ISL97674IRZ Intersil, ISL97674IRZ Datasheet - Page 19

• Manufacturer Part Number: ISL97674IRZ
• Description: IC LED DVR PWM CTRL 6CH 20QFN
• Manufacturer: Intersil

Specifications of ISL97674IRZ

• 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 30. All of the bits in this Brightness Control
Register can be read or write. Step 0 corresponds to the
minimum step. 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
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)
RESERVED RESERVED RESERVED RESERVED RESERVED
Bit 7 (R/W)
the PWM brightness level only if the backlight
controller is in SMBus/I
REGISTER 0x00
REGISTER 0x01
BRT7
BIT ASSIGNMENT
BIT ASSIGNMENT
SMBus/I2C_PWM
EXT_PWM
BRT[7..0]
BL_CTL
Bit 6 (R/W)
2
C Write Byte cycle to Register 0x00 sets
BRT6
DEVICE CONTROL REGISTER
PWM BRIGHTNESS CONTROL
FIGURE 30. DESCRIPTIONS OF BRIGHTNESS CONTROL REGISTER
19
Bit 5 (R/W)
2
BRT5
= 256 steps of PWM brightness levels
= PWM mode select bit (1 = absolute
brightness, 0 = % change) default = 0
= Brightness control select bit (1 = control
by PWM, 0 = control by SMBus/I
= 0
= BL On/Off (1 = On, 0 = Off) default = 0
C mode (see Table 3
FIGURE 31. DESCRIPTIONS OF DEVICE CONTROL REGISTER
REGISTER
BIT FIELD DEFINITIONS
BIT FIELD DEFINITIONS
Bit 4 (R/W)
BRT4
BRT3
Bit 3 (R/W)
ISL97674
2
C) default
• An SMBus/I
• An SMBus/I
• An SMBus/I
• Default value for Register 0x00 is 0xFF.
BRT2
Bit 2 (R/W)
SMBus/I
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.
C_PWM
2
BRT1
EXT_PWM
Bit 1 (R/W)
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
Bit 0 (R/W)
BL_CTL
June 25, 2010
FN7634.0