BD2802GU データシートの表示（PDF） - ROHM Semiconductor

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BD2802GU

System LED Drivers for Mobile phones 6LEDs Illumination

ROHM Semiconductor 

BD2802GU

Technical Note

●When two BD2802GU drivers are used and the clock is shared by CLKIO:

Because a sequence is already programmed within an IC chip for RGB falling, “Enable” shall be set to “OFF” and

clock supply shall be continued for at least three clocks so that operations can be performed using external clocks.

マスMタaーste側r eEnanbalbelde

スレSーlaブve側enEabnlaebdle

(min=0ms)

Master: Chip using CLKIO as output

Slave: Chip using CLKIO as input

mmini=nス= レslaーveブin側pu入t c力locクk ロ(3ッcloクckのs) 3 クロック分

(マ(Fスorタmーas側terのclクocロksッinクusをe:使m用in し= 1て5 いsる) 場合は min=15μs)

*Even in independent slave mode, its setting “Enable” shall be reset to “OFF” and then clock supply must be

continued for 3 clocks or more.

Clock I/O switching shall be avoided during RGB operation.

Enable: CLKEN, RGB1EN, RGB2EN, RGB1OS, RGB2OS

- Setting example

Master side (clock output side)

RGB waveform setting



Slave side (clock input side)

RGB waveform setting



Master side Clock output setting

CLKEN=1, CLKMD=1

… Performs clock output.



Slave side Clock input setting

CLKEN=1, CLKMD=0

… Allows clock reception.



Master side RGB lighting





This duration shall be short as much as possible.



Slave side RGB lighting

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20/27

2011.04 - Rev.A

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