15

Atmel LED Driver-MSL3082

* Read-only registers

Register Power-up Defaults

Register power-up default values are shown in Table 4.

REGISTER NAME

AND ADDRESS

POWER-UP CONDITION

REGISTERS INITIALIZED

FROM EEPROM

REGISTER DATA

D7 D6 D5 D4 D3 D2 D1 D0

HEX

0x00

CONTROL

All LED strings drive outputs are enabled

1

1

1

1

1

1

1

1

FF

0x02 POWERCTRL

String phase delay enabled

Efficiency Optimizer feedback output enabled

Direct PWM disabled

String open circuit detection enabled

String short circuit detection enabled

Device awake

0

1

1

1

0

1

1

1

77

0x03

OSCCTRL

Internal oscillator f

0

0

0

0

0

1

0

0

04

0x04

OTTEMP

Over-temperature threshold is 90°C

0

1

0

1

1

0

1

0

5A

0x05

SYSTEMP

System temperature set to 30°C

0

0

0

1

1

1

1

0

1E

0x06

OTSLOPE

Over-temperature slope set to 50°C

0

0

1

1

0

0

1

0

32

0x08

PWMCTRL

PWM operation enabled

String on-times truncated at end of frame

GSC low frequency fault detection disabled

PHI high frequency fault detection disabled

Over-temperature derating of string on times enabled

PWM frame synchronized to rising edge at PHI input

GINT global intensity control enabled

GSC input frequency division disabled

0

1

1

1

0

0

0

1

71

0x0B

GINT

Global intensity PWM duty cycle GINT = 15/64 = 23.4%

0

0

0

0

1

1

1

1

0F

0x0C

GSCDIV

GSC input frequency is divided by 2^0

0

0

0

0

0

0

0

0

00

0x0D

PHIMUL

PHI input frequency is multiplied by 1

0

0

0

0

0

0

0

1

01

0x0E

STR03FBO

All strings are monitored by the Efficiency Optimizer

1

1

1

1

1

1

1

1

FF

0x0F

STR47FBO

1

1

1

1

1

1

1

1

FF

Table 4. Atmel LED Driver-MSL3082 Register Power-up Defaults

REGISTER AND

ADDRESS

FUNCTION

REGISTER DATA

D7

D6

D5

D4

D3

D2

D1

D0

FBODAC*

0x59

Efficiency

Optimizer

DAC

readback

FBOACT

-

-

-

FBODAC[3:0]

DO NOT ACCESS ADDRESS RANGE 0X58 TO 0X8F

E2ADDR

0x90

User

EEPROM

read/write

access

-

E2ADDR[6:0]

E2CTRLSTA

0x91

E2BUSY

BLDACT

E2ERR

-

-

RWCTRL[1:0]

Atmel LED Driver-MSL3082

8-string, High-power, White or RGB LED Driver for TV,

Blacklighting, or Intelligent Solid-state Lighting