MAX1492 Datasheet, PDF (24/35 Pages) Maxim Integrated Products – 3.5- and 4.5-Digit, Single-Chip ADCs with LCD Drivers

3.5- and 4.5-Digit, Single-Chip ADCs
with LCD Drivers
Table 6. LCD Priority Table
SEG_SEL
1
0
0
0
0
X = Don’t care.
SPI/ADC
X
1
0
0
0
HOLD
X
X
1
0
0
PEAK
X
X
X
1
0
DISPLAYS VALUES FROM
LCD Segment Registers
LCD Display Register (User Written)
LCD Display Register
Peak Register
ADC Result Register
Overrange Register (Read/Write):
MSB
D15 D14 D13 D12 D11 D10 D9 D8
Default values: 7CF0h (for MAX1492, +1999)
4E1Fh (for MAX1494, +19,999)
The overrange register is a 16-bit read/write register
(D15 is the MSB). When the conversion result exceeds
the value in the overrange register, the OVER bit in the
status register latches to 1. The LCD shows a 1 fol-
LSB
D7 D6 D5 D4 D3 D2 D1 D0
lowed by 4 dashes for the MAX1494 or a 1 followed by
3 dashes for the MAX1492 (see Table 4).
The data is represented in two’s complement format.
Underrange Register (Read/Write):
MSB
D15 D14 D13 D12 D11 D10 D9 D8
Default values: 8300h (for MAX1492, -2000)
B1E0h (for MAX1494, -20,000)
The underrange data register is 16-bit read/write regis-
ter (D15 is the MSB). When the conversion result falls
below the value in the underrange register, the UNDR
bit in the status register sets to 1. The LCD shows a -1
LSB
D7 D6 D5 D4 D3 D2 D1 D0
followed by 4 dashes for the MAX1494 or a -1 followed
by 3 dashes for the MAX1492 (see Table 4).
The data is represented in two’s complement format.
LCD Segment-Display Register 1 (Read/Write):
MSB
A2
G2
D2
F2
E2 DP2 ANN B1
Default values: 0000h
The LCD segment-display register 1 is a 16-bit
read/write register. When the SEG-SEL bit (in the con-
trol register) is set to 1, the MAX1492/MAX1494 provide
direct access to individual LCD segments. The bits in
LSB
C1
A1
G1
D1
F1
E1 DP1
0
the LCD segment-display register determine if a seg-
ment is on or off. Write a 0 to this register to turn on a
segment and a 1 to turn off a segment.
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