March 4-7, 2018 Hilton Phoenix / Mesa Hotel Mesa, Arizona Archive
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1 March 4-7, 2018 Hilton Phoenix / Mesa Hotel Mesa, Arizona Archive 2018 BiTS Workshop Image: pilgrims49 / istock
2 COPYRIGHT NOTICE The presentation(s)/poster(s) in this publication comprise the Proceedings of the 2018 BiTS Workshop. The content reflects the opinion of the authors and their respective companies. They are reproduced here as they were presented at the 2018 BiTS Workshop. This version of the presentation or poster may differ from the version that was distributed in hardcopy & softcopy form at the 2018 BiTS Workshop. The inclusion of the presentations/posters in this publication does not constitute an endorsement by BiTS Workshop or the workshop s sponsors. There is NO copyright protection claimed on the presentation/poster content by BiTS Workshop. However, each presentation/poster is the work of the authors and their respective companies: as such, it is strongly encouraged that any use reflect proper acknowledgement to the appropriate source. Any questions regarding the use of any materials presented should be directed to the author(s) or their companies. The BiTS logo and are trademarks of BiTS Workshop. All rights reserved.
3 Applications for Embedded Micro Heaters in Printed Circuit Boards and MEMS Sensors Bruce P Mahler Ohmega Technologies, Inc. Conference Ready mm/dd/2014 BiTS Workshop March 4-7, 2018
4 Agenda Trends in micro heater applications Micro heater use in micro Total Analysis Systems (μtas s) Lab-On-Chip (LOC) versus Lab-On-PCB (LOP) Micro heater use in PCB substrate of other MEMS sensors Micro heater test data Illustrate two application examples using microheaters 2
5 Application Trends for Micro Heaters Microfluidic biological sensors In-Vitro diagnostic analysis DNA and RNA analysis Dissolved organic matter analysis in seawater Micro reactors for pharmaceutical development Portable point of care, rapid blood screening for contagions/diseases Gas sensing air quality 3
6 Micro Total Analysis Systems Growing demand for commercialization of micro Total Analysis Systems (μtas s) is requiring designers to reconsider the printed circuit board. Many Lab-On-Chip (LOC) devices have been successfully demonstrated but because of cost restrictions have failed to proliferate. Lab- On-PCB (LOP) is being recognized as a tangible solution. 4
7 Lab-On-Chip (LOC) Devices Produced by semiconductor processes on silicon or glass. Advantages Semiconductor fabrication techniques Highly integrated devices possible Biocompatible Very small footprint Disadvantages Expensive material and processing equipment Footprint limitations make point of care applications difficult Better suited for laboratory environments 5
8 Lab-On-PCB (LOP) Devices Lab-On-PCB devices include processors, MEMS sensors / microfluidic devices and require microheaters. Nickel Phosphorus (NiP) thin-film resistors as microheaters: Eliminate discrete chip resistors Allow custom micro heater footprints through subtractive print/etch Easily tunable resistance for power/heat requirements Localize heat to very small areas Provide reliable, long term use 6
9 Lab-On-PCB (LOP) Devices Produced using standard Printed Circuit Board processes. Advantages Global infrastructure using standardized processes and materials Quick prototyping and ramp to scale Heaters embedded in the printed circuit board Lower cost production Disadvantages May require assembly of additional components 7
10 NiP Thin-Film Resistors as Heaters in PCBs Aerospace & Defense SAL (semi-active laser) activation guided munitions XRF Spectrometer & Control board (Mars Beagle 2 lander) Satellite solar array deployment mechanism Biomedical Electronics Bioassay Drug vaporization for subcutaneous injections Heat therapy for dry eye PCB Temperature Control IC Testing/Burn-In 8
11 NiP Thin-Film Resistors as Heaters in PCBs Advantages of using NiP thin-film resistors are: Improved reliability (removal of solder joints) Fewer parts to assemble Custom resistor footprints Fast temperature rise times Low RTC characteristic <50 ppm/c (-65C to +125C) Stable values at high ambient temperatures (150C+) 9
12 NiP Thin-Film Resistors as Heaters in PCBs Application shows a heater used to bring the X-Ray Spectrometer (XRS) biasing and preamplification electronics to -50 degrees Celsius in the Mars Beagle 2 Lander. Images Courtesy of the University of Leicester Space Research Centre and the Beagle2 Consortium 10
13 NiP Thin-Film Resistors as Heaters in PCBs Example NiP heater array in a biomedical device 11
14 NiP Thin-Film Resistors as Heaters in PCBs Example 10 ohm/sq embedded heater array for IC Burn-In testing at 65C 12
15 NiP Thin-Film Resistors in High Volume Application NiP thin-film resistors have been extensively used for many years in MEMs Microphone PCBs. These devices are deployed in headsets, cellular phones and various voice controlled systems. Advantages of using NiP thin-film resistors are: Improved reliability (removal of solder joints) Fewer parts to assemble Small resistor footprints Less board area for components allowing for smaller and thinner PCBs Improved electrical performance (lower EMI) 13
16 NiP Thin-Film Resistors in MEMs Microphone Sensor 14
17 NiP Thin-Film Resistors in MEMs Microphone Sensor 15
18 NiP Thin-Film Resistors in MEMs Microphone Sensor MEMs Microphones 16
19 NiP Thin-Film Micro heater Testing Review measurements on relatively larger NiP macro heaters Temperature rise vs. power on NiP micro heater Temperature vs. rise time on NiP micro heater Temperature rise vs. NiP sheet resistivity 17
20 Temperature Rise vs Power for Larger NiP Thin- Film Resistors (Macroheaters) 18
21 PCB NiP Thin-Film Micro heater Definition For our discussion we define microheaters as resistive elements with an area less than 0.25 mm². For this particular study, the heater elements were constrained to a rectangular shape with an area of mm² (0.10 mm x 0.25 mm). 19
22 Macro Heaters Micro Heaters 20
23 Temperature Rise versus Power The tests were conducted comparing temperature versus power input for various NiP sheet resistivities. NiP resistor as heaters were tested at a fixed size of mm² (0.10 mm x 0.25 mm). The construction of the test boards were: Isola 370HR, core No backside cladding Clear solder mask 21
24 Temperature vs Power Data 22
25 Temperature vs Power Data 23
26 Temperature vs Power Data 24
27 Temperature vs Power Data Summary Chart 25
28 NiP resistor as heater illustration Concept Application Illustration Illustration showing NiP resistor/heater on inner layer. Surface mount footprint with thermal conduit pad in center. Illustration depicting heat flow on surface layer thermal pad from underlying NiP resistor/heater. 26
29 NiP resistor as heater illustration Concept Application Illustration Illustration showing NiP resistor/heater on inner layer. Cavity with various channels. Illustration depicting enclosed cavity in PCB with various channel access ports. 27
30 Study Summary NiP microheaters demonstrated good correlation between temperature rise and input power. The NiP microheaters required relatively low power and fast rise times to achieve maximum temperature. The temperature of the micro heater was limited by the maximum operating temperature of the substrate and protective conformal coating over the resistors. Higher temperature resistant substrates (for instance, polyimide) and copper heatsink planes near the resistive elements will allow for higher power and temperatures. Applications using NiP as microheaters are now under development/preproduction in both MEMs PCBs and Lab-on-PCBs with excellent initial results. 28
March 5-8, 2017 Hilton Phoenix / Mesa Hotel Mesa, Arizona Archive Session 4
March 5-8, 2017 Hilton Phoenix / Mesa Hotel Mesa, Arizona Archive Session 4 2017 BiTS Workshop Image: tonda / istock Copyright Notice The presentation(s)/poster(s) in this publication comprise the Proceedings
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