PT6332 Datasheet, PDF (27/37 Pages) Princeton Technology Corp – VFD Driver/Controller IC

VFD Driver/Controller IC
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PT6332
• Operation
When the controller use timer processing for key on/off determination and key data readout, it must set
CE low and check the state of DO at least once every t9 period. If DO is low, the controller must
recognize that a key has been pressed and read out the key data.
The period t9 must obey the following inequality:
t9 > t7 + t8 + t6
Note: If the controller reads out key data when DO is high, both the key data (KD1 to KD25) and the
sleep acknowledge data will be invalid data.
PT6332 V1.0
- 27 -
February, 2006