ILED (mA) | 25 x 0.85

[44 ± {(N+1)/2.91}]

Or

BRC (#) | 127+17.9 x LN(ILED(mA)/25 mA)

1

bit7

1

bit6

1

bit5

1

bit4

1

bit3

D1C2

bit2

D1C1

bit1

D1C0

bit0

MSB

LSB

DxC Brightness Control

Register Address: 0xC0

MSB

LSB

DxB Brightness Control

Register Address: 0xB0

1

bit7

1

bit6

ALSZT2

bit5

ALSZT1

bit4

ALSZT0

bit3

DxB2

bit2

DxB1

bit1

DxB0

bit0

1

bit7

DxA6

bit6

DxA5

bit5

DxA4

bit4

DxA3

bit3

DxA2

bit2

DxA1

bit1

DxA0

bit0

MSB

LSB

DxA Brightness Control

Register Address: 0xA0

15

LM3535

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SNVS598B – AUGUST 2010 – REVISED MARCH 2018

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•

RD0-RD2: Diode Current Ramp Down Step Time. : ‘000’ = 6 µs, ‘001’ = 0.77 ms, ‘010’ = 1.5 ms, ‘011’ = 3

ms, ‘100’ = 6 ms, ‘101’ = 12 ms, ‘110’ = 25ms, ‘111’ = 50ms

•

RU0-RU2: Diode Current Ramp Up Step Time. : ‘000’ = 6 µs, ‘001’ = 0.77 ms, ‘010’ = 1.5 ms, ‘011’ = 3 ms,

‘100’ = 6 ms, ‘101’ = 12 ms, ‘110’ = 25ms, ‘111’ = 50ms

•

GT0-GT1: Gain Transition Filter. The value stored in this register determines the filter time used to make a

gain transition in the event of an input line step. Filter times = ‘00’ = 3-6 ms, ‘01’ = 0.8-1.5 ms, ‘10’ = 20 µs,

On LM3535-2ALS, '11' = 1µs, On LM3535, ‘11’ = DO NOT USE

The Ramp-Up and Ramp-Down times follow the equatios: TRAMP = (NStart – NTarget) × Ramp-Step Time

Figure 23. Brightness Control Register Description

Internal Hex Address: 0xa0 (Groupa), 0xb0 (Groupb), 0xc0 (Groupc)

NOTE

DxA6-DxA0: Sets Brightness for DxA pins (GroupA). 1111111 = Fullscale. Code 0 in this

register disables the BankA current sinks.

DxB2-DxB0: Sets Brightness for DxB pins (GroupB). 111 = Fullscale

ALSZT2-ALSZT0: Sets the Brightness Zone boundary used to enable and disable BankB

diodes based upon ambient lighting conditions.

DxC2-DxC0: Sets Brightness for D1C pin. 111 = Fullscale

The BankA Current can be approximated by Equation 1 where N = BRC = the decimal

value stored in either the BankA Brightness Register or the five different ALS Zone

Brightness Registers:

(1)