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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MCP3301T датащи(PDF) 21 Page - Microchip Technology |
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MCP3301T датащи(HTML) 21 Page - Microchip Technology |
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21 / 38 page  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 0 1111 1111 1111 +4095 (IN+)-(IN-) = VREF-2 LSB 0 1111 1111 1110 +4094 IN+ = (IN-) +2 LSB 0 0000 0000 0010 +2 IN+ = (IN-) +1 LSB 0 0000 0000 0001 +1 IN+ = IN- 0 0000 0000 0000 0 IN+ = (IN-) - 1 LSB 1 1111 1111 1111 -1 IN+ = (IN-) - 2 LSB 1 1111 1111 1110 -2 IN+ - IN- = VREF+1 LSB 1 0000 0000 0001 -4095 Full Scale Negative IN+ - IN- = -VREF 1 0000 0000 0000 -4096 |
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