MAX1492 Datasheet, PDF(26/35 Page) Maxim Integrated Products – 3.5- and 4.5-Digit, Single-Chip ADCs with LCD Drivers

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MAX1492 Datasheet, PDF (26/35 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

LCD Segment-Display Register 3 (Read/Write):

MSB

PEAK

HOLD

BC_

Default values: 00h

The LCD segment-display register 3 is an 8-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

D4:

Segment d Driver Bit of Digit 4. The

default value turns on the LCD segment

(MAX1494 only).

G4:

Segment g Driver Bit of Digit 4. The

default value turns on the LCD segment

(MAX1494 only).

A4:

Segment a Driver Bit of Digit 4. The

default value turns on the LCD segment

(MAX1494 only).

C4:

Segment c Driver Bit of Digit 4. The

default value turns on the LCD segment

(MAX1494 only).

LSB

the LCD segment-display register determine if a seg-

ment is on or off. Write a 0 to turn on a segment and a 1

to turn off a segment.

B4:

BC_:

HOLD:

PEAK:

Segment b Driver Bit of Digit 4. The

default value turns on the LCD segment

(MAX1494 only).

Segment bc_ Driver Bit. For the

MAX1494, this bit enables BC5. For the

MAX1492, this bit enables BC4. The

default value turns on the LCD segment.

HOLD-Sign Driver Bit. The default value

turns on the HOLD annunciator.

PEAK-Sign Driver Bit. The default value

turns on the PEAK annunciator.

ADC Custom Offset-Calibration Register (Read/Write):

MSB

D15 D14 D13 D12 D11 D10 D9 D8

Default values: 0000h

In addition to automatic offset calibration, the

MAX1492/MAX1494 offer a user-defined custom-offset

16-bit read/write register. The final result of the ADC

conversion is the input after autocalibration minus the

LSB

D7 D6 D5 D4 D3 D2 D1 D0

value in the custom offset. The custom offset value is

stored in this register. D15 is the MSB. The data is rep-

resented in twoâs complement format.

ADC Result-Register 1 (Read Only):

MSB

D15 D14 D13 D12 D11 D10 D9 D8

Default values: 0000h

The ADC result-register 1 is a 16-bit read-only register.

This register stores the 16 MSBs of the ADC result. The

data is represented in twoâs complement format.

LSB

(MAX1492)

LSB

(MAX1494)

D7 D6 D5 D4 D3 D2 D1 D0

For the MAX1494, the data is 16-bit and D15 is the

MSB. For the MAX1492, the data is 12-bit, D15 is the

MSB, and D4 is the LSB.

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