Rainbow Electronics MAX1494 - Manual (Page 16)

MAX1492/MAX1494
3.5- and 4.5-Digit, Single-Chip ADCs
with LCD Drivers
16 ______________________________________________________________________________________
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, d ON
g OFF
a, g ON
d OFF
g, d ON
a 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 OR V DISP
V LCD = D VDD - V DISP (MAX1494)
V LCD = D VDD - GND (MAX1492)
Figure 10. LCD Voltage Waveform—Combinations 5–8 (BP_, SEG2/5/8)