BD9267KUT データシートの表示（PDF） - ROHM Semiconductor

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BD9267KUT

White LED Diver for Backlight of Medium/Large-sized LCDs

ROHM Semiconductor 

BD9267KUT

Datasheet

COMP2(54PIN)

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.

CS(57PIN), CLK(58PIN,) DI(59PIN), DO(60PIN)

These pins are used to control the IC with the CS, CLK, DI, and DO serial interfaces. Input levels are determined by the

DVDD power supply of the digital block. For data input format and timing, refer to the description of Logic block to be

hereinafter provided.

Input State

High-level input

Low-level input

Input Level

DVDD×0.7~ DVDD+0.3[V]

-0.3~DVDD×0.3 [V]

VSYNC(61PIN), HSYNC(62PIN)

The VSYNC and HSYNC input signals enable the PWM light modulation signal to make setting of PWM frequency, PWM

ON time, and PWM delay time. For data input format and timing, refer to the description of Logic block to be hereinafter

provided.

ERR_DET(63PIN)

The ERR_DET pin is used to output an IC error detection signal and provides the N-MOS open-drain output function. If

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.

State

FAIL Signal Output

Normal operation OPEN

LED error detection GND Level

When the ERR_DET pin is put into the GND Level, the LED has already caused an error. In this case, reading the

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.)

DGND(56PIN)

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.

DVDD(64PIN)

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

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.

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TSZ22111・15・001

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TSZ02201-0F1F0C100050-1-2

03.Aug.2012 Rev.001

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