ISL97673IRZ Intersil, ISL97673IRZ Datasheet - Page 20

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

Specifications of ISL97673IRZ

• 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

PWM Brightness Control Register (0x00)
The Brightness control resolution has 256 steps of PWM
duty cycle adjustment. The bit assignment is shown in
Figure 29. All of the bits in this Brightness Control
Register can be read or write. Step 0 corresponds to the
minimum step where the current is less than 10µA.
Steps 1 to 255 represent the linear steps between 0.39%
and 100% duty cycle with approximately 0.39% duty
cycle adjustment per step.
• An SMBus/I
Device Control Register (0x01)
PWM_MD PWM_SEL
RESERVED RESERVED RESERVED RESERVED RESERVED
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 7 (R/W)
REGISTER 0x01
the PWM brightness level only if the backlight
controller is in SMBus/I
REGISTER 0x00
BRT7
BIT ASSIGNMENT
X
0
0
1
1
BRT[7..0]
Bit 6 (R/W)
2
C Write Byte cycle to Register 0x00 sets
BRT6
X
0
1
0
1
DEVICE CONTROL REGISTER
BL_CTL
PWM BRIGHTNESS CONTROL
FIGURE 29. DESCRIPTIONS OF BRIGHTNESS CONTROL REGISTER
20
2
Bit 5 (R/W) Bit 4 (R/W)
BRT5
= 256 steps of PWM brightness levels
C mode (see Table 3A
0
1
1
1
1
FIGURE 30. DESCRIPTIONS OF DEVICE CONTROL REGISTER
Backlight Off
SMBus/I
(DPST)
PWMI controlled PWM dimming
SMBus/I
Backlight On but stays with previous
mode selection
REGISTER
BIT FIELD DEFINITIONS
BRT4
2
2
C and PWM dimming
C controlled PWM dimming
MODE
BRT3
Bit 3 (R/W)
ISL97673
• An SMBus/I
• An SMBus/I
• An SMBus/I
• Default value for Register 0x00 is 0xFF.
BRT2
Operating Modes selected by Device Control Register
Bits 1 and 2).
returns the programmed PWM brightness level.
the backlight controller to the maximum brightness.
the backlight controller to the minimum brightness
output.
Bit 2 (R/W) Bit 1 (R/W) Bit 0 (R/W)
PWM_MD PWM_SEL
BRT1
2
2
2
C setting of 0xFF for Register 0x00 sets
C setting of 0x00 for Register 0x00 sets
C Read Byte cycle to Register 0x00
BRT0
BL_CTL
June 24, 2010
FN7633.0