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Generate Code 128B in Software Copyright 2003 by The McGraw-Hill Companies, Inc. Click Here for Terms of Use.

Copyright 2003 by The McGraw-Hill Companies, Inc. Click Here for Terms of Use.
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n this chapter, we will present a number of new and interesting special-purpose microprocessor integrated circuits used for timekeeping, video display, infrared (IR) decoding, temperature measurement, memory, remote control and data acquisition, etc. This chapter is not about a specific STAMP 2 project but rather is an introduction and/or idea generator for utilizing many new or special-purpose serial integrated circuits for creating enhanced STAMP 2 projects, including remote control and data acquisition. The special IC chips covered in this chapter will permit you to expand your horizons for creating future STAMP 2 projects. All of the integrated circuits in this chapter are dedicated microprocessor chips designed for a specific purpose. All of the IC chips covered in this chapter utilize either 1- or 2-wire serial control and are easy to interface to your STAMP 2 controller. Almost all of these support chips are readily available as support and add-on products from Parallax as well as third-party suppliers. These IC chips will add a unique and powerful dimension to your STAMP 2 projects. Most of these special-purpose chips are covered in detail on the CD-ROM in App. 1 as well as under application notes.
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Dallas DS1302 Real-Time Clock Chip
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The DS1302 is a real-time clock/calendar with 31 bytes of static RAM, all on an 8-pin DIP integrated circuit (see Fig. 3-1). The real-time clock counts seconds, minutes, hours, date of the month, month, day of the week, and year with leap year compensation. The DS1302 requires 5 V, and uses less than 300 nA at 2.5 V. The DS1302 communicates with a microcontroller such as STAMP through a three-wire serial connection. A temporary connection to a controller establishes the DS1302 s time. Thereafter, the chip can operate as a standalone clock. The DS1302 has dual power supply pins for primary and backup, the latter of which may be powered by a supercapacitor input or rechargeable battery. The project relies on the chip s primary power supply input (Vcc2). The DS1302 interfaces with controllers through a three-wire connection, consisting of a serial clock (SCLK) for data input, input/output line (I/O) for connection to the clock input,
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Figure 3-1 Real-time clock chip.
DALLAS DS1620 DIGITAL THERMOMETER/THERMOSTAT 39
and reset (RST) for turning on control logic, which accesses the shift register and provides a method of terminating either single-byte or multiple-byte data transfer. The DS1302 s X1 and X2 pins are connected to the leads of the 32.768-kHz crystal. In order have a STAMP communicate with the DS1302, you will need to first identify clock starting time by using different variable time registers. Next, you must reset the chip and send it an instruction telling it the starting time. Then, you need to read the time from the chip and debug it to the PC. Finally, you will need to deactivate RST after each step by taking it low.
Dallas DS1620 Digital Thermometer/Thermostat
The DS1620 is a complete digital thermometer on an 8-pin DIP chip, capable of replacing the normal combination of temperature sensor and analog-to-digital converter in most applications. The digital thermometer chip is depicted in Fig. 3-2. It can measure temperature in increments of 0.5 degrees Celsius ( C) from 55 C to 125 C. On the Fahrenheit ( F) scale, it measures increments of 0.9 F over a range of 67 F to 257 F. Temperature measurements are expressed as 9-bit, 2 s complement numbers. The DS1620 communicates with a microcontroller such as the PIC or STAMP through a three-wire serial connection. The DS1620 can also operate as a stand-alone thermostat, if desired. A temporary connection to a controller establishes the mode of operation and high/low temperature set points. Thereafter, the chip independently controls three outputs: T(high), which goes active at temperatures above the high temperature set point; T(low), active at temperatures below the low set point; and T(com), which goes active at temperatures above the high set point and stays active until the temperature drops below the low set point. The DS1620 interfaces with controllers through a 3-wire connection, consisting of a data input/output line (DQ), a synchronizing clock line (CLK), and a reset/select line (RST). The figure shows how to connect the DS1620 to the PIC or STAMP for the demo
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