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1、50AN EMBEDDED SINGLE CHIPTEMPERATURECONTROLLER DESIGNJ. Jayapandian and Usha Rani RaviDesign Development & Services Section, Materials Science DivisionIndira Gandhi Centre for Atomic Research, Kalpakkam 603 102. Tamil Nadu. IndiaABSTRACTThis paper describes a single chip embedded temperature control
2、ler design programmedin a single Programmable System on Chip (PSoC); a mixed array logic consists of analog,digital and digital communication blocks within in it. The virtual instrument controlprogram written in LabVIEW ver.7.1, a graphical language, provides user friendly menudriven window based co
3、ntrol panel, interacts with the single PSoC chip design for sensingand controlling the temperature. This simple cost effective embedded design findspotential application in laboratory as well as in industries. This deign can also be madeas a standalone system without PC by programming LED/ LCD displ
4、ay and key padattachment modules in same PSoC chip.1. INTRODUCTIONThe advent of intelligent programmable embedded silicon designs provides the ability toimplement any required hardware programmatically for the design automation in industriesand laboratories. Recent trend in laboratory as well as in
5、industrial automation designs usesminimal hardware and maximum support of software. The programmable embeddedcomponents and application software available in the market enables the designer for userfriendlycost effective design solution for any system automation. Temperature controllersare playing v
6、ital role in industries and laboratories. To accurately control process temperaturewithout extensive operator involvement, a temperature control system relies upon a controller,which accepts a temperature sensor such as a thermocouple or RTD as input. It comparesthe actual temperature to the desired
7、 control temperature, or set point, and provides an outputto a control element. The controller is one of the major parts of the entire control system,and the whole system should be analyzed in selecting the proper controller. This paperdescribes a novel single chip temperature controller design with
8、 Cypress MicrosystemsProgrammable System on Chip (PSoC). Virtual instrument control program written in LabVIEWver.7.1 interacts with the embedded PSoC design and senses and controls the temperature offurnace / load.J. Instrum. Soc. India 38(1) 50-54512. PROGRAMMABLE SYSTEM ON CHIP (PSoC)While select
9、ing a microcontroller, it must have an easy and inexpensive interface tosensors, communication interfaces, and more. Cypress Programmable System-On-Chip (PSoC)architecture offers a flexible, economical solution for a wide variety of applications. This paperdescribes the design of a temperature contr
10、oller on a single CY8C27143, 8 pin PSoC chip. Asshown in fig.1, it features four main areas: PSoC core, digital system, analog system, andsystem resources including in/out ports. This architecture allows the user to create customizedperipheral configurations that match the requirements of each indiv
11、idual application. The UARTinterface, coupled with configurable analog and digital peripherals makes the CY8C27143 trulyuniversal in its connections to the external world. The PSoC core includes: an M8Cmicrocontroller; 32 Kbytes of program flash memory; 2 Kbyte of data RAM; internal 24 MHzoscillator
12、; sleep and watchdog timer; general-purpose input/ output pins (GPIO) allowing anypin to be used as digital input or output, and most pins to be used as analog inputs or outputs.Every pin can be used as a digital or analog interrupt. The digital system is made up of 8digital PSoC blocks. Each block
13、is an 8-bit resource that can be used alone or combined withother blocks to form peripherals. Possible peripherals include: PWMs (8- to 32-bit); PWMswith dead band (8- to 24-bit); counters (8- to 32-bit); UART 8-bit with selectable parity; SPImaster and slave; cyclical redundancy checker/generator (
14、8- to 32-bit); pseudo randomsequence generators (8- to 32-bit). These digital blocks can be connected to any of the GPIOthrough a series of global buses. These buses also allow for signal multiplexing and performinglogic operations. The analog system is made up of 12 configurable blocks, each compri
15、singan op amp circuit allowing the creation of complex analog signal flows. Analog peripheralsFig. 1 : Block diagram of Programmable System on Chip (PSoC) internal blocksAn embedded single chip temperature controller design52are very flexible and can be customized to support specific application req
16、uirements. Someof the more common PSoC analog functions are: filters (2- and 4- pole band-pass, low-pass,and notch); amplifiers (up to 2, with selectable gain to 48x); instrumentation amplifiers (1with selectable gain to 93x); comparators (up to 2, with 16 selectable thresholds); DACs (upto 2, with
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