This paper mainly introduces a design principle and implementation method of multi-channel optical power meter based on MSP430F2272 single-chip microcomputer . MSP430F2272 single-chip microcomputer has multi-channel analog input multiplexing port on-chip integrated 10-bit analog-to-digital converter, which can realize measurement under low power consumption conditions. Multi-channel optical signal power function. The entire design is simple and practical, easy to implement.
In optical communication, it is necessary to accurately measure the strong optical signal of the carrier in the optical fiber. The optical power meter is a meter based on this design that can detect the power of the optical fiber signal source. It is an indispensable practical application of optical fiber communication engineering and various scientific experiments. Measuring instrument.
The core computing and control devices of the optical power meter usually use the C51 series MCU powered by 5V. The system power consumption is relatively high. The C51 series MCU itself does not have an integrated A/D conversion module. The A/D conversion after signal acquisition requires an external chip. It not only occupies the I/O port of the MCU, but also increases the power consumption. It is not suitable for occasions with high power consumption requirements (such as outdoor). And the general optical power meter on the market is basically a single-channel measurement, and it is only necessary to continuously switch when measuring multiple optical signals, which is cumbersome and easily damages the device connector.
This design uses MSP430F2272 microcontroller to achieve multi-channel optical power measurement. The MSP430 series of microcontrollers is a 16-bit ultra-low-power, reduced instruction set (RISC) mixed signal processor from Texas Instruments Inc. (TI) with high processing power, fast operation, and high integration. The advantages of easy development and high price. The supply voltage of the MSP430F 2272 is only 1.8V to 3.6V, and the current at 2.2V/1 MHz is only 270μA. The system can provide or externally connect up to 16MHz clock signal, the instruction cycle is only 62.5ns, you can also use the internal digital oscillator (DCO) or external 32768Hz low-speed crystal, users can flexibly balance the choice of high performance and low power. The 10-bit 200kbps A/D converter is integrated on-chip and contains 16-bit timers TImerA and TImerB with three capture compares, and four 8-bit parallel multiplexed ports. The P1 and P2 ports have interrupt capability. With 32kB+256B Flash Memory, 1 kB RAM, support JTAG online programming and straight-through debugging.
1 Design principleAt present, there are two general methods for measuring optical power, one is a heat conversion type, and the optical power is calculated by using a black body to absorb the optical power and then increasing the temperature. The optical power meter has a flat spectral response curve and high accuracy, but has high cost and long response time and is generally used as a standard optical power meter. Another method is the semiconductor photoelectric detection method, which uses the photoelectric effect of the semiconductor PN junction to convert the optical signal into an electrical signal to calculate the optical power. Generally, the general optical power meter uses the second method to select the PIN photodetector to realize the optical power measurement through photoelectric conversion.
The design converts the measured optical signal into a current signal through the photoelectric PN junction photoelectric effect of the photodetector (PIN), and the I/V converted and amplified voltage signal is sent to the integrated A/D converter on the chip. It is a digital signal, and the measurement result is displayed on the liquid crystal after being processed in the single chip microcomputer. Figure 1 is a schematic block diagram.
Since the analog-to-digital converter is also integrated on the chip, the ultra-low power consumption of the MSP430 series of microcontrollers makes the power consumption of the whole system relatively low, and it can be powered by external power supply or battery.
0.8mm ( 0.031") Female Header Connector
Category:Board To Board Connectors
Sub-Category:Pin Header Female
Type:0.8mm
0.8mm ( 0.031") Female Headers Overview
Whenever there is a need for fitting small-sized connectors in compact devices, the 0.8mm pitch female header, or sometimes referred to as header connector, is ideally suited for this application. Not only does this female header space-savvy, but it is also designed for vacuum pick and place that makes it suitable for high volume automated manufacturing.
Antenk offers these low profile, easy-install, SMT or THM miniature female connector plugs at high quality and affordable China-quoted price, for board-to-board connection, snuggly fitting the pins of a male header and acting as a receptacle.
Assembly and service is simple with either vertical (straight), elevated or at a right angle configuration/orientation, which can dissipate current of about 1.0 A or less in a tape and reel packaging. The filleted corners can also remove shadowing allowing optimization of LED output.
Also, the 0.8mm pitch female headers are made to work in Arduino boards, Arduino Pro and Arduino Mega with either single or double-row female headers, facilitating connections for programming and incorporation into other circuits. They have the perfect height for clearing the USB-B connector and great for stacking multiple shields.
Female header always called as [Header connector", Antenk provide widely range of header connector, from 2.54mm (.100″ inch) pitch to 0.8mm (0.031 inch) pitch. The number of pins (contacts) is from 2 to 40 pins per orw. There are three type: Straight (Dip Vertical), Right angle, SMT (surface mount).
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Applications of 0.8mm Pitch Female Headers
Its small size is most suitable for PCB connections of small equipment and devices such as:
Arduino Boards
Architectural and sign lighting
Retail and display lighting
Fluorescent LED retrofit lighting
Cabinet or furniture lighting
Commercial / residential cove lighting
WiFi equipment
Gaming consoles,
Measurement instruments
Medical Diagnostic and Monitoring equipment
Communications: Telecoms and Datacoms
Industrial and Automotive Control and Test
Mount Type: Through-hole vs Surface Mount
At one side of this female header is a series of pins which can either be mounted and soldered directly onto the surface of the PCB (SMT) or placed into drilled holes on the PCB (THM).
Through-Hole (Poke-In)
Best used for high-reliability products that require stronger connections between layers.
Aerospace and military products are most likely to require this type of mounting as these products experience extreme accelerations, collisions, or high temperatures.
Useful in test and prototyping applications that sometimes require manual adjustments and replacements.
0.8mm vertical single row female header, 0.8mm vertical dual row female header, 0.8mm Elevated single row female header, 0.8mm Elevated dual row female Header, 0.8mm right-angle single row female header and 0.8mm right-angle dual row female header are some examples of Antenk products with through-hole mount type.
Surface-Mount
The most common electronic hardware requirements are SMT.
Essential in PCB design and manufacturing, having improved the quality and performance of PCBs overall.
Cost of processing and handling is reduced.
SMT components can be mounted on both side of the board.
Ability to fit a high number of small components on a PCB has allowed for much denser, higher performing, and smaller PCBs.
0.8mm Right-angle Dual Row female header, 0.8mm SMT Single row female header, 0.8mm SMT Dual row female header and 0.8mm Elevated Dual Row female Header are Antenk`s SMT female headers.
Soldering Temperature for 0.8mm Pitch Female Headers
Soldering SMT female connectors can be done at a maximum peak temperature of 260°C for maximum 60 seconds.
Orientation/Pin-Type: Vertical (Straight) and Right-Angle
0.8mm pitch female headers may be further classified into pin orientation as well, such as vertical or straight male header or right-angle female header.
Vertical or Straight Female Header Orientation
One side of the series of pins is connected to PCB board in which the pins can be at a right-angle to the PCB surface (usually called "straight" or [vertical") or.
Right-Angle Female Header Orientation
Parallel to the board's surface (referred to as "right-angle" pins).
Each of these pin-types have different applications that fit with their specific configuration.
PCB Connector Stacking
Profile Above PCB
This type of configuration is the most common way of connecting board-to-board by a connector. First, the stacking height is calculated from one board to another and measured from the printed circuit board face to its highest insulator point above the PCB.
Elevated Sockets/Female Headers
Elevated Sockets aka Stacked sockets/receptacles or Mezzanine are simply stacked female headers providing an exact distance requirement between PCBs that optimizes electrical reliability and performance between PCB boards.
Choosing this type of stacking configuration promotes the following benefits:
Connector Isolation - the contacts are shrouded preventing cable connection mishaps and good guidance for the mating header connectors.
For off-the-shelf wireless PCB module, stacking height is optimized with elevated sockets.
Offers superior strength and rigidity.
Polarisation prevents users from inverted insertion.
Single, Dual or Multiple Number of Rows
For a 1.0mm straight or vertical female header, the standard number of rows that Antenk offers ranges from 1 to 2 rows. However, customization can be available if 3 ,4 or n number of rows is needed by the customer. Also, the number of contacts for the single row is about 2-40 pins while for dual row, the number contacts may vary from 2-80 pins.
Pin Material
The pins of the connector attached to the board have been designed with copper alloy. With customer`s demand the pins can be made gold plated.
Custom 1.0mm Pitch Female Headers
Customizable 1.0 mm pitch female headers are also available, making your manufacturing process way faster as the pins are already inserted in the headers, insulator height is made at the right size and the accurate pin length you require is followed.
Parts are made using semi-automated manufacturing processes that ensure both precision and delicacy in handling the headers before packaging on tape and reel.
Tape and Reel Packaging for SMT Components
Antenk's SMT headers are offered with customizable mating pin lengths, in which each series has multiple number of of circuits, summing up to a thousand individual part number combinations per connector series.
The tape and reel carrier strip ensures that the headers are packaged within accurately sized cavities for its height, width and depth, securing the headers from the environment and maintaining consistent position during transportation.
Antenk also offer a range of custom Tape and reel carrier strip packaging cavities.
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ShenZhen Antenk Electronics Co,Ltd , https://www.antenkconn.com