BD9267KUT ROHM [Rohm], BD9267KUT Datasheet - Page 20

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

BD9267KUT
◆ ◆ ◆ ◆ Timing chart
●PWM Delay and ON Duty setting procedure
●oft-start masking function
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© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
By making register setting, PWM output delay and ON duty time counts of CH1 to CH16 can be controlled.
The above timing chart shows an example for CH1.
(To make delay time count setting, write 06h in address 2Ch. To make ON duty time count setting, write 07h in address 0Ch.)
The delay counter starts counting after counting three from the leading edge of VSYNC signal. When the counter reaches the
set delay count value (06h), the duty counter will start counting simultaneously when the PWM_OUT_01 signal is set to “H”.
Subsequently, when the duty counter reaches the set duty count value (07h), the PWM_OUT_01 signal will be set to ”L”.
Since then, the said sequence is continuously repeated.
The same control is also carried out for CH2 to CH16.
The delay counter counts up to FFCh. Even if the set value exceeds this maximum value, it will also count up to FFCh.
relevant section.
(Example) When ADDR 09h and DATA 02h:
PWM_OUT_01
A value set at address 09h serves as the pulse number of the VSYNC signal and masks the error signal control in the
LED_OP_DET_*
counter
counter
Delay
PWM_OUT_*
VSYNC
Duty
HSYNC
VSYNC
ERROR
SSEND
0
0
1
Figure 17. Setting for PWM Delay and ON Duty
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Figure 18. In case of ADDR:09h and DATA:02h
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＊： 01～16
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1
8
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3
4
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7
8
TSZ02201-0F1F0C100050-1-2
4093 4094 4095
03.Aug.2012 Rev.001
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Datasheet
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