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参数资料
| 型号： | 412101 |
| 厂商： | TT electronics Semelab Limited |
| 英文描述： | Visible Light Detector |
| 中文描述： | 可见光检测器 |
| 文件页数： | 9/11页 |
| 文件大小： | 1045K |
| 代理商： | 412101 |
412101
Visible Light Detector
Preliminary Datasheet
REVISION A
This document is the property of Semefab (Scotland) Ltd. And is furnished in
confidence and upon the condition that it is neither copied or released to a third
party without prior consent.
Page 7 of
11
Coil current = 56mA. Min base current to switch on TR2 = 0.56ma. so R3 = 10K.
Min base current of TR1 = 0.56ma/200 = 2.8uA.
With the above value for R3, the quiescent current when the relay is off would be around
0.6mA which might be too high for some battery operated circuits.
Fig 7. The relay coil is energised when light > Slux. In this case the quiescent current is low
in dark conditions because TR1 is switched OFF at the same time as TR2 and the relay coil.
The customer can control the current to the application and the quiescent current by choosing
a normally open (NO) or normally closed (NC) relay.
Interface Circuit Examples
Fig 8 shows an interface to a microprocessor. The voltage across R1 varies linearly with the
illumination of the sensor. The current between the Vdd and Vss pins is approximately
1uA/lux, so with a 10K resistor the voltage at the A/D input will be 10mV per lux. The 412101
was designed for low lux applications and the headroom required between Vdd and Vss
becomes a problem at higher lux levels. These parts are not ideally suited to control room
lighting applications especially if the microprocessor supply voltage is low. For higher lighting
applications such as the control of room ambient lighting or backlighting applications for TVs,
computers or mobile phones a lower gain version is planned.
Fig 9. This circuit uses a transistor to provide a light level switching interface between the
412101 and CMOS logic. The switching threshold is set by R1 and the base of TR1 as
explained for previous circuit examples. The OUT signal will be high when the illumination is
above the threshold and low when it is below the threshold. Using a buffer instead of an
inverter will change the polarity of the OUT signal
Fig 10. This circuit uses a comparator (or op-amp) to provide a level switching interface for
the 412101. OUT will be high when the voltage at Vss < 0.1*Vdd.
FIG 11. Same as Fig 10 except that OUT will be high when the voltage Vss > 0.1*VDD
FIG 12. The op-amp circuit amplifies the output voltage at Vss.
VOUT = (1 + R3/R2) Iphoto*R1
相关PDF资料 |
PDF描述 |
|---|---|
| 41661-0388 | 416610388 |
| 41661-0402 | 416610402 |
| 41661-0001 | KK 156 Hdr Assy Flat Bkwy 02 ckt 15 SAu |
| 41661-0002 | KK 156 Hdr Assy Flat Bkwy 03 ckt 15 SAu |
| 41661-0003 | KK 156 Hdr Assy Flat Bkwy 04 ckt 15 SAu |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 412-101243 | 制造商:Power-One 功能描述:RPF5 COVER |
| 412-102A | 制造商:LG Corporation 功能描述:DECK MECH DH-05V |
| 412-106011 | 功能描述:插入式交流适配器 6VDC/100MA 3.5mm M RoHS:否 制造商:Phihong 地区:Universal 安装风格:Wall, Interchangeable Plug 输入电压范围:90 VAC to 264 VAC 输出端数量:1 输出功率额定值:5 W 输出电压（通道 1）:5 V 输出电流（通道 1）:1 A 直流输出连接器:USB Type A 随附/必需的交流插头:Required 商用/医用:Commercial 效率:Level V |
| 412-106021 | 功能描述:插入式交流适配器 6VDC 200MA 3.5MM RoHS:否 制造商:Phihong 地区:Universal 安装风格:Wall, Interchangeable Plug 输入电压范围:90 VAC to 264 VAC 输出端数量:1 输出功率额定值:5 W 输出电压（通道 1）:5 V 输出电流（通道 1）:1 A 直流输出连接器:USB Type A 随附/必需的交流插头:Required 商用/医用:Commercial 效率:Level V |
| 412-106051 | 功能描述:插入式交流适配器 6VDC/500MA 3.5mm M RoHS:否 制造商:Phihong 地区:Universal 安装风格:Wall, Interchangeable Plug 输入电压范围:90 VAC to 264 VAC 输出端数量:1 输出功率额定值:5 W 输出电压（通道 1）:5 V 输出电流（通道 1）:1 A 直流输出连接器:USB Type A 随附/必需的交流插头:Required 商用/医用:Commercial 效率:Level V |
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