Jennic’s JN5139 wireless microcontroller unit has been used by Gloucestershire based electronics consultancy firm MicroWatt to give its KnowWatt energy monitoring systems reliable RF data links.
The JN5139 is optimised for low power operation, and boasts a work rate of 3MIPS for every mA of current that it draws. The device has a 32-bit RISC core, 192kB of ROM and 96kB of RAM. It incorporates a 4-input 12-bit analogue-to-digital converter, two 11-bit digital-to-analogue converters, and a temperature sensor within its 8x8mm, 56-lead, QFN package. The integrated 2.4GHz transceiver is fully compliant with the IEEE 802.15.4 communications standard, with support for bi-directional data transfer at rates of up to 250kb/s over a choice of 16 different channels.