ISL97671IRZ Intersil, ISL97671IRZ Datasheet - Page 23

• Manufacturer Part Number: ISL97671IRZ
• Description: IC LED DVR PWM CTRL 6CH 20QFN
• Manufacturer: Intersil

Specifications of ISL97671IRZ

• Topology: PWM, Step-Up (Boost)
• Number Of Outputs: 6
• Internal Driver: Yes
• Type - Primary: Automotive, Backlight
• Type - Secondary: RGB, White LED
• Frequency: 600kHz ~ 1.2MHz
• Voltage - Supply: 4.5 V ~ 26.5 V
• Mounting Type: Surface Mount
• Package / Case: 20-VFQFN Exposed Pad
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 40mA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -

DC Brightness Control Register (0x07)
The DC Brightness Control Register 0x07 allows users to
have additional dimming flexibility by:
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
• An SMBus/I
• Default value for Register 0x07 is 0xFF.
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)
1. Effectively achieving 16-bits of dimming control
2. Achieving visual or audio noise free 8-bit DC
Bit 7 = 1
BRTDC7
REGISTER 0x03
REGISTER 0x07
the brightness level in DC only.
returns the current DC brightness level.
PANEL
when DC dimming is combined with PWM dimming
dimming over potentially noisy PWM dimming.
BIT ASSIGNMENT
BIT ASSIGNMENT
LED
BRTDC[7..0]
REV[2..0]
MFG[3..0]
BRTDC6
Bit 6 (R)
2
2
MFG3
C Write Byte cycle to Register 0x07 sets
C Read Byte cycle to Register 0x07
FIGURE 34. DESCRIPTIONS OF DC BRIGHTNESS CONTROL REGISTER
DC BRIGHTNESS CONTROL
BRTDC5
Bit 5 (R)
23
MFG2
= Manufacturer ID. See “Identification
Register (0x03)” on page 22.
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)
= 256 steps of DC brightness levels
ID REGISTER
REGISTER
BIT FIELD DEFINITIONS
BIT FIELD DEFINITIONS
FIGURE 33. DESCRIPTIONS OF ID REGISTER
BRTDC4
Bit 4 (R)
MFG1
BRTDC3
Bit 3 (R)
MFG0
ISL97671
BRTDC2
Bit 2 (R)
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.
REV2
BRTDC1
Bit 1 (R)
REV1
BRTDC0
Bit 0 (R)
REV0
June 24, 2010
FN7631.0