ISL97635AIRZ-T Intersil, ISL97635AIRZ-T Datasheet - Page 21

IC LED DRVR WHT/RGB BCKLGT 24QFN

ISL97635AIRZ-T

Manufacturer Part Number
ISL97635AIRZ-T
Description
IC LED DRVR WHT/RGB BCKLGT 24QFN
Manufacturer
Intersil
Type
Backlight, White LED, RGBr
Datasheet

Specifications of ISL97635AIRZ-T

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
6 V ~ 24 V
Voltage - Output
34.5V
Mounting Type
Surface Mount
Package / Case
24-VQFN
Operating Temperature
-40°C ~ 85°C
Current - Output / Channel
35mA
Internal Switch(s)
Yes
Efficiency
91%
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ISL97635AIRZ-TK
Manufacturer:
INTERSIL
Quantity:
1 240
• A value of 0 written to BL_CTL immediately turns off the BL.
• ** Note that the behavior of register 0x00 (Brightness
• When an SMBus mode is selected, register 0x00 reflects
• When SMBus mode with DPST is selected, register 0x00
• When a write to register 0x01 (Device Control Register)
• The default value for register 0x01 is 0x00.
Fault/Status Register (0x02)
This register has six status bits that allow monitoring of the
backlight controller’s operating state. Bit 0 is a logical “OR” of all
fault codes to simplify error detection. Not all of the bits in this
register are fault related (Bit 3 is a simple BL status indicator).
The remaining bits are reserved and return a “0” when read and
ignore the bit value when written. All of the bits in this register
are read-only, with the exception of bit 0, which can be cleared
by writing to it.
• A Read Byte cycle to register 0x02 indicates the current
• A Read Byte cycles to register 0x2 also returns FAULT as
• 1_CH_SD returns a 1 if one or more channels have
• 2_CH_SD returns a 1 if two or more channels have faulted
when Bit 3 BL_STAT of register 0x02 is 1 and register 0x09
is not 0. See Figures 23 and 24.
The BL is deemed to be off when Bit 3 BL_STAT of register
0x02 is 0 and register 0x09 is 0. See Figures 23 and 24.
Control Register) is affected by certain combinations of the
control bits, as shown in Table 3 “Operating Modes
Selected by Device Control Register Bits 1 and 2.”
the last value written to it. But, when any non-SMBus
mode is selected, register 0x00 reflects the current
brightness value based on the current mode of operation,
with the exception of SMBus mode with DPST, where
PWM_MD = 0 and PWM_SEL = 0.
reflects the last value written to it from SMBus.
causes the backlight controller to transition to an SMBus
mode, the brightness of the BL does not change. On the
other hand, when a write to register 0x01causes the
backlight controller to transition to a non-SMBus mode,
the brightness of the BL changes as appropriate for the
new mode.
BL on/off status in BL_STAT (1 if the BL is on, 0 if the BL is
off).
the logical OR of THRM_SHDN, OV_CURR, 2_CH_SD,
and 1_CH_SD should these events occur.
faulted out.
out.
21
ISL97635A
• A fault will not be reported in the event the BL is
• When FAULT is set to 1, it will remain at 1 even if the
• The controller will not indicate a fault if the VBL+ goes
Default value for register 0x02 is 0x00.
Identification Register (0x03)
The ID register contains three 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 eight silicon revisions each. In order to keep the
number of silicon revisions low, the revision field will not be
updated unless the part will make it out to the user’s factory.
Thus, if during the engineering development process three
Silicon spins were needed, the next available revision ID
would be used for all three spins until that same ID made it to
the factory. Except Bit 7 which has to be 1, all of the bits in this
register are read-only.
• Vendor ID 9 represents Intersil Corp.
• Default value for register 0x03 is 0xC8.
The initial value of REV shall be 0. Subsequent values of
REV will increment by 1.
commanded on and immediately off by the system.
signal which sets it goes away. FAULT will be cleared
when the BL_CTL bit of the Device Control Register is
toggled or when written low. At that time, if the fault
condition is still present or reoccurs, FAULT will be set to 1
again. BL_STAT will not cause FAULT to be set
away, whether or not the LEDs were on at the time of the
power loss. This can occur if there is some hang condition
that causes the user to force the system off by holding the
power button down for 4s.
December 22, 2008
.
FN6564.2

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