MCP3301T datasheet(21/38 Pages) MICROCHIP

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 2011 Microchip Technology Inc.

DS21700D-page 21

MCP3301

6.0

SERIAL COMMUNICATIONS

6.1

Output Code Format

The output code format is a binary two’s complement

scheme with a leading sign bit that indicates the sign of

the output. If the IN+ input is higher than the IN- input,

the sign bit will be a zero. If the IN- input is higher, the

sign bit will be a ‘1’.

The diagram shown in Figure 6-1 shows the output

code transfer function. In this diagram, the horizontal

axis is the analog input voltage and the vertical axis is

the output code of the ADC. It shows that when IN+ is

equal to IN-, both the sign bit and the data word are

zero. As IN+ gets larger, with respect to IN-, the sign bit

is a zero and the data word gets larger. The full scale

output code is reached at +4095 when the input [(IN+)

- (IN-)] reaches VREF - 1 LSB. When IN- is larger than

IN+, the two’s complement output codes will be seen

with the sign bit being a one. Some examples of analog

input levels and corresponding output codes are shown

in Table 6-1.

TABLE 6-1:

BINARY TWO’S COMPLEMENT OUTPUT CODE EXAMPLES.

Analog Input Levels

Sign

Bit

Binary Data

Decimal

DATA

Full Scale Positive

(IN+)-(IN-) = VREF-1 LSB

1111 1111 1111

+4095

(IN+)-(IN-) = VREF-2 LSB

1111 1111 1110

+4094

IN+ = (IN-) +2 LSB

0000 0000 0010

IN+ = (IN-) +1 LSB

0000 0000 0001

IN+ = IN-

0000 0000 0000

IN+ = (IN-) - 1 LSB

1111 1111 1111

-1

IN+ = (IN-) - 2 LSB

1111 1111 1110

-2

IN+ - IN- = VREF+1 LSB

0000 0000 0001

-4095

Full Scale Negative

IN+ - IN- = -VREF

0000 0000 0000

-4096

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