LM3537

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SNVS634B – JUNE 2011 – REVISED MAY 2013

Internal Registers of LM3537

The LM3537 is controlled by a set of registers through the two-wire serial interface port. Table 5 below lists

device registers and their addresses together with a short description.

Table 5. Control Register Map

Hex

Read/W

Default Value

Register Name

Bit(s)

Bit Mnemonic and Description

Addr.

rite

After Reset

00

MASTER ENABLE

[2]

R/W

xxxxx0xx

group_A_en

Master enable for all the LEDs, which are assigned to group A. '1' =

LEDs ON '0' = LEDs OFF.

[1]

R/W

xxxxxx0x

group_B_en

Master enable for all the LEDs, which are assigned to group B. '1' =

LEDs ON '0' = LEDs OFF.

[0]

W

xxxxxxx0

softw_rst

Writing = '1' to this register bit resets all the registers to factory

defaults. After writing, this bit is forced back to '0' automatically.

10

DIODE ENABLE

[7]

R/W

0xxxxxxx

enD8

ON/OFF Control for D8 output

[6]

R/W

x0xxxxxx

enD7

ON/OFF Control for D7 output

[5]

R/W

xx0xxxxx

enD6

ON/OFF Control for D6 output

[4]

R/W

xxx0xxxx

enD5

ON/OFF Control for D5 output

[3]

R/W

xxxx0xxx

enD4

ON/OFF Control for D4 output

[2]

R/W

xxxxx0xx

enD3

ON/OFF Control for D3 output

[1]

R/W

xxxxxx0x

enD2

ON/OFF Control for D2 output

[0]

R/W

xxxxxxx0

enD1

ON/OFF Control for D1 output

20

CONFIGURATION

[7]

R/W

0xxxxxxx

D7_int

Enables the Interrupt Pin. 1 = interrupt output enabled. 0 = interrupt

output disabled, LED driver operation. Reading the 0x40 register

clears the interrupt.

[6]

R/W

x0xxxxxx

lin

Selects between linear and exponential dimming curve. Effective for

Group A only. 1 = linear dimming curve. 0 = exponential dimming

curve.

[5]

R/W

xx1xxxxx

D8_A

Assign D8 diode to Group A Writing a '1' assigns D8 to BankA

(default) and a '0' assigns D8 to Group B.

[4]

R/W

xxx1xxxx

D7_A

Assign D7 diode to Group A Writing a '1' assigns D7 to BankA

(default) and a '0' assigns D7 to Group B.

[3]

R/W

xxxx1xxx

D6_A

Assign D6 diode to Group A Writing a '1' assigns D6 to BankA

(default) and a '0' assigns D6 to Group B.

[2]

R/W

xxxxx1xx

D5_A

Assign D5 diode toGroup A . Writing a '1' assigns D5 to BankA

(default) and a '0' assigns D5 to Group B.

[1]

R/W

xxxxxx0x

pwm_p

PWM input polarity. Writing a '0' = active high (default) and a '1' =

active low.

[0]

R/W

xxxxxxx0

pwm_en

PWM input enable. Writing a '1' = Enable, and a '0' = Ignore

(default).

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