PT6332 Datasheet, PDF (15/37 Pages) Princeton Technology Corp – VFD Driver/Controller IC

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VFD Driver/Controller IC
PT6332
OUTPUT DATA
KD1 TO KD25: KEY DATA
These bits represent the key output states when a key matrix with up to 25 keys is formed using the
KS1 to KS5 key scan output pins and the KI1 to KI5 key scan input pins. When a key is pressed, the bit
corresponding to that key will be set to 1. The correspondence is listed in the following table.
Item
KS1
KS2
KS3
KS4
KS5
KI1
KD1
KD6
KD11
KD16
KD21
KI2
KD2
KD7
KD12
KD17
KD22
KI3
KD3
KD8
KD13
KD18
KD23
KI4
KD4
KD9
KD14
KD19
KD24
KI5
KD5
KD10
KD15
KD20
KD25
SA: SLEEP ACKNOWLEDGE DATA
This output data is set to the state when the key was pressed. In that case DO will go to the low level.
If serial data is input during this period and the mode is set (normal mode or sleep mode), the IC will be
set to that mode. SA is set to 1 in the sleep mode and to 0 in the normal mode.
SLEEP MODE
The IC is set to sleep mode by setting either S0 or S1 in the control data to 1. The segment outputs and
the digit outputs are all set low, and the clock generator (oscillator circuit) is stopped (although it is
restarted when a key is pressed), and thus power dissipation is reduced. This mode is cleared by
setting S0 and S1 in the control data to 0.
In sleep mode, the status of segment/general purpose output port will not be changed.
PT6332 V1.0
- 15 -
February, 2006