ISL97673IRZ-TK Intersil, ISL97673IRZ-TK Datasheet - Page 22

• Manufacturer Part Number: ISL97673IRZ-TK
• Description: IC LED DVR PWM CTRL 6CH 20QFN
• Manufacturer: Intersil

Specifications of ISL97673IRZ-TK

• 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
• Voltage - Output: *
• 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

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 33. 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
LED
BIT ASSIGNMENT
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 33. DESCRIPTIONS OF DC BRIGHTNESS CONTROL REGISTER
DC BRIGHTNESS CONTROL
BRTDC5
Bit 5 (R)
22
MFG2
= Manufacturer ID. See “Si Revision 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)
= 256 steps of DC brightness levels
ID REGISTER
REGISTER
BIT FIELD DEFINITIONS
BIT FIELD DEFINITIONS
BRTDC4
Bit 4 (R)
FIGURE 32. DESCRIPTIONS OF ID REGISTER
MFG1
BRTDC3
Bit 3 (R)
MFG0
ISL97673
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 Direct PWM bit allows Direct PWM where the output
current follows the same input PWM signal.
A PWM-to-DC bit allows users to provide convert PWM
input into average DC LED current output with the level
that is proportional to the input PWM duty cycle.
A BstSlewRate bit allows users to control the boost FET
slew rate (the rates of turn-on and turn-off). The slew
rate can be selected to four relative strengths when
driving the internal boost FET. The purpose of this
function is to allow users to experiment the slew rate
with respect to EMI effect in the system. In general, the
slower the slew rate is, the lower the EMI interference to
the surrounding circuits; however, the switching loss of
the boost FET is also increased.
The FSW bit allows users to set the boost conversion
switching frequency between 1.2MHz and 600kHz.
REV2
BRTDC1
Bit 1 (R)
REV1
BRTDC0
Bit 0 (R)
REV0
June 24, 2010
FN7633.0