By Stuart Ball
Analog Interfacing to Embedded Microprocessors addresses the applied sciences and strategies utilized in interfacing analog units to microprocessors, delivering in-depth insurance of useful keep an eye on functions, op amp examples, and lots more and plenty extra. A significant other to the author's renowned Embedded Microprocessor structures: genuine international layout, this new embedded platforms publication makes a speciality of size and keep an eye on of analog amounts in embedded structures which are required to interface to the true global.
At a time whilst sleek digital platforms are more and more electronic, a entire resource on interfacing the true international to microprocessors may still end up important to embedded platforms engineers, scholars, technicians, and hobbyists. someone eager about connecting the analog setting to their electronic machines, or troubleshooting such connections will locate this booklet specifically important. Stuart Ball is additionally the writer of Debugging Embedded Microprocessor platforms, either released by way of Newnes. also, Stuart has written articles for periodicals similar to Circuit Cellar INK, Byte, and sleek Electronics.
Provides hard-to-find details on interfacing analog units and applied sciences to the merely electronic international of embedded microprocessors.
Gives the reader the perception and point of view of a true embedded platforms layout engineer, together with suggestions that just a hands-on expert might know.
Covers very important issues for either and software program structures while linking analog and electronic devices.
Part of the Newnes Embedded know-how sequence.
Read Online or Download Analog Interfacing to Embedded Microprocessors: Real World Design PDF
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Extra info for Analog Interfacing to Embedded Microprocessors: Real World Design
The problem with the resistor ladder is that the accuracy of the resistors directly affects the accuracy of the conversion result. Although modern ADCs use very precise, laser-trimmed resistor networks (or sometimes capacitor networks), there are still some inaccuracies in the resistor ladders. The sigma-delta converter does not have a resistor ladder; the DAC in the feedback path is a single-bit DAC, with the output swinging between the two reference endpoints. This provides a more accurate result.
I 2C Bus The I2C bus uses only two pins: SCL (SCLock) and SDA (SDAta). SCL is generated by the processor to clock data into and out of the peripheral device. SDA is a bidirectional line that serially transmits all data into and out of the peripheral. The SDA signal is open-collector so several peripherals can share the same 2-wire bus. When sending data, the SDA signal is only allowed to change while SCL is in the low state. Transitions on the SDA line while SCL is high are interpreted as start and stop conditions.
We’ll use the same thermistor we’ve been using. 3, R1 = 10K. 273v Now, say that we want to measure temperature between 10 degrees and 40 degrees with an accuracy of at least three A/D steps per degree. 3 Thermistor scaling. 1 ADC steps per degree 30 degrees This is less than the resolution we wanted, so we have to scale the output. This involves amplifying the signal so that the 10-to-40 degree range we’re interested in spans the ADC voltage range. 976). 88. 67 volts. This is a 5v span, but it is outside the 0-to-5 volt range of the ADC.