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MAX1739/MAX1839

†

Wide Brightness Range

CCFL Backlight Controllers

______________________________________________________________________________________ 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

ChipID6

ChipID5

ChipID4

ChipID3

ChipID2

ChipID1

ChipID0

Read

Only

0x04

0b0XXX

XX00

0x00

ChipRev7

ChipRev6

ChipRev5

ChipRev4

ChipRev3

ChipRev2

ChipRev1

ChipRev0

Read and

Write

0x40

0b10XX

XXXX

0xBF

BRIGHT4

(MSB)

BRIGHT3 BRIGHT2 BRIGHT1

BRIGHT0

(LSB)

1 STATUS1 STATUS0

Read

Only

0xFE

0b11XX

XXX0

0x4D

MfgID7

MfgID6

MfgID5

MfgID4

MfgID3

MfgID2

MfgID1

MfgID0

Read

Only

0xFF

0b11XX

XXX1

0x96

ChipID7

ChipID6

ChipID5

ChipID4

ChipID3

ChipID2

ChipID1

ChipID0

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

Table 6. Commands Description

1 2 ... 18 19 20 21 22 23 24 25 26

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