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DESIGN IDEAS - CMOS IC Makes Low-Cost Digital Potentiometer - Power Management In The ST62 - Automatic Power-Off Circuit Saves Battery - Simple PC Smart Card Reader Enhancement - Digital Position Encoder Does Away With ADC - Single-Supply RS-232 Transmission Without Level-Translator ICs - µC Controls Charge Pump As Background Task - Clock Multiplier Circumvents PLL - Drive Smart Cards With A Low-Cost MCU's UART - Wireless “Battery” Energizes Low-Power Devices - Harvest Energy Using A Piezoelectric Buzzer - Drive A Single-Coil Latching Relay Without An H-Bridge Circuit DESIGN CONTESTS ARTICLES
CONTACT
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RFID PAYMENT TERMINAL
Article published in the Circuit Cellar
Magazine, Issue 211, February 2008 Carlos’s LM3S811-based handheld terminal makes contactless payments a reality. The terminal’s LCD—which shows the date and time—prompts you to enter payment amounts on the keypad. After transactions are complete, the log file stored on the device’s flash memory can be sent to a host system through an RS-232 interface. REAL-WORLD APPS "Last year, we challenged the embedded design community to get creative and make a concerted effort to design real-world applications that would make waves in 2008. This issue proves that the community has stepped up to the challenge and has begun to address the major technological topics of the twenty-first century: user-friendly wireless applications, cost-effective embedded applications, code efficiency, and renewable energy solutions. In keeping with the wireless communications theme, we include two articles that will help you develop wireless designs that feature simple master-to-slave interaction. Carlos Cossio describes his RFID payment terminal design on page 34. The well-designed, handheld terminal can be used for contactless payments in a variety of settings, ranging from a convenience store to a subway station." C.
J. Abate
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