Rainbow Electronics MAX1495 - Manual (Page 13)

MAX1491/MAX1493/MAX1495
3.5- and 4.5-Digit, Single-Chip
ADCs with LCD Drivers
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φ1 φ2 φ3 φ1' φ2' φ3'
V+
V H
V L
V-
V+
V H
V L
V-
V+
V H
V L
V-
V+
V H
V L
V-
V+
V H
V L
V-
V+
V H
V L
V-
V+
V H
V L
V-
V LCD
BP1
BP2
BP3
ALL
OFF
a ON
g, d OFF
g ON
a, d OFF
d ON
a, g OFF
FREQUENCY = 107Hz
φ1, φ2, φ3 - - BP HIGH WITH RESPECT TO SEGMENT (BP+ TIME)
φ1', φ2', φ3' - - BP LOW WITH RESPECT TO SEGMENT (BP- TIME)
BP1 ACTIVE DURING
φ1 AND φ1'
BP2 ACTIVE DURING φ2 AND φ2'
BP3 ACTIVE DURING φ3 AND φ3'
V+ = DV DD , V H = 2/3 DV DD
V L = 1/3 V LCD , V- = GND
V LCD = DV DD - GND
Figure 9. LCD Voltage Waveform—Combinations 1–4 (BP1/2/3, SEGa/d/g)