BD9267KUT ROHM [Rohm], BD9267KUT Datasheet - Page 10

• Manufacturer Part Number: BD9267KUT
• Description: White LED Diver for Backlight of Medium/Large-sized LCDs
• Manufacturer: ROHM [Rohm]

BD9267KUT
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
COMP2(54PIN)
CS(57PIN), CLK(58PIN,) DI(59PIN), DO(60PIN)
VSYNC(61PIN), HSYNC(62PIN)
ERR_DET(63PIN)
DGND(56PIN)
DVDD(64PIN)
this pin is pulled up to the DVDD voltage of the IC or else, it will be set to output High voltage for normal operation. If any
error is detected, the internal NMOS of the IC will be put into ON state, setting the pin to output Low voltage.
registers located at addresses 05h to 0Ch makes it possible to recognize what channel is in what type of error state. (For
detail, refer to the description of registers to be hereinafter provided.)
reaches 3.3V (typ.), the IC will start operating. Insert a ceramic capacitor of approx. 1uF in capacitance between the DVDD
and DGND pins in the vicinity of the IC.
ON time, and PWM delay time. For data input format and timing, refer to the description of Logic block to be hereinafter
provided.
The DGND pin is a digital circuit ground pin of the IC. Lay out the DGND pin using interconnect independent of that for
the GND pin wherever possible.
The COMP2 pin is used to feed back the state of voltage to the external power supply in order to optimize the power
supply voltage for the LED layer.
Positive feedback voltage is output to a pin having the lowest voltage out of the D9 to D16 pins. If the lowest voltage of
the D9 to D16 pins is higher than 0.6V typical voltage, the COMP2 pin will become open-circuited. If the lowest voltage of
these pins is lower than 0.6V typical voltage, the internal NPN transistor of the COMP2 pin will turn ON. The COMP2 pin
is intended to connect to the output voltage monitor pin of the DC/DC converter.
DVDD power supply of the digital block. For data input format and timing, refer to the description of Logic block to be
hereinafter provided.
The VSYNC and HSYNC input signals enable the PWM light modulation signal to make setting of PWM frequency, PWM
The ERR_DET pin is used to output an IC error detection signal and provides the N-MOS open-drain output function. If
When the ERR_DET pin is put into the GND Level, the LED has already caused an error. In this case, reading the
The DVDD pin is used to input power in the digital block of the IC in the range of 3.0 to 3.6V. When the DVDD pin voltage
These pins are used to control the IC with the CS, CLK, DI, and DO serial interfaces. Input levels are determined by the
High-level input
Low-level input
Normal operation
LED error detection
Input State
State
DVDD×0.7~ DVDD+0.3[V]
-0.3~DVDD×0.3 [V]
OPEN
GND Level
FAIL Signal Output
Input Level
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TSZ02201-0F1F0C100050-1-2
03.Aug.2012 Rev.001
Datasheet