Pin description (continued) – Rainbow Electronics MAX1494 User Manual
Page 9
MAX1492/MAX1494
3.5- and 4.5-Digit, Single-Chip ADCs
with LCD Drivers
_______________________________________________________________________________________
9
Pin Description (continued)
PIN
MAX1492
MAX1494
NAME
FUNCTION
24
21
SEG10
LCD Segment 10 Driver
25
25
BP3
LCD Backplane 3 Driver
26
26
BP2
LCD Backplane 2 Driver
27
27
BP1
LCD Backplane 1 Driver
28
29
V
NEG
-2.42V Charge-Pump Output. Bypass V
NEG
to GND with a 0.1µF capacitor.
—
22
SEG11
LCD Segment 11 Driver
—
23
SEG12
LCD Segment 12 Driver
—
24
SEG13
LCD Segment 13 Driver
—
28
V
DISP
Temperature-Compensation Voltage Input for LCD. If not using temperature
compensation, connect V
DISP
to GND. See the V
DISP
LCD Compensation section.
MAX1494
BINARY-TO-BCD
CONVERTERS
AND
LCD DRIVERS
ADC
INPUT
BUFFERS
-2.5V
AIN+
AIN-
REF+
REF-
+2.5V
AV
DD
DV
DD
V
DISP
2.048V
BANDGAP
REFERENCE
OSCILLATOR/
CLOCK
SCLK
DIN
DOUT
EOC
SEG1
SEG13
BP1
BP2
BP3
CLK
CS
SERIAL I/O AND CONTROL
+2.5V
GND
A = 1.22
TO
CONTROL
CHARGE
PUMP
-2.5V
LOWBATT
V
NEG
Figure 1. MAX1494 Functional Diagram