BU2098F_09 Datasheet, PDF (8/13 Pages) Rohm – Serial / Parallel 2-input Drivers

BU2098F, BU2090F, BU2090FS
○Data transmission timing
Technical Note
SDA _{S A6 A5 A4 A3 A2 A1 A0 R/W ACK D7 D6 D5 D4 D3 D2 D1 D0 ACK P}
Slave address
Write data
Latch pulse
Output (Q7～Q0)
Output the write data to Q7～Q0 at the same time.
Fig.5 Timing chart for WRITE
Command sample for driving LEDs. These are all off. (terminal A0～A2 is open)
Power Supply ON
LEDs all-ON with power supply ON
SDA
S
0
1
1
1
1
1
1
0 ACK 1
1
1
1
1
1
1
1 ACK P
Slave address
Write data
LEDs are all-off by this command.
・RESET CONDITION
After reset, Q0～Q7 pins are ON. (LEDs are all ON.)
・RISING TIME OF POWER SUPPLY
VDD must rise within 10ms. If the rise time would exceed 10ms, it is afraid not to reset the BU2098F.
VDD
GND
t≦10ms
Fig.6 Rising time of power supply
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8/12
2009.06 - Rev.A