Options Register

Register Address: 0x30

GT1

bit7

GT0

bit6

RD2

bit5

RD1

bit4

RD0

bit3

RU2

bit2

RU1

bit1

RU0

bit0

MSB

LSB

Configuration Register

Register Address: 0x20

ALSF

bit7

ALS-EN

bit6

ALS-ENB

bit5

ALS-ENA

bit4

62A

bit3

53A

bit2

PWM-P

bit1

PWM-EN

bit0

ENC

bit7

EN1B

bit6

EN62

bit5

EN53

bit4

EN4A

bit3

EN3A

bit2

EN2A

bit1

EN1A

bit0

MSB

LSB

Control Register

Register Address: 0x10

14

LM3535

SNVS598B – AUGUST 2010 – REVISED MARCH 2018

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Figure 20. Diode Enable Register Description

Internal Hex Address: 0x10

Each ENx Bit controls the state of the corresponding current sink. Writing a 1 to these bits enables the current

sinks. Writing a 0 disables the current sinks. In order for current to begin flowing through the BankA current

sinks, the brightness codes stored in either the BankA Brightness register or the ALS Brightness registers (with

ALS enabled) must be non-zero. The BankA current sinks can be disabled in two different manors. Writing 0 to

the ENx bits when the current sinks are active will disable the current sinks without going through the ramp down

sequence. Additionally, setting the BankA brightness code to 0 when the current sinks are active (ENx = 1) does

force the diode current to ramp down. All ramping behavior is tied to the BankA Brightness or ALS Brightness

Register settings. Any change in these values causes the LM3535 brightness state machine to ramp the diode

current.

Writing a '1 to ENC, EN1B, EN62 and EN53 (when EN62 and EN53 are assigned to BankB) by default enables

the corresponding current sinks and drive the LEDs to the current value stored in the BankB and BankC

brightness registers. Writing a 0 to these bits immediately disables the current sinks.

The ENC and EN1B bits are ignored if the D1C/ALS pin is configured as an ALS input and if the D1B/INT is

configured as an interrupt flag.

Figure 21. Configuration Register Description

Internal Hex Address:0x20

•

PWM-EN: PWM Input Enable. Writing a 1 = Enable, and a 0 = Ignore (default).

•

PWM-P: PWM Input Polarity. Writing a 0 = Active High (default) and a 1 = Active Low.

•

53A: Assign D53 diode to BankA. Writing a 0 assigns D53 to BankB (default) and a 1 assigns D53 to BankA.

•

62A: Assign D62 diode to BankA. Writing a 0 assigns D62 to BankB (default) and a 1 assigns D62 to BankA.

•

ALS-ENA: Enable ALS on BankA. Writing a 1 enables ALS control of diode current and a 0 (default) forces

the BankA current to the value stored in the BankA brightness register. The ALS-EN bit must be set to a 1 for

the ALS block to control the BankA brightness.

•

ALS-ENB: Enable ALS on BankB. Writing a 1 enables ALS control of diode current and a 0 (default) forces

the BankB current to the value stored in the BankB brightness register. The ALS-EN bit must be set to a 1 for

the ALS block to control the BankB brightness. The ALS function for BankB is different than bankA in that the

ALS will only enable and disable the BankB diodes depending on the ALS zone chosen by the user. BankA

utilizes the 5 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.

Figure 22. Options Register

Internal Hex Address: 0x30