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ISL97671
REGISTER 0x07
DC BRIGHTNESS CONTROL REGISTER
BRTDC7
Bit 7 (R/W)
BRTDC6
Bit 6 (R/W)
BRTDC5
Bit 5 (R/W)
BRTDC4
Bit 4 (R/W)
BRTDC3
Bit 3 (R/W)
BRTDC2
Bit 2 (R/W)
BRTDC1
Bit 1 (R/W)
BRTDC0
Bit 0 (R/W)
BIT ASSIGNMENT
BRTDC[7..0]
BIT FIELD DEFINITIONS
= 256 steps of DC brightness levels
FIGURE 34. DESCRIPTIONS OF DC BRIGHTNESS CONTROL REGISTER
DC Brightness Control Register (0x07)
The DC Brightness Control Register 0x07 allows users to have
additional dimming flexibility by:
1. Effectively achieving 16-bits of dimming control when DC
dimming is combined with PWM dimming
2. Achieving visual or audio noise free 8-bit DC dimming over
potentially noisy PWM dimming.
The bit assignment is shown in Figure 34. All of the bits in this
Register can be read or write. Steps 0 to 255 represent the linear
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 batch variations, but external
EEPROM settings storing and restoring are required.
? An SMBus/I 2 C Write Byte cycle to Register 0x07 sets the
brightness level in DC only.
? An SMBus/I 2 C Read Byte cycle to Register 0x07 returns the
current DC brightness level.
? Default value for Register 0x07 is 0xFF.
Configuration Register (0x08)
The Configuration Register provides many extra functions that
users can explore in order to optimize the driver performance at
a given application.
A DirectPWM bit allows Direct PWM where the output current
follows the same input PWM signal.The FSW bit allows users to
set the boost conversion switching frequency between 1.2MHz
and 600kHz. The VSC bits allow users to set 3 levels of channel
short-circuit thresholds or disable it.
The bit assignment is shown in Figure 35. The default value for
Register 0x08 is 0x1F.
REGISTER 0x08
CONFIGURATION REGISTER
RESERVED
Bit 7 (R/W)
RESERVED
Bit 6 (R/W)
BIT5
0 (W)
BIT4
1(W)
BIT3
1(W)
FSW
Bit 2 (R/W)
VSC1
Bit 1 (R/W)
VSC0
Bit 0 (R/W)
BIT ASSIGNMENT
DirectPWM
BITS[5-3]
FSW
VSC[1..0]
BIT FIELD DEFINITIONS
Forces the PWMI signal to directly control the current sources. Note that
there is some synchronous delay between PWMI and current sources.
These bits should always be written as 011
2 levels of Switching Frequencies (1 = 600kHz, 0 = 1.2MHz)
3 levels of Short-Circuit Thresholds (0 = disabled, 1 = 3.6V, 2 = 4.8V, 3 =
5.8V)
FIGURE 35. DESCRIPTIONS OF CONFIGURATION REGISTER
22
FN7631.3
August 14, 2012
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