Understanding Smart Sensors - Nomads.usp

388 Understanding Smart SensorsState machines (continued)open/closed loop, 154Static accuracy, 56Stiction, 29Stochastic analog-to-digital (SAD)converters, 65Strain-gauge pressure sensors, 50Successive approximation register(SAR), 100, 101Surface acoustical wave (SAW) devices, 183defined, 183delay line oscillators, 64illustrated, 184uses, 183vapor sensors, 265See also RF sensingSurface micromachining, 18, 25–31bulk and LIGA comparison, 33bulk machining combined with, 30–31CMOS compatibility, 18defined, 25example illustration, 28particulate control, 30piezoelectric sensor, 42polymer films, 42process steps, 28small spacing, 29squeeze-film damping, 29stiction, 29technology, 25uses, 25, 29See also MicromachiningSurface-mounted devices (SMDs), 235Surface-mounted packaging, 236–37Surface-mount technology (SMT), 228, 236Switched-capacitor amplifier, 77–78circuit, 78performance, 78System on a chip (SOC), 94Tape-automated bonding (TAB), 231TCP/IP, 303–4Telemetry, 192–95defined, 192medical, 194piston temperature, 193–94race car, 192–93RF, 195tire pressure/temperature, 193uses, 192–93Telestethoscope, 304Temperature coefficient of resistance(TCR), 38Temperature sensing, 252–56diode response time, 255–56for fault conditions, 253independent shutdown, 255integrated polysilicon diodes, 255MOSFET integration, 255octal serial switch (OSS), 253temperature limit, 253Testing, 227cost, 244cost, reducing, 245EMI, 269silicon pressure sensor, 240smarter sensors, 244–45tests, 240–41Thermionic emitters, 217–19Time-division multiple access (TDMA), 179Time processor unit (TPU), 105Timers, 97Time-triggered protocol (TTP), 129Topologiesbus, 121defined, 120Transducer bus interface module(TBIM), 292Transducer electronic data sheet(TEDS), 3, 284–85areas, 284–85calibration, 286–87, 292calibration-ID, 292channel, 292channel-ID, 292data block structure, 287defined, 274general layout of, 286IEEE P1451.4, 293, 294memories, 285meta, 292meta-ID, 292P1451.3-defined, 292physical unit representation in, 289–91types of, 285