Rainbow-electronics MAX8759 User Manual download pdf (Page 22)

MAX8759

Low-Cost, SMBus, CCFL Backlight Controller

22 ______________________________________________________________________________________

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

0x00

0xFF

BR7 BRT6 BRT5 BR4 BRT3 BRT2 BRT1 BRT0

Read and

Write

0x01

0x00 Reserved Reserved ALSDEL1 ALSDEL0 ALS_CTL PWM_MD PWM_SEL

LAMP_CTL

Read Only

0x02

N/A Reserved Reserved Reserved Reserved LAMP_STAT OV_CURR Reserved

FAULT

Read Only

0x03

0x00 MFG4 MFG3

MFG2

MFG1

MFG0 REV2 REV1 REV0

Read Only

0x04

0x00

ALS7 ALS6 ALS5

ALS4

ALS3 ALS2 ALS1 ALS0

Read and

Write

0x05

0x00 ALSLL7 ALSLL6 ALSLL5 ALSLL4

ALSLL3

ALSLL2 ALSLL1

ALSLL0

Read and

Write

0x06

0xFF ALSHL7 ALSHL6 ALSHL5 ALSHL4 ALSHL3 ALSHL2 ALSHL1

ALSHL0

SMBCLK

A = START CONDITION.

B = MSB OF ADDRESS CLOCKED INTO SLAVE.

C = LSB OF ADDRESS CLOCKED INTO SLAVE.

D = R/W BIT CLOCKED INTO SLAVE.

AB CD

FG H

SMBDATA

SU:STA

HD:STA

LOW

HIGH

SU:DAT

HD:DAT

SU:DAT

SU:STO

BUF

E = SLAVE PULLS SMBDATA LINE LOW.

F = ACKNOWLEDGE BIT CLOCKED INTO MASTER.

G = MSB OF DATA CLOCKED INTO MASTER.

H = LSB OF DATA CLOCKED INTO MASTER.

I = ACKNOWLEDGE CLOCK PULSE.

J = STOP CONDITION.

K = NEW START CONDITION.

Figure 10. SMBus Read Timing

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 30 31

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