BD9202EFS 데이터 시트보기 (PDF) - ROHM Semiconductor

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BD9202EFS

White backlight LED drivers

ROHM Semiconductor 

BD9202EFS

PWMCLK(=FBCT)

(600kHz)

PWMEN

(resister)

COUNT [9:0]

0

(internal)

PWMLED1 [9:0] = 300d = 12Ch

1 234 56

LED1ON

(internal)

PWMLED2 [9:0] = 6d = 006h

LED2ON

(internal)

PPWMWSMet設ting定ex例ample

300

Technical Note

1021 1022 1023 0

1.71ms（586Hz）

※ When count [ 9:0 ] becomes 1, LEDON will become High and then LED lights up. When COUNT [ 9:0 ] reaches to the

value that is set by PWM pulse, LEDON will become Low and the light goes out.

※ COUNT [9:0 ] =1 with Illumination timing of each channel becomes being identical.

※ When setting of pwm modulated light is modified, it is reflected being at the point where COUNT [ 9:0 ] is reset to 0

(It is not immediately reflection with register entry)

※ After writing ' 1 ' in PWMEN, the delay of 0 ～maximum of 1 clocks occurs until LED lights up.

○ Register setting example of LED illuminations

・ When illuminates LED3 and LED8 regular (100% illumination)

① (ADDR,DATA)＝(01h､84h)

→ Operation of regular illumination

・ When it does PWM modulated light with 40% to LED3, and 80% to LED8,

1024×40%=409 , 1024×80%=819

Because (409)DEC=(199)HEX , (819)DEC=(333)HEX

① (ADDR,DATA)＝(06h､99h)

(ADDR,DATA)＝(07h､01h)

→Setting LED3 to 40%

② (ADDR,DATA)＝(10h､33h)

(ADDR,DATA)＝(11h､03h)

→Setting LED8 to 80%

③ (ADDR,DATA)＝(00h､01h)

→Operation of modulated light

○ The method connected control wire when plural IC is used

Connected method of the control wire when plural BD9202EFS is controlled with one CPU is shown.

You connect CPUCLK and CPUDI in parallel (note the ability of respective drive), CPUCS wires in each BD9202EFS.

CPU

BD9202 No.1

CPUCS

DATA

CPUDI

CLK

CPUCLK

CS1

BD9202 No.2

CS2

CPUCS

CS3

CPUDI

CPUCLK

BD9202 No.3

CPUCS

CPUDI

CPUCLK

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10/19

2009.04 - Rev.A

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