LM3535 datasheet(13/26 Pages) NSC

13 / 26 page

I2C COMPATIBLE CHIP ADDRESS

The 7-bit chip address for LM3535 is 111000, or 0x38.

INTERNAL REGISTERS OF LM3535

Internal Hex

Address

Power On Value

Diode Enable

0x10

0000 0000 (0x00)

Configuration

0x20

0000 0000 (0x00)

Options

0x30

0000 0000 (0x00)

ALS Zone

Readback

0x40

1111 0000 (0xF0)

ALS Control

0x50

1 ALS

Version

0000 0011 (0x03)

2 ALS

Version

0000 0000 (0x00)

ALS Resistor

0x51

0000 0000 (0x00)

ALS Select

0x52

LM3535-2ALS

Only

1111 0001 (0xF1)

ALS Zone

Boundary #0

0x60

0011 0011 (0x33)

ALS Zone

Boundary #1

0x61

0110 0110 (0x66)

ALS Zone

Boundary #2

0x62

1001 1001 (0x99)

ALS Zone

Boundary #3

0x63

1100 1100 (0xCC)

ALS Brightness

Zone #1

0x70

1001 1001 (0x99)

ALS Brightness

Zone #2

0x71

1011 0110 (0xB6)

ALS Brightness

Zone #3

0x72

1100 1100 (0xCC)

ALS Brightness

Zone #4

0x73

1110 0110 (0xE6)

ALS Brightness

Zone #5

0x74

1111 1111 (0xFF)

Group A

Brightness

Control Register

0xA0

1000 0000 (0x80)

Group B

Brightness

Control Register

0xB0

1100 0000 (0xC0)

Group C

Brightness

Control Register

0xC0

1111 1000 (0xF8)

30082404

FIGURE 4. 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. Writ-

ing 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 bright-

ness code to '0' when the current sinks are active (ENx = '1')

does force the diode current to ramp down. All ramping be-

havior is tied to the BankA Brightness or ALS Brightness

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 will enable the cor-

responding 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.

30082405

FIGURE 5. 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

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

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

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