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ISL97671A
Identification Register (0x03)
The ID register contains 3 bit fields to denote the LED driver (always
set to 1), manufacturer and the silicon revision of the controller IC.
The bit field widths allow up to 16 vendors with up to 8 silicon
revisions each. All of the bits in this register are read-only.
? Vendor ID 9 represents Intersil Corporation.
? The default value for Register 0x03 is 0xC8.
The initial value of REV shall be 0. Subsequent values of REV will
increment by 1.
DC Brightness Control Register (0x07)
The DC Brightness Control Register 0x07 sets the LED current
level between 0% and 100% of the level set using the RSET pin.
When PWM dimming, the level set is the current during the on
time. This register 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 33. All of the bits in this
Register can be read or written. Steps 0 to 255 represent the
linear steps of current adjustment in DC on-the-fly.
? An SMBus/I 2 C Write Byte cycle to Register 0x07 sets the DC
LED current level.
? An SMBus/I 2 C Read Byte cycle to Register 0x07 returns the DC
LED current.
? Default value for Register 0x07 is 0xFF.
REGISTER 0x03
ID REGISTER
LED PANEL
Bit 7 = 1
MFG3
Bit 6 (R)
MFG2
Bit 5 (R)
MFG1
Bit 4 (R)
MFG0
Bit 3 (R)
REV2
Bit 2 (R)
REV1
Bit 1 (R)
REV0
Bit 0 (R)
BIT ASSIGNMENT
MFG[3..0]
REV[2..0]
REGISTER 0x07
BIT FIELD DEFINITIONS
= Manufacturer ID. See “Identification Register
(0x03)” on page 21.
data 0 to 8 in decimal correspond to other vendors
data 9 in decimal represents Intersil ID
data 10 to 14 in decimal are reserved
data 15 in decimal Manufacturer ID is not
implemented
= Silicon rev (Rev 0 through Rev 7 allowed for silicon
spins)
FIGURE 32. DESCRIPTIONS OF ID REGISTER
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 33. DESCRIPTIONS OF DC BRIGHTNESS CONTROL REGISTER
22
FN7709.3
November 30, 2012
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