| Title | (Invited Paper) 1-cc Computer Using UWB-IR for Wireless Sensor Network |
| Author | *Tatsuo Nakagawa, Masayuki Miyazaki, Goichi Ono, Ryosuke Fujiwara, Takayasu Norimatsu, Takahide Terada (Hitachi, Japan), Akira Maeki, Yuji Ogata, Shinsuke Kobayashi, Noboru Koshizuka, Ken Sakamura (YRP Ubiquitous Networking Lab., Japan) |
| Page | pp. 392 - 397 |
| Abstract | An ultra-small, high-data-rate, low-power 1-cc
computer (OCCC) with an UWB-IR (ultra-wideband
impulse-radio) transceiver was developed for a wireless sensor
network. Thanks to bear-chip implementation and a flexible
printed circuit board, the size of the computer is only 1 cm3. To
achieve 10-Mbps data rate, a middle-class 32-bit microcontroller,
which has both a bus interface and a USB 2.0 controller, was
selected. Low-power techniques, such as transition of
microcontroller status to standby mode by using an external
real-time clock during wait times, power shutdown of halted
circuits, and detailed control of UWB-IR transceiver status, are
applied. The effect of these low-power techniques is verified by
measuring the time history of current consumption of the OCCC.
It was confirmed that the OCCC can provide wireless
communication at a transmission rate of 258 kbps over a distance
of 30 m. |