DSP, Micros & Memory


16-bit MCUs suit energy harvesting systems

28 October 2009 DSP, Micros & Memory

Microchip recently released the low cost, low pin count PIC24F04KA201 family of 16-bit microcontrollers – the latest to feature the company’s nanoWatt XLP (extreme low power) technology. With typical sleep currents as low as 20 nA, combined with small-footprint 14- and 20-pin package options, the devices are well suited for battery-powered and energy-harvesting applications.

The key to the PIC24F04KA201 MCUs’ 20 nA sleep currents is Deep Sleep mode. By isolating power to various circuits during sleep, Deep Sleep mode reduces power consumption to a minimum. Additionally, Deep Sleep gives designers the flexibility to customise their applications for the lowest power consumption through multiple internal wake-up sources, such as brown-out resets, interrupts and watchdog timers, all the while maintaining the I/O states.

Example applications for the new microcontrollers include: medical (portable and home medical devices, oxygen flowmeters, lifestyle/fitness monitors); industrial (energy harvesting/scavenging, water/gas/heat meters, portable gas sensors, remote sensor networks, asset tracking, sealed/harsh environment sensors); and consumer (security system dongles, sealed disposable electronics, portable electronics, smartcards).

The MCUs offer up to 16 MIPS operation using a 32 MHz internal clock, 4 KB Flash and 512 Bytes SRAM. They also feature a 10-bit (up to 9-channel) 500 KSps ADC, an mTouch capacitive touch sensing peripheral, two rail-to-rail comparators, as well as SPI, I²C and UART modules for serial communications.



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