Tokyo, Japan Oki Electric Industry Co., Ltd. claims to have the developed the industry's thinnest ultra-small tri-axis accelerometer module by integrating the sensor chip with the control IC. Using micromachined technology in combination with silicon on insulator (SOI) wafers also contributed to the small size and high shock survivability of the module, said the company. This is Oki's first product for the MEMS market. The small footprint, measuring 5.0 x 5.0 x 1.4 mm, makes the new ML8950 module suitable for mobile handsets and other mobile equipment.
Oki's ML8950 module detects tri-axis acceleration, inclination and vibration and outputs the signal in a digital format. In addition to detecting the tri-axis (X, Y and Z) acceleration (+/-3g), the module can also detect inclination and impact shock as well as measure the degree of
inclination and vibration. Because Oki's tri-axis accelerometer module is highly sensitive, it can measure gravity at stasis and can detect instantaneous acceleration and inclination, said the company. Non linearity is ±1% and off-axial sensitivity is ±5%.
The control IC chip is equipped with a signal amplification circuit, a control circuit, an analog/digital converter and a temperature compensating circuit. In addition, it is the first
tri-axis accelerometer module to be equipped with a digital interface, which eliminates the need for an analog/digital signal converter on the equipment, and makes it easy to embed into digital equipment because it's directly connected to the CPU, said the company.
The module's supply voltage is 2.5 to 3.3 volts for analog and 1.8 to 3.3 volts for digital. The shock survivability rating is >4000 G. Current consumption is 1.5 mA (typical)/2.0 mA (maximum). Standby current is 5.0 μA at 70°C. Frequency response ranges from DC to 200 Hz. The operating temperature range is -20°C to 70°C.
Sample shipments will begin in Japan and North America in October 2004, followed by volume shipments in April 2005. Initial pricing for the device is approximately $45.00. Once volume production ramps up in April, the company expects pricing to drop to about $9.00 in quantities of 1,000.
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