201305.pdf 43279KB May 08 2013 11:07:04 PM

productroundupSenSorS/TranSducerSProgrammable Hall switch from Diodes Incextends design flexibility↘The AH1898 programmable omnipolar Hall effect switch enables designersto use the same contactless detection circuit in multiple applications or withdifferent field strengths. It features a band-select pin, allowing device sensitivity tobe changed to one of two predefined magnetic sensitivity ranges, and has been optimizedfor use across a 1.6 to 3.6V low-voltage supply range with a hibernating clockingsystem to minimize power consumption. The device helps extend portable batterycelllifetime with an average supply current of 4.3 μA (typical) at 1.8V. The AH1898has an 8 kV ESD rating on supply and output pins, and a chopper stabilized designthat delivers temperature stability over the operating range of −40 to +85°C, absoluteminimum switch point drift, and enhanced immunity to RF noise and physical stress.The switch is available in the miniature 0.8×0.8-mm CSP package, with a 4-pinfootprint and integration of pull-up resistors that result in reduced external componentcounts and simplification of PCB layouts. Prices start at 20 cents (10,000).Diodes Inc, www.diodes.comMeasurement Specialties offers digital barometricsensor in a compact QFN package↘The MS5637 digital barometricpressure sensor uses an integrated24-bit ADC to precisely processpressure and temperature values inas little as 0.5 msec. A low powerdraw of 0.6 μA combined witha compact footprint of 3×3×0.9 mmmakes this high-resolution moduleideal for handheld,mobile devices.The MS5637’shigh-resolutiontemperature output enables operationas an altimeter or thermometer, and ahigh-linearity pressure sensor providesan altitude resolution of 13 cm at sealevel for accurate measurements.Standby power is less than 0.15 μA at25°C, supply-voltage ranges from 1.5 to3.6V, and the ADC interfaces withmicrocontrollers via an I 2 C interface.The sensor operates from 300 to 1200mbar over an extended temperaturerange of −40 to +85°C, with a longtermstability of ±1 mbar per year.Pricing for the MS5637 is less than $1(1 million). Delivery time is dependentupon quantity.Measurement Specialists,www.meas-spec.comNine sensors includedin contextual awarenesskit from InvenSense↘A contextual awareness systemdevelopment kit (CA-SDK)combines nine sensors and software ona 1.71×1.46-in. PCB configured into awearable watchband. Wearable sensorinnovations enable applicationsand productsto offer orientationtrackingand activity recognition.It can alsobe used in sleepmonitoring, posturedetection, and immediateenvironment detection applications.The kit features the MPU-9250nine-axis MotionTracking deviceand InvenSense’s algorithms forMotionFusion. It incorporates temperature,humidity, UV light, proximity,pressure, and light sensors, and comeswith an embedded motion-processinglibrary, USB port, onboard memory, andBluetooth module. The MPU-9250 willbe available in the summer of 2013, andprices start at $5.50 (1000).InvenSense, www.invensense.com[ www.edn.com]May 2013 | EDN 59