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using the mCP3202/mCP3208 Family oF a-to-d ConVeRteRs
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There are times when we need to get really serious about reading in a variable to a high resolution. If the variable can be expressed as a voltage between 0 and 5 volts, it can be read into the Propeller to a resolution of 12 bits with a chip identified as the MCP3202. (The 3208 is an eight-line version of the 3202.) This chip allows us to read a channel very rapidly, at 100,000 cycles per second (cps), and is available in versions that read two, four, and eight channels. It is a single-wire device. All these chips need a four-wire interface that meets the Serial Peripheral Interface (SPI) standard (go to the Internet to read more on the SPI standard).
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The MCP3202 and MCP3208 are shown in Figure 16-5. Chips that read more than two channels need to have more pins to accommodate the additional channels. Before you consider using the MCP3202 or the MCP3208 in any of your projects, download the data sheet to see if you can figure out what needs to be done to use the chip on your own. This is a particularly good opportunity to get familiar with data sheets because this is a simple chip that is relatively easy to understand and interface to. This ideal first-time Figure 16-5 The opportunity should not be wasted by us beginners. I will go MCP3202 and MCP over the details, but I strongly recommend that you try figur3208 pinouts ing it all out on your own to gain learning experience and confidence. Because the chip follows the SPI standard for serial peripheral chips, we talk to it in a serial format, as specified in the data sheet. Here is what we have to do:
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1. Get the wiring in place, as shown in Figure 16-7, later in this chapter. 2. Select the chip to make it active. This is done by pulling the Chip select line low
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from a high condition. If it is starting up in a low state, you have to make it high and then low to activate the startup sequence. 3. Tell the chip what mode we want to use it in. Four bits have to be either set or cleared. The four bits are toggled in one after the other and they specify the following conditions: a. To get going, we send the DataIn line a high start bit. b. Next, we specify whether we are using single or differential mode. c. We need to specify which channel we want to use. d. We need to specify whether we want the LSB or the MSB read first. Once this has been done, we are ready to read in the information to a variable that will store what we read. After receiving these bits, the 3202 sends out a low (null) bit. We read it and discard it. The next 12 bits are the data we are interested in. Here s what happens:
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1. Each bit is read in by making the clock go high to low. 2. Each time the clock goes low, the next bit of data becomes ready on the DataOut
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3. We read the data into our variable. 4. We shift the bits in our variable left by one bit to make room for the next bit to be
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read in.
5. We then make the clock go high and then low, and the next bit becomes ready to
read in.
6. We have to do all this 12 times to get all the 12 bits read in.
Reading a PotentiometeR: CReating an inPut We Can VaRy in Real time
The detailed code for reading the 3202 is shown in Program 16-3. This particular program also serves as an example of full documentation and line-by-line commenting.
Program 16-3 Reading the MCP3202 Analog-to-Digital Chip to a 12-Bit Resolution
{{03 Nov 09 Harprit Sandhu MCP3202Read1.Spin Propeller Tool 1.2.6 16 Program 3 All the code in this program is in Spin. This program reads channel 0 of the MCP3202 and displays the results on the LCD both as a decimal value and as a binary value so that you can see the bits flip as you turn the potentiometer. The 3202 chip is connected as follows: 1 Chip select 2 Channel 0 for voltage input from Pot 3 Channel 1 for voltage input from Pot, not used 4 Ground Vss 5 Data into 3202 for setup 6 Data out from 3202 to be read into Propeller 7 Clock to read in the data 8 Power 5 volts Vdd The Potentiometer is connected as follows: Left Ground Center To pin 2 of the 3202 Right Power 5 volts I used a 50K Pot The 1 2 3 4 5 6 7 8 9 10 11 12 13 14 connections to the LCD Ground Power 5 volts Ground P16 P17 P18 Not connected, using 4 Not connected, using 4 Not connected, using 4 Not connected, using 4 Data high nibble Data high nibble Data high nibble Data high nibble are as follows:
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