LM3535 datasheet(14/26 Pages) NSC

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different zone brightness registers (Addresses 0x70 to

0x74).

•

ALS-EN: Enables ALS monitoring. Writing a '1' enables

the ALS monitoring circuitry and a '0' disables it. This

feature can be enabled without having the current sinks or

charge pump active. The ALS value is updated in register

0x40 (ALS Zone Register)

•

ALSF: ALS Interrupt Enable. Writing a '1' sets the D1B/INT

pin to the ALS interrupt pin and writing a '0' (default) sets

the pin to a BankB current sink.

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FIGURE 6. Options Register

Internal Hex Address: 0x30

•

RD0-RD2: Diode Current Ramp Down Step Time. : ‘000’

= 6µs, ‘001’ = 0.77ms, ‘010’ = 1.5ms, ‘011’ = 3ms, ‘100’ =

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

•

RU0-RU2: Diode Current Ramp Up Step Time. : ‘000’ =

6µs, ‘001’ = 0.77ms, ‘010’ = 1.5ms, ‘011’ = 3ms, ‘100’ =

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

•

GT0-GT1: Gain Transition Filter. The value stored in this

transition in the event of an input line step. Filter Times =

‘00’ = 3-6ms, ‘01’ = 0.8-1.5ms, ‘10’ = 20µs, On

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

USE

The Ramp-Up and Ramp-Down times follow the following

equations: T

RAMP = (NStart - NTarget) × Ramp-Step Time

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FIGURE 7. 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 cur-

rent 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 the following equation

where N = BRC = the decimal value stored in either the BankA Bright-

ness Register or the five different ALS Zone Brightness Registers:

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