

MSB

LSB

Bit 3

Zone

Boundry

Change

Flag

Bit 2

Zone Data

Bit 7

Not Used

Bit 6

Not Used

Bit 5

BRRI2

Bit 4

BRRI1

Bit 0

BRRD0

Bit 1

BRRD1

Brightness Ramp Rate Register

Address 0x30, Default Value 0x00

MSB

LSB

Bit 3

BRRI0

Bit 2

BRRD2

LM3530

SNVS606L – JUNE 2009 – REVISED DECEMBER 2014

www.ti.com

8.6.1.3 Brightness Ramp Rate Register

The Brightness Ramp Rate Register controls the rate of rise or fall of the LED current. Both the rising rate and

falling rate are independently adjustable Figure 43 and Table 7 describe the bit settings.

Figure 43. Brightness Ramp Rate Register

Table 7. Brightness Ramp Rate Register Description (0x30)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

(BRRI2)

(BRRI1)

(BRRI0)

(BRRD2)

(BRRD1)

(BRRD0)

N/A

000 = 8 µs/step (1.106 ms from 0 to Full Scale)

000 = 8 µs/step (1.106 ms from Full Scale to 0)

001 = 1.024 ms/step (130 ms from 0 to Full Scale)

001 = 1.024 ms/step (130 ms from Full Scale to 0)

010 = 2.048 ms/step (260 ms from 0 to Full Scale)

010 = 2.048 ms/step (260 ms from Full Scale to 0)

011 = 4.096 ms/step (520 ms from 0 to Full Scale)

011 = 4.096 ms/step (520 ms from Full Scale to 0)

100 = 8.192 ms/step (1.04 s from 0 to Full Scale)

100 = 8.192 ms/step (1.04 s from Full Scale to 0)

101 = 16.384 ms/step (2.08 s from 0 to Full Scale)

101 = 16.384 ms/step (2.08 s from Full Scale to 0)

110 = 32.768 ms/step (4.16 s from 0 to Full Scale)

110 = 32.768 ms/step (4.16 s from Full Scale to 0)

111 = 65.538 ms/step (8.32 s from 0 to Full Scale)

111 = 65.538 ms/step (8.32 s from Full Scale to 0)

8.6.1.4 ALS Zone Information Register

The ALS Zone Information Register is a read-only register that is updated every time the active ALS input(s)

detect that the ambient light has changed to a new zone as programmed in the Zone Boundary Registers. See

Zone Boundary Register description. A new update to the ALS Zone Information Register is signaled by the INT

output going from high to low. A read-back of the ALS Zone Information Register will cause the INT output to go

open-drain again. The Zone Change Flag (bit 3) is also updated on a Zone change and cleared on a read back

of the ALS Zone Information Register. Figure 44 and Table 8 detail the ALS Zone Information Register.

Figure 44. ALS Zone Information Register

Table 8. ALS Zone Information Register Description (0x40)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

(Zone Boundary Change Flag)

(Z2)

(Z1)

(Z0)

N/A

1 = the active ALS input has

000 = Zone 0

changed to a new ambient light

001 = Zone 1

zone as programmed in the

010 = Zone 2

Zone Boundary Registers (ZB0

011 = Zone 3

-ZB3)

100 = Zone 4

0 = no zone change

8.6.1.5 ALS Resistor Select Register

The ALS Resistor Select Register configures the internal resistance from either the ALS1 or ALS2 input to GND.

Bits [3:0] program the input resistance at the ALS1 input and bits [7:4] program the input resistance at the ALS2

input. With bits [3:0] set to all zeroes the ALS1 input is high impedance. With bits [7:4] set to all zeroes the ALS2

input is high impedance.

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