A Singlewire BiDirectional and Simultaneous Interface Architecture for

A Single-wire, Bi-Directional and Simultaneous Interface Architecture for Sensor System Jeong-Kyun Kim Dong-Woo Jee Department of Electrical and Computer Engineering, Ajou University, Suwon, Korea dwjee@ajou. ac. kr I. Abstract § Sensor system consists of sensor, amplifier, filter, ADC and DSP § Communicate 1 Mbps sensor data & 250 Kbps sensor configuration data § In wearable device, sensor system need low power consumption and small size and low noise § Applicable to various signal line lengths § Successfully perform a communication measurement § Conventional transceiver interface has large power consumption and large size § Proposed architecture is single signal line, Bi-directional and simultaneous transceiver circuit for wearable sensor system < Fig 1. Sensor system diagram > II. Proposed System III. Measurement result < Fig 2. Conventional I/O interface diagram (SPI) > < Fig 4. Measured results transmitted and received signals > < Fig 3. Proposed transceiver interface for sensor system > Conventional System § Required less 4 signal line(MISO, MOSI, SCLK, Select) § Large system size and large EMI noise Proposed System § Only one signal line for data communication § Small system size, low power consumption and noise < Fig 5. Chip photomicrograph and layout > IV. Result § § Proposed interface use only single signal line for bi-directional and simultaneous data communication Sensor data transmission to So. C transceiver is successfully demonstrated Implemented in 65 nm CMOS process occupy 0. 008 mm 2 and 0. 142 mm 2 for each sensor IC and So. C transceiver Consume 7. 1 μW and 145. 8 μW for each sensor IC and So. C transceiver