read barcode from image c#.net CH0-CH7 AGND Dout SSTRB DGND Vdd Vss REFADJ Vref in Software

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CH0-CH7 AGND Dout SSTRB DGND Vdd Vss REFADJ Vref
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Input to the reference buffer amplifier. Reference voltage for AD conversion. Also output of the reference buffer amplifier ( 4.096 volts). Also, input for an external precision reference voltage source.
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To clock the control byte into the ADC, the CS* pin is pulled low and a rising edge on SCLK clocks a bit into Din. The control byte format requires that the first bit to be shifted in should be 1 . This defines the beginning of the control byte. Until this start bit is clocked in, any number of 0 can be clocked in by the SCLK signal without any effect. The control byte must be 1XXXXXX11 (binary). Xs denote the bits required for channel and conversion mode selection. The two least-significant bits are set to 1 and 1 to select the external clock mode option. Figure 6.17 illustrates the control byte format. The control byte value for starting a conversion on channel 0 of the ADC, in unipolar, single-ended conversion mode using external clock, is 10001111 (binary) or 8F hex. Let s now consider the timing diagram in Figure 6.18, which illustrates the conversion and readout process on ADC channel 0. The timing diagram illustrates five traces, namely CS*, the chip select signal; SCLK, the serial clock required for programming the ADC and the subsequent readout; the Din, which carries the programming information (the control byte); the SSTRB, which the ADC generates to indicate the beginning of the readout process; and Dout, the actual data output from the ADC, which is the conversion result. The data on signal Din is clocked into the ADC at the rising edge of the SCLK signal.
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120 HARDWARE AND SOFTWARE INTERFACING WITH THE AVR
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START: The first logic 1 bit after CS* goes low defines the start of the Control byte SEL2, SEL1, SEL0: These 3 bits select which of the 8 channels will be used for conversion UNI/BP*: 1=Unipolar; input can range between 0 to +Vref; 0=Bipolar; input can range between +Vref/2 to -Vref/2 SGL/DF*: 1=single ended; 0=Differential PD1, PD0: Defines clock & power down modes. 0 0 1 1 0 : Full power down mode 1 : Fast power down mode 0 : Internal clock mode 1 : External clock mode
Figure 6.17 MAX186 control byte format.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 SCLK
1 0 0 0 1 1 1 1 SSTRB 8 F
Dout X 0 1 1 0 1 1 1 0 1 1 0 0 0 0 0 6 E C
Figure 6.18 Timing diagram of a typical MAX186 conversion process as recorded on a logic analyzer.
INTERFACING ANALOG-TO-DIGITAL CONVERTERS 121
The first bit that is clocked in is D7. To begin the conversion, D7 needs to be set to 1 , as can also be seen from the value of the control byte that we calculated. So Din is set to 1 and the first SCLK rising edge is applied to the ADC. The SCLK is then taken low. Thereafter, the Din is set to each of the subsequent bits of the control byte before applying the SCLK. At the end of 8 SCLK pulses, the Din bit is not required and is set to 0 . At the falling edge of the 8th SCLK pulse, the ADC sets the SSTRB bit to 1 . At the falling edge of the 9th SCLK bit, SSTRB is taken to 0 . At the falling edge of the 9th SCLK signal, the ADC outputs data on the Dout signal, one bit for each of the next 15 falling edges of the SCLK signal. The data on the 9th pulse is 0 and the actual conversion result is effective after the 10th falling edge to the 21st rising edge. Thereafter, for the next 3 edges, the ADC outputs 0 s. For a controller circuit such as the AVR, with minimal parts, to initiate conversion and readout the result would need three output bits and one input bit. The output bits would be needed to generate the Din and SCLK signal and the input bit to read the Dout signal from the ADC. Figure 6.19 illustrates the circuit with a MAX186 ADC, an AT90S2313 processor, and a MAX232 RS-232 level translator. The circuit is connected to the PC serial port. The AVR processor waits for a command from the PC and then initiates conversion on the MAX186 and sends out the data back to the PC serial port. The program is available on the CD. The code for this project is available in the code directory in the file MX186_ex.asm.
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