MAX1492 Maxim, MAX1492 Datasheet - Page 12

• Manufacturer Part Number: MAX1492
• Description: 3.5- and 4.5-Digit / Single-Chip ADCs with LCD Drivers
• Manufacturer: Maxim

and 5 show the assignment of the 4.5-digit display seg-
ments, and Figures 6 and 7 show the assignment of the
3.5-digit display segments.
The voltage waveforms of the backplane lines and Y
segment line (Figure 3) have been chosen as an exam-
ple. This line intersects with BP1 to form the a segment,
with BP2 to form the g segment, and with BP3 to form
the d segment. Eight different ON/OFF combinations of
3.5- and 4.5-Digit, Single-Chip ADCs
with LCD Drivers
Figure 4. Backplane Connection for the MAX1494 (4.5 Digits)
Figure 5. Segment Connection for the MAX1494 (4.5 Digits)
12
______________________________________________________________________________________
SEG12: F4, E4, DP4
SEG11: A4, G4, D4
HOLD
SEG10: B4, C4, BC5
SEG13: PEAK, HOLD, N.C.
SEG9: F3, E3, DP3
HOLD
SEG8: A3, G3, D3
PEAK
PEAK
the a, g, and d segments and their corresponding
waveforms of the Y segment line are illustrated in
Figures 9 and 10. The schematic diagram in Figure 8
shows each intersection as a capacitance from seg-
ment line to common line. Figure 11 illustrates the volt-
age across the g segment.
The RMS voltage across the segment determines the
degree of polarization for the liquid crystal material and
SEG7: B3, C3, MINUS
LOW BATT
SEG6: F2, E2, DP2
LOW BATT
SEG5: A2, G2, D2
SEG4: B2, C2, LOWBATT
SEG3: F1, E1, DP1
SEG2: A1, G1, D1
SEG1: B1, C1, N.C.
BP1
BP2
BP3
ANNUNCIATOR