On-Chip Integration of Pressure Plus 2-Axis (X/Z) Acceleration Composite TPMS Sensors with a Single-Sided Bulk-Micromachining Technique

On-Chip Integration of Pressure Plus 2-Axis (X/Z) Acceleration Composite TPMS Sensors with a Single-Sided Bulk-Micromachining Technique
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采用单面体微加工技术的压力加 2 轴 (X/Z) 加速复合 TPMS 传感器的片上集成

DOI:
10.3390/mi10070473
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发表时间:
2019-07
期刊:
影响因子:
3.4
通讯作者:
Song Fang
Song Fang
中科院分区:
工程技术3区
文献类型:
--
作者:
Wang Jiachou;Song Fang

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针对汽车轮胎压力监测系统(TPMS)的升级产品,提出并研制了一种新型的压力加2轴(X/Z)加速度复合传感器片上集成电路。在此,X轴加速度计具有悬臂梁-质量块结构,并且用于自动识别和定位四个车轮中的每个车轮。MIS的IC铸造兼容的低成本批量制造技术(即,微开口(内部蚀刻和密封)仅用于从(111)硅晶片的正面制造器件,无需双面微加工、晶片键合、复杂的腔体SOI(绝缘体上硅)加工以及昂贵的SOI晶片需要。该复合TPMS传感器采用普通单抛光片上的单片正面制作工艺,具有芯片尺寸小(1.9mm × 1.9mm)、串扰小、成本低、工艺兼容等优点。制作的压力传感器,X轴加速度计和Z轴加速度计,显示线性传感输出,与灵敏度分别为约0.102 mV/kPa,0.132 mV/kPa,和0.136 mV/kPa,分别。采用低成本的前端MIS工艺制造,所制造的复合材料TPMS传感器在汽车电子和批量生产中是有前途的。
A novel on-chip integration of pressure plus 2-axis (X/Z) acceleration composite sensors for upgraded production of automobile tire pressure monitoring system (TPMS) is proposed, developed, and characterized. Herein, the X-axis accelerometer is with the cantilever beam-mass structure and is used for automatically identifying and positioning each of the four wheels. The IC-Foundry-Compatible low-cost batch fabrication technique of MIS (i.e., Micro-openings Inter-etch and Sealing) is employed to only fabricate the device from the front side of (111) silicon wafer, without double-sided micromachining, wafer bonding, complex Cavity-SOI (Silicon on Insulator) processing, and expensive SOI-wafer needed. Benefited from the single-wafer front-side fabrication technique on ordinary single-polished wafers, the fabricated composite TPMS sensor has the advantages of a small chip-size of 1.9 mm × 1.9 mm, low cross-talk interference, low-cost, and compatible process with IC-foundries. The fabricated pressure sensors, X-axis accelerometer and Z-axis accelerometer, show linear sensing outputs, with the sensitivities as about 0.102 mV/kPa, 0.132 mV/kPa, and 0.136 mV/kPa, respectively. Fabricated with the low-cost front-side MIS process, the fabricated composite TPMS sensors are promising in automotive electronics and volume production.
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