Rainbow-electronics MAX8709 Manual do Utilizador descarregar pdf (Página 18)

MAX8709

High-Efficiency CCFL Backlight

Controller with SMBus Interface

18 ______________________________________________________________________________________

Brightness Register [BRIGHT4 – BRIGHT0]

(POR = 0b10111)

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

brightness code used in dimming control (See the

Dimming Control section). BRIGHT4 - BRIGHT0 =

0b11111 sets minimum brightness and BRIGHT4 -

BRIGHT0 = 0b00000 sets maximum brightness. Note that

the brightness-register polarity of command bytes 0xA9

and 0xAA are inverted from that of command byte 0x01.

Shutdown-Mode Register [SHMD2–SHMD0]

(POR = 0b001)

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

ation of the device when the SUS pin is toggled as

described in Table 4. The shutdown-mode register can

also be used to directly shut off the CCFL regardless of

the state of SUS (Table 5).

Table 3. Commands Description

DATA REGISTER BIT ASSIGNMENT

SMBus

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

111

SHMD2 SHMD1

SHMD0

Read Only

0x03

0b0XXX XX11

0x0C

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

0xAA

0b10XX XXX0

0x40

BRIGHT4

(MSB)

BRIGHT3 BRIGHT2 BRIGHT1

BRIGHT0

(LSB)

STATUS1

STATUS0

Read and

Write

0XA9

0b10XX XXX1

0x40

BRIGHT4

(MSB)

BRIGHT3 BRIGHT2 BRIGHT1

BRIGHT0

(LSB)

STATUS1

STATUS0

Read Only

0xFE

0b11XX XXX0

0x4D

MfgID7

MfgID6

MfgID5

MfgID4

MfgID3

MfgID2

MfgID1

MfgID0

Read Only

0xFF

0b11XX XXX1

0x0C

ChipID7

ChipID6

ChipID5

ChipID4

ChipID3

ChipID2

ChipID1

ChipID0

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

X = Don’t care.

Table 4. SHMD Register Bit Descriptions

BIT

NAME

POR

STATE

DESCRIPTION

SHMD2

SHMD2 = 1 forces the lamp off and sets STATUS1. SHMD2 = 0 allows the lamp to operate,

although it may still be shut down by SUS (depending on the state of SHMD1 and SHMD0).

SHMD1

When SUS = 0, this bit has no effect. SUS = 1 and SHMD1 = 1 forces the lamp off and sets STATUS1.

SUS = 1 and SHMD1 = 0 allows the lamp to operate, although it may still be shut down by the SHMD2 bit.

SHMD0

When SUS = 1, this bit has no effect. SUS = 0 and SHMD0 = 1 forces the lamp off and sets STATUS1.

SUS = 0 and SHMD0 = 0 allows the lamp to operate, although it may still be shut down by the SHMD2 bit.

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