BU97501KV Datasheet, PDF (13/33 Pages) Rohm – Integrated RAM for display data

BU97501KV
Datasheet
Multiple Key Presses
Although the BU97501KV is capable of key scanning without inserting diodes for dual key presses, triple key presses on
the KI1 to KI5 input pin lines, or multiple key presses on the KS1 to KS6 output pin lines, multiple presses other than
these cases may result in keys that were not pressed recognized as having been pressed. Therefore, a diode must be
inserted in series with each key. Applications that do not recognize multiple key presses of three or more keys should
check the key data for three or more 1 bit and ignore such data.
OSCILLATOR
Several kinds of clock for logic and analog circuits are generated from internal oscillation circuit or external clock.
The OSC pins are open if the internal oscillator is used.
(Note9) To use external clock mode, please set in DRV CTRL1 command.
OSC
BU97501KV
VSS
OPEN
Figure 13. Internal clock mode
OSC
BU97501KV
Clock Input
Figure 14. External clock mode
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11.Apr.2014 Rev.004