Product Brief
Absolute pressure sensor is small enough for mobile devices
Ismini Scouras8/31/2010 11:04 AM EDT
Comment
Robert Ramey
Munich—Epson Toyocom Corp. has developed an extremely small absolute pressure sensor dubbed the XP-6000CA, which employs a QMEMS pressure-sensing structure that allows the sensor to squeeze into a tiny 7.0 × 5.0 × 2.0t mm package while providing total pressure accuracy (± 30 Pa) and high resolution (0.3 Pa).
The XP-6000CA quartz pressure sensor accurately detects height changes in 3-cm increments by sensing changes in pressure. It is well-suited for measuring instruments, and small enough to be used in mobile devices.
Key highlights:
- Total pressure accuracy: ±30 Pa Max.
- Resolution: 0.3 Pa
- Pressure measurement range: 30 kPa to 130 kPa
- Operating temperature range: -40ºC to +85ºC
- Size: 7.0 × 5.0 × 2.0t mm
- Temperature sensor Built-in
- Interface I2C
- Supply voltage +2.4 to +3.6 VDC
Samples will become available in October 2010.
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Robert Ramey
9/3/2010 11:42 AM EDT
OK let me get this straight.
Here is a sensor with a range of 100kPa and an accuracy of 30 Pa. Let's translate that in to inches of water to get an idea of what that really means:
100 kPA = 1 atmosphere = 30 * 12 inches of water. So accuracy of 30 Pa works out to:
(30 Pa / 100 kPA) * 360 = .1 inches of water. This seems (barely) believable. It's not clear how the resolution plays into this. Does it mean that if the output is calibrated then the part will be able to measure to .001 inches of water? Seems unlikely to me. Or does it mean that the resolution measures the least significant bit of the output but that you have to throw away some number of the least significant bits in any case?.
An indication of the price and current consumption would be interesting facts.
Robert Ramey
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