data sheet 291837 issue 2 plessey semiconductors ltd tamerton road | roborough | plymouth | devon | pl6 7bq 1 PS25401A / b epic ultra high impedance movement sensor data sheet 291837 issue 2 fig. 1 the ps25401b sensor fig. 2 internal circuit of epic movement sensor ordering informat ion ps25401b custom package -25c to +75c plessey semiconductors electric potential integrated circuit (epic) product line targets a range of applications. the ps25401b is an ultra high impedance non-contact solid state electric potential sensor. it can be used to detect field disturbance due to the movement of a near-by object. this functionality can be employed in a range of applications including security motion sensors and non-contact electric switches for lighting, door opening, toys etc the device uses active feedback techniques to both lower the effective input capacitance of the sensing element (cin) and boost the input resistance (rin). these techniques are used to realise a sensor with a frequency response suitable for remote sensing applications. features ? ultra high effective input resistance, typically 2 0g . ? effective input capacitance as low as 15pf. ? upper 3db point typically 10khz. ? operates with bipolar power supply from 2.4v to 4.0v. ? sensors supplied in a custom package with exposed pins for surface mount assembly. applications ? proximity switching of lighting and similar electr ic circuits ? remote control of tvs and other domestic appliance s ? presence detection for security / alarm systems ? room occupancy detection for rescue services ? simple gesture recognition to control children?s t oys ? controller-less computer gaming systems
PS25401A / b data sheet 291837 issue 2 plessey semiconductors ltd tamerton road | roborough | plymouth | devon | pl6 7bq 2 electrical characteristics t amb = -25c to +75c,vdd/vss 2.4v to 4.0v. the elec trical characteristics are guaranteed by either pro duction test or by design and characterisation. they apply within the specified ambient temperature and supply voltage unless otherwise stated. value characteristics min. typ. max. units conditions supply voltage 2.4 4.0 v bipolar supply, gnd=0v supply current 1.5 2.5 3.5 ma effective input resistance 20 g effective input capacitance 15 pf as measured at the sensor electrode voltage gain (av) 50 when measured with 250pf coupling capacitance lower -3db point 0.20 hz set by internal dc signal rejection network ? coupling capacitor 250pf upper -3db point 10.0 khz noise tbd 0.2hz 10khz -3db 0.2hz 10khz -3db fig. 3 typical bode plot for ps25401b sensor with c oupling through 250pf capacitor
PS25401A / b data sheet 291837 issue 2 plessey semiconductors ltd tamerton road | roborough | plymouth | devon | pl6 7bq 3 pin assignment top view output pin 1 vss pin 4 gnd pin 2 vdd pin 3 top view output pin 1 vss pin 4 gnd pin 2 vdd pin 3 fig. 4 pin assignment for the ps25401b ? top view mechanical dimensions the package diagram is shown below. it is recomme nded that a solder pad 1.6mm diameter be defined for the mounting of the sensor pins. bottom 2.93 0.06 side 1.0 10.50 0.08 7.80 0.64 10.50 0.08 7.80 0.64 1.35 0.35 1.35 0.35 1.35 0.35 1.35 0.35 bottom 2.93 0.06 side 1.0 10.50 0.08 7.80 0.64 10.50 0.08 7.80 0.64 1.35 0.35 1.35 0.35 1.35 0.35 1.35 0.35 fig. 5 mechanical drawing (all dimensions are nomin al and in mm)
PS25401A / b data sheet 291837 issue 2 plessey semiconductors ltd tamerton road | roborough | plymouth | devon | pl6 7bq 4 electrostatic discharge (esd) protection the ps25401b is manufactured using a high performan ce analog cmos process. as for all cmos components, it is essential that conventional esd p rotection protocols be applied for the handling of this device. patents this component and many of the associated applicati ons are covered by the following international patents: 602 32 911.6-08 (de) au2007228660 ca2646411 cn200780026584.8 ep1451595 (ch) ep1451595 (es) ep1451595 (fr) ep1451595 (ie) ep1451595 (it) ep1451595 (nl) ep2002273 ep2047284 ep2174416 gb1118970.1 jp2009-500908 jp4391823 tw097126903 tw1308066 us12/293872 us12/374359 us12/669615 us13/020890 us13/163988 us7885700
plessey semiconductors ltd. (plymouth) tamerton road | roborough | plymouth devon | united kingdom | pl6 7bq phone: +44 1752 693000 fax: +44 1752 693200 e-mail: info@plesseysemiconductors.com plessey semiconductors ltd.(swindon) design & technology centre | delta 500 delta business park | great western way swindon | united kingdom | sn5 7xe phone: +44 1793 518000 fax: +44 1793 518030 e-mail: info@plesseysemiconductors.com for further information about this and other produc ts, please visit: www.plesseysemiconductors.com legal notice product information provided by plessey semiconduct ors limited (?plessey?) in this document is believe d to be correct and accurate. plessey reserves the right to change/corr ect the specifications and other data or informatio n relating to products without notice but plessey accepts no liability for errors that may appear in this document, howsoever occurring, or liability arising from the use or application of any informat ion or data provided herein. neither the supply of such information, nor the purchase or use of products conveys any license or permission under patent, copyright, trademark or ot her intellectual property right of plessey or third parties. products sold by plessey are subject to its standar d terms and conditions of sale that are available o n request. no warranty is given that products do not infringe the intellectua l property rights of third parties, and furthermore , the use of products in certain ways or in combination with plessey, or non-plessey furnished equipments/components may infringe intel lectual property rights of plessey. the purpose of this document is to provide informat ion only and it may not be used, applied or reprodu ced (in whole or in part) for any purpose nor be taken as a representation re lating to the products in question. no warranty or guarantee express or implied is made concerning the capability, performa nce or suitability of any product, and information concerning possible applications or methods of use is provided for guid ance only and not as a recommendation. the user is solely responsible for determining the performance and suitability of the product in any application and checking that any sp ecification or data it seeks to rely on has not been superseded. products are intended for normal commercial applica tions. for applications requiring unusual environme ntal requirements, extended temperature range, or high reliability cap ability (e.g. military or medical applications), sp ecial processing/testing/conditions of sale may be availa ble on application to plessey.
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