PT6332 Datasheet, PDF (23/37 Pages) Princeton Technology Corp – VFD Driver/Controller IC

VFD Driver/Controller IC
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PT6332
RELATIONSHIP BETWEEN THE SEGMENT AND DIGIT OUTPUTS
GR1
GR2
GR3
E xa mple 1 S G1 to SG7 2
E xa mple 2 S G1 to SG7 2
E xa mple 3 S G1 to SG7 2
t3
t3
t3
t2
t4
t1
t2 t4
t1
t4
t2
t1
t3
t3
t3
t2
t4
t1
t2 t4
t1
t4
t2
t1
Figure 7
VFL
VSS
VFL
VSS
VFL
VSS
VFL
VSS
VFL
VSS
VFL
VSS
• Figure 7 shows the case where the display data is set up so that the segment outputs SG1 to SG56
output the VSS level with the same timing as the GR1 and GR3 digit outputs, and output the VFL
level with the same timing as the GR2 digit output. Here, the segments corresponding to GR2 will
be turned on. The relationship between t3 and the oscillator frequency fosc in this case is
t3=2048/fosc.
• The SG1 to SG56 segment output waveforms in example 1 correspond to a dimmer data (DM0 to
DM9) set to 3FE_H. The relationship between t1 and the oscillator frequency fosc is t1=2/fosc. Note
that t1 and t2 in example 1 are identical times.
• The SG1 to SG56 segment output waveforms in example 2 correspond to a dimmer data (DM0 to
DM9) set to a smaller value. Although t1 does not change, t2 becomes longer. Here, if the dimmer
data (DM0 to DM9) is set to 1FF_H and the oscillator frequency fosc is 2.4MHz, then t2 can be
calculated as follows.
t2 = t3 − t1× (1FF_H + 1)
= ¹⁰²⁴
fosc
= 0.43[ms]
• If the dimmer data (DM0 to DM9) is set to an even smaller value, t2 will become even longer as
shown in example 3. Note that t1 does not change in this case as well.
PT6332 V1.0
- 23 -
February, 2006