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参数资料
| 型号： | DEMOAPEXSENSOR |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 18/20页 |
| 文件大小： | 0K |
| 描述： | BOARD DESIGN ALTITUDE PRESSURE |
| 标准包装： | 1 |
| 传感器类型： | 加速计，压力，水位，高度计/气压计 |
| 传感范围： | 多范围 |
| 接口： | I²C，SPI，模拟 |
| 灵敏度： | 多重 |
| 电源电压： | 10 V |
| 嵌入式： | 是，MCU，8 位 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MPX2102，MPXV5004G，MPL115A2，MMA7361L |
| 产品目录页面： | 2808 (CN2011-ZH PDF) |
Figure 9 and Figure 10 are examples of water measurement. In the hot water heater to the left, although the temperature of
the water can be high, a long enough tube combined with air column separation provides a buffer for measurement. Water and
Air are good insulators, so temperature variation can be quite drastic in a short distance. This is a design advantage in isolating
the sensor from heat.
In Figure 10 the diagram has a method to improve resolution of the water level. The vertical height measurement is kept
constant, but the volume of water dispensed or left in the bottom is improved. This is done by simply making a conical bottom.
The resolution in vertical height can be used to improve the volume measurement. Additional ADC counts per a volume of water
are achieved, than a shape with a broad based bottom.
AUTO ZERO
A summary of the application note AN1636 is that the offset of the pressure sensor can change during board mount, stress,
or temperature shifts. By sampling the offset pressure (voltage output with no pressure input) and storing this value in the MCU,
the changes in the offset are negated. This improves the overall accuracy of the voltage output of the sensor, since the offset
changes are negated. Normally this would occur in a final product when there is a startup or a cycle when the sensor is not
pressurized.
CALIBRATION
The best calibration would be a two part calibration. A Pressure would be taken at 0 mm of H 2 O and also when the tubing is
at 40 cm of H 2 O. The difference in ADC counts divided by 40 cm will give the number of ADC counts per a cm etc. for each sensor.
This is the best calibration, but is not implemented on the DEMOAPEXSENSOR in software rev 1.0.
First Point: 0 Level, Water Surface
Second Point: Bottom of Container
Figure 11. Two Part Calibration
AN3956
Sensors
Freescale Semiconductor
18
相关PDF资料 |
PDF描述 |
|---|---|
| DIL-CL-1A81-9-13M | RELAY TELECOM SPST 500MA |
| DIP05-1A72-11D | RELAY REED SPST 1A 5V |
| DIP2415R | RELAY SSR 1.5A 20-280VAC RNDM |
| DK-1511-001/BL | CABLE RJ45 CAT5E W/BOOT 1' BLK |
| DK-1511-001/B | CABLE RJ45 CAT5E W/BOOT 1' BLUE |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DEMO-AT3/4-XX32 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:AT-32032 and AT-41532 demonstration for 800-900 MHz applications |
| DEMO-AT32063 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:860 MHz cascode amplifier |
| DEMO-AT3XX11 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:AT-31011 2400 MHz 2 stage LNA amplifier; can also be used for AT-30511 or AT-32011 |
| DEMO-AT3XX33 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:900 MHz single stage LNA amplifier using AT-32033; circuit can also be used for AT-30533 or AT-31033 |
| DEMO-ATF3616-3 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:2 to 2.4 GHz single stage LNA using ATF-36163 |
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