ISL97635A

FN6564 Rev.3.00

Page 18 of 29

Sep 26, 2017

SMBus Register Definitions

The backlight controller registers are Byte wide and accessible

via the SMBus Read/Write Byte protocols. Their bit assignments

are provided in the following sections with reserved bits

containing a default value of “0”.

TABLE 2A. REGISTER LISTING

ADDRESS

REGISTER

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

DEFAULT

VALUE

SMBUS

PROTOCOL

0x00

PWM

Brightness

Control

Register

BRT7

BRT6

BRT5

BRT4

BRT3

BRT2

BRT1

BRT0

0xFF

Read and Write

0x01

Device Control

Register

Reserved Reserved Reserve

d

Reserved Reserved PWM_MD PWM_SEL

BL_CTL

0x00

Read and Write

0x02

Fault/Status

Register

Reserved Reserved 2_CH_S

D

1_CH_SD BL_STAT OV_CURR THRM_SHDN FAULT

0x00

Read Only

0x03

Identification

Register

LED

PANEL

MFG3

MFG2

MFG1

MFG0

REV2

REV1

REV0

0xC8

Read Only

0x07

DC Brightness

Control

Register

BRTDC7

BRTDC6

BRTDC5

BRTDC4

BRTDC3

BRTDC2

BRTDC1

BRTDC

0

0xFF

Read and Write

0x08

Configuration

Register

Reserved Reserved Reserve

d

Reserved Reserved FSW

VSC1

VSC0

0xXF

Read and Write

0x09

Output

Channel

Register

Reserved Reserved CH5

CH4

CH3

CH2

CH1

CH0

0xFF

Read and Write

TABLE 2B. DATA BIT DESCRIPTIONS

ADDRESS

REGISTER

DATA BIT DESCRIPTIONS

0x00

PWM Brightness Control Register

BRT[7..0] = 256 steps of DPWM duty cycle brightness control

0x01

Device Control Register

PWM_MD = PWM mode select bit (1 = absolute brightness, 0 = % change), default = 0

PWM_SEL = Brightness control select bit (1 = control by PWMI, 0 = control by SMBus), default = 0

BL_CTL = BL On/Off (1 = On, 0 = Off), default = 0

0x02

Fault/Status Register

2_CH_SD = Two LED output channels are shutdown (1 = shutdown, 0 = OK)

1_CH_SD = One LED output channel is shutdown (1 = shutdown, 0 = OK)

BL_STAT = BL status (1 = BL On, 0 = BL Off)

OV_CURR = Input overcurrent (1 = Overcurrent condition, 0 = Current OK)

THRM_SHDN = Thermal Shutdown (1 = Thermal fault, 0 = Thermal OK)

FAULT = Fault occurred (Logic “OR” of all of the fault conditions)

0x03

Identification Register

MFG[3..0] = Manufacturer ID (16 vendors available. Intersil is vendor ID 9)

REV[2..0] = Silicon rev (Rev 0 through Rev 7 allowed for silicon spins)

0x07

DC Brightness Control Register

BRTDC[7..0] = 256 steps of DC brightness control

PWM_MD PWM_SEL

MODE

X1

PWMI Mode

10

SMBus Mode

0

0

SMBus and PWMI mode with DPST