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| 型号： | SI1120-A-GM |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 8/20页 |
| 文件大小： | 0K |
| 描述： | IC PROXIMITY/AMBIENT SEN 8ODFN |
| 标准包装： | 1 |
| 检测距离： | 19.7"（50cm）1.6' |
| 传感器类型： | 红外线 |
| 物体感测： | 非金属 |
| 响应频率： | 250Hz |
| 主体材料： | * |
| 屏蔽： | 无屏蔽 |
| 电源电压： | 2.2 V ~ 3.7 V |
| 输出类型： | PWM |
| 端子类型： | PC 引脚 |
| 封装/外壳： | * |
Si11 20
2.3. Proximity Modes
In proximity mode, an LED sends light pulses that are reflected from the target to a photodiode and processed by
the Si1120’s analog circuitry. Light reflected from a proximate object is detected by the receiver, and the Si1120
converts the light signal into a pulse at the PRX output of a duration proportional to the amount of reflected light.
The LED is turned off at the trailing (rising) edge of the PRX pulse. The detection cycle may be aborted before the
end of the PRX pulse by bringing STX low. This allows the system designer to limit the maximum LED “on” time in
applications where high reflectivity periods are not of interest, thus saving power and minimizing the LED duty
cycle. Aborting the detection cycle at a set time also enables fast threshold comparison by sampling the state of the
PRX output at the trailing (falling) edge of the STX input. An active (low) PRX output when STX falls means that an
object is within the detection range. Forcing a shorter detection cycle also allows a faster proximity measurement
rate thus allowing more samples to be averaged for an overall increase in the signal-to-noise ratio.
For long-range detection, PRX400 mode is selected. For short-range detection, PRX50 mode is selected. PRX50H
mode is typically used in short-range, single-optical-port applications where the internal optical reflection level is
high. The greater reflectance range combined with a lower LED power prevents internal reflections from saturating
the receiver circuit.
The offset calibration mode works the same way as the other proximity modes but without turning on the LED. This
allows precise measurement of the environment and Si1120 internal offsets without any LED light being reflected.
The offset calibration mode also allows compensation of drifts due to supply and temperature changes.
Figure 3. Proximity Mode Timing Diagram
Figure 4. Proximity Mode Timing Diagram (Aborted Cycle)
8
Rev. 1.0
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SI1120-A-GMR | 功能描述:近程传感器 Proximity/Ambient Light Snsr w/PWM Out RoHS:否 制造商:Vishay Semiconductors 感应方式:Optical 感应距离:1 mm to 200 mm 电源电压:2.5 V to 3.6 V 安装风格:SMD/SMT 输出配置:Digital 最大工作温度:+ 85 C 最小工作温度:- 25 C 系列:VCNL3020 |
| SI1120EK | 功能描述:光学传感器开发工具 Si1120 Eval Kit RoHS:否 制造商:ams 工具用于评估: 接口类型: 最大工作温度: |
| SI1120-EK | 制造商:Silicon Laboratories Inc 功能描述: |
| SI1125QR | 制造商:Thomas & Betts 功能描述:SPLICE AUTO SEIZE |
| Si1132-A10-GMR | 制造商:Silicon Laboratories Inc 功能描述:SENSOR DGTL UV INDEX QFN 制造商:Silicon Laboratories Inc 功能描述:I2C UV Index Ambient Light Sensor |
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