ISL97635A datasheet(23/29 Pages) RENESAS

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ISL97635A

FN6564 Rev.3.00

Page 23 of 29

Sep 26, 2017

DC Brightness Control Register (0x07)

The DC Brightness Control Register 0x07 allows users to have

additional dimming flexibility as:

1. Achieving effectively 16-bit of dimming control when

combined DC dimming with PWM dimming or

2. Achieving visual or audio noise free 8-bit DC dimming over

potentially noisy PWM dimming.

The bit assignment is shown in Figure 28. All of the bits in this

steps of current adjustment in DC on the fly. It can also be

considered as the peak current factory calibration feature to

account for various LED production batches variations but

external EEPROM settings storing and restoring are required.

• An SMBus Write Byte cycle to register 0x07 sets the brightness

level in DC only.

• An SMBus Read Byte cycle to register 0x07 returns the current

DC brightness level.

• Default value for register 0x07 is 0xFF.

FIGURE 28. DESCRIPTIONS OF DC BRIGHTNESS CONTROL REGISTER

DC BRIGHTNESS CONTROL REGISTER

BRTDC7

BRTDC6

BRTDC5

BRTDC4

BRTDC3

BRTDC2

BRTDC1

BRTDC0

Bit 7 (R/W)

Bit 6 (R/W)

Bit 5 (R/W)

Bit 4 (R/W)

Bit 3 (R/W)

Bit 2 (R/W)

Bit 1 (R/W)

Bit 0 (R/W)

BIT ASSIGNMENT

BIT FIELD DEFINITIONS

BRTDC[7..0]

= 256 steps of DC brightness levels

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