Wide Brightness Range

CCFL Backlight Controllers

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23

Brightness Register

[BRIGHT4–BRIGHT0] (POR = 0b10111)

The 5-bit brightness register corresponds with the 5-bit

brightness code used in the dimming control (see

Dimming Range). BRIGHT4–BRIGHT0 = 0b00000 sets

minimum brightness, and BRIGHT4–BRIGHT0 =

0b11111 sets maximum brightness. The SMBus inter-

face does not control whether the device regulates the

current by analog dimming, DPWM dimming, or both;

this is done by MINDAC (Table 2).

Shutdown-Mode Register

[SHMD2–SHMD0] (POR = 0b001)

The 3-bit shutdown-mode register configures the oper-

ation of the device when the SH/SUS pin is toggled as

described in Table 7. The shutdown-mode register can

also be used to shut off directly the CCFL, regardless

of the SH/SUS state (Table 8).

DATA REGISTER BIT ASSIGNMENT

R OR

W

PROTOCOL

COMMAND

BYTE*

POR

STATE

BIT 7

(MSB)

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

(LSB)

Read and

Write

0x01

0b0XXX

XX01

0x17

0

0

0

BRIGHT4

(MSB)

BRIGHT3

BRIGHT2

BRIGHT1

BRIGHT0

(LSB)

Read and

Write

0x02

0b0XXX

XX10

0xF9

STATUS1

STATUS0

1

1

1

SHMD2

SHMD1

SHMD0

Read

Only

0x03

0b0XXX

XX11

0x96

ChipID7

1

ChipID6

0

ChipID5

0

ChipID4

1

ChipID3

0

ChipID2

1

ChipID1

1

ChipID0

0

Read

Only

0x04

0b0XXX

XX00

0x00

ChipRev7

0

ChipRev6

0

ChipRev5

0

ChipRev4

0

ChipRev3

0

ChipRev2

0

ChipRev1

0

ChipRev0

0

Read and

Write

0x40

0b10XX

XXXX

0xBF

BRIGHT4

(MSB)

BRIGHT3

BRIGHT2

BRIGHT1

BRIGHT0

(LSB)

1

STATUS1

STATUS0

Read

Only

0xFE

0b11XX

XXX0

0x4D

MfgID7

0

MfgID6

1

MfgID5

0

MfgID4

0

MfgID3

1

MfgID2

1

MfgID1

0

MfgID0

1

Read

Only

0xFF

0b11XX

XXX1

0x96

ChipID7

1

ChipID6

0

ChipID5

0

ChipID4

1

ChipID3

0

ChipID2

1

ChipID1

1

ChipID0

0

*The hexadecimal command byte shown is recommended for maximum forward compatibility with future MAXIM products.

Table 6. Commands Description