Page 290 – Electronics-Lab.com

WL-SIQW high efficiency infrared light source

Posted on 15 March, 2021 by mixos

Würth Elektronik has complemented its infrared product range with the new WL-SIQW SMT Infrared QFN LED Waterclear product series. The LEDs in Quad Flat No Leads (QFN) format are available in 2720, 3535 and 3737 packages with different radiant intensities from 125 to 800 mW/sr and in 90°, 120° or 150° beam angles.

Depending on the application, the infrared sources are available in wavelengths of 850 or 940nm.

The SMT-mountable WL-SIQW components are suitable for a wide range of applications in the fields of infrared cameras, night vision, surveillance and security solutions, as well as face and motion detection, or biometric identification. With the compact QFN format, Würth Elektronik achieves excellent thermal properties for the powerful LEDs and ensures stable, reliable contacts on standard solder pads.

All WL-SIQW SMT Infrarot QFN LEDs are available from stock without a minimum order quantity. Würth Elektronik provides developers with free samples.

16 High Power LEDs Knight Rider Light – Arduino Compatible

Posted on 13 March, 2021 by mixos

This is a Knight Rider LED Light and it is one of the best Arduino projects for beginners. This board drives 16 high-power LEDs to turn them ON one by one sequentially. This is an open-source Arduino compatible project that contains 16 high current MOSFETs, Atmega328 microcontroller, 5V regulator etc. The gate of IRLR7843 MOSFETs is connected to the I/O pins of the Atmega328 chip. Screw terminals are provided to connect the LEDs and power supply. Additional 2 x tactile switches and one connector for analog input are provided for further experiments. Operating power supply 12V to 15V DC, each output can drive 1A constant current load (1W to 12 W LED) without cooling and load up to 2A with forced cool air.

16 High Power LEDs Knight Rider Light – Arduino Compatible – [Link]

High Accuracy Adjustable Overvoltage and Overcurrent Protectors using MAX17561

Posted on 13 March, 202113 March, 2021 by mixos

If you need safe power to run your project, then this circuit is a possible solution for you. This project provides protection to your system device against over-current, over-voltage, under-voltage, thermal overload, and reverse current flow control to the system device. Basically, this project can play a key role between the power supply and the sensitive system device, where the system device will be protected against the above conditions. When there is a change other than the set parameters the circuit will disable the output and go in retry mode, until the condition is as per the set value. The project is built using MAX17561 chip. Refer to the datasheet to get further information. Refer to the schematic shown below and have look at some of the panorama of the project explained below.

High Accuracy Adjustable Overvoltage and Overcurrent Protectors using MAX17561 – [Link]

TSV792 – High bandwidth (50MHz) Low offset (200µV) Rail-to-rail 5V Op amp

Posted on 13 March, 2021 by mixos

The TSV791 and TSV792 are single and dual 50 MHz-bandwidth unity-gain-stable amplifiers. The rail-to-rail input stage and the slew rate of 30 V/µs make the TSV791 and TSV792 ideal for low-side current measurement. The excellent accuracy provided by maximum input voltage of 200 µV allows amplifying accurately small-amplitude input signal. The TSV792 can operate from a 2.2 V to 5.5 V single supply; it can typically handle an output capacitor up to 1 nF and is fully specified on a load of 22 pF, therefore allowing easy usage as A/D converters input buffer.

Features

Gain bandwidth product 50 MHz, unity gain stable
Slew rate 30 V/µs
Low input offset voltage 50 µV typ., 200 µV max.
Low input bias current: 2 pA typ.
Low input voltage noise density 6.5 nV/√Hz @ 10 kHz
Wide supply voltage range: 2.2 V to 5.5 V
Rail-to-rail input and output
Extended temperature range: – 40 °C to +125 °C
Automotive-grade version available
Benefits:
- Accuracy of measurement virtually unaffected by noise or input bias current
- Signal conditioning for high frequencies

more information: https://www.st.com/en/amplifiers-and-comparators/tsv792.html

MPM3860 Step-Down Power Module can achieve 6 A of continuous output

Posted on 13 March, 2021 by mixos

MPS’ MPM3860 1.2 MHz ultra-thin module can achieve 6 A of continuous output current over a wide input range with excellent load and line regulation

MPM3860 from Monolithic Power Systems is a fully integrated, high-frequency, synchronous, rectified, step-down power module with an internal inductor. It offers a very compact solution to achieve 6 A of continuous output current over a wide input range with excellent load and line regulation. The device has synchronous mode operation for higher efficiency over the output current load range. Full protection features include short-circuit protection (SCP), overcurrent protection (OCP), undervoltage protection (UVP), and thermal shutdown. The MPM3860 features constant on-time (COT) control operation, providing very fast transient response and easy loop design, as well as very tight output regulation. It is available in a QFN-24 (4 mm x 6 mm) package.

Features:

Wide 2.75 V to 7 V operating input range
6 A output current
Fixed 1200 kHz switching frequency
External programmable soft-start time
EN and power good for power sequencing
OCP and hiccup mode
Thermal shutdown
Internal power MOSFETs
Output adjustable from 0.6 V
High-efficiency synchronous mode operation
Pre-biased start-up
Forced CCM mode for low V_OUT ripple
Available in a QFN-24 (4 mm x 6 mm) package

Video

more information: https://www.monolithicpower.com/en/mpm3860.html

pixxiLCD series from 4D Systems

Posted on 13 March, 2021 by mixos

The new pixxiLCD graphic displays from 4D Systems are the ideal solution for easy integration. Due to the wide range of options offered by the embedded displays, developers can find the right full-color HMI for almost any application. The series is available at Rutronik UK.

4D LABS-configurable PIXXI-28 or PIXXI-44 GPUs enable a variety of functions, including touch detection, microSD or serial flash memory, GPIO and ADC, with multiple millisecond timers, UART and I²C communication.

The displays are offered in different shapes and sizes, such as round (with 1.3’’) or rectangular versions with 2’’, 2.5’’ or 3.9’’. In addition, depending on the requirements of the application, there is a choice option between capacitive and non-touch displays.
The pixxiLCD embedded graphic displays have a standard 15-pin ribbon cable connector in 0.5mm pitch with ZIF socket interface, through which UART, I/O, I²C and the power supply with reset signals are led from/to the display. The 4D Workshop4 IDE developer software, which is compatible with all available pixxiLCD displays, offers extensive possibilities for programming the system.

Features

1.3″, 240×240 pixel, slim Intelligent Display Module with embedded PIXXI-28 processor.
Non-Touch
IPS Display with Wide Viewing Angles
Suitable for fast and easy integration of a full colour HMI into any application or product.
Starter Kits available for first time users.
See product description below for more details.

more information: https://4dsystems.com.au/pixxilcd-13p2

Switch debounce circuit uses only one gate

Posted on 13 March, 2021 by mixos

The circuit in Figure 1 produces a single debounced pulse each time you press S₁. Moreover, the circuit uses only logic power from the remote pull-up resistor, R₂. You can use the circuit to detect when a key is pressed in a non-energized device, such as a device in a system that’s just coming up from standby.

The circuit operates as follows: Assume that you have not yet pressed S₁ and that C₁ is in a charged state. Under these conditions, R₁ drives IC₁ toward V_SS (ground), causing the IC to consume virtually no power. This action allows V_OUT to remain near 5 V. However, when you press S₁, C₁ rapidly discharges and drives IC₁ toward V_DD. Under these circumstances, IC₁ conducts heavily, pulling V_OUT near 0 V until R₁ charges C₁ enough to again drive IC₁ toward V_SS. Once C₁ charges sufficiently, IC₁ goes to V_SS and stops drawing power. This action unloads V_DD and causes V_OUT to return to a high state. D₁ to D₃, in conjunction with R₃, shifts the level of V_OUT for improved compatibility with CMOS logic.

[source: https://www.edn.com/switch-debouncer-uses-only-one-gate/]

AMS AG TMF8805 ToF 1D time-of-flight sensor

Posted on 13 March, 202113 March, 2021 by mixos

The TMF8805 is a time-of-flight (TOF) sensor in a single modular package with associated VCSEL

The TMF8805 is a time-of-flight (TOF) sensor in a single modular package with associated VCSEL. The TOF device is based on SPAD, TDC, and histogram technology. The device achieves a 2500 mm detection range.

Key features

Direct ToF technology with high sensitivity SPAD detection
20…2500 mm distance sensing at 30 Hz
On-chip histogram processing
Industry’s smallest modular OLGA 2.2 x 3.6 x 1.0 mm package

Additional features

Fast Time-to-Digital Converter (TDC) architecture
Sub-nanosecond light pulse
940nm VCSEL Class 1 Eye Safety
High-performance on-chip sunlight rejection filter and algorithm

Additional Benefits

Delivers high SNR, wide dynamic range, and no multi-path reflections
Enables dark and sunlight environment distance measurement within ±5%
Provides best-in-class resolution ranging mode detection sensing
Enables accurate distance measurements
Provides high accuracy, greater distance between cover glass, dynamic cover glass calibration, dirt or smudge removal and crosstalk compensation
Eye-safety circuitry stops VCSEL driver if VCSEL fault occurs
Optical filters with algorithm support enable high ambient light resilience
Reduce board space requirements, enables low-profile system designs in restricted space Industrial Designs

Internal Diagram

more information: https://ams.com/tmf8805

Texas Instruments TMUX6219 Single Channel 2:1 (SPDT) Switch

Posted on 13 March, 2021 by mixos

Texas Instruments TMUX6219 Single Channel 2:1 (SPDT) Switch is a complementary metal-oxide semiconductor (CMOS) switch in a single channel, 2:1 (SPDT) configuration. The device works with single supply (4.5V to 36V), dual supplies (±4.5V to ±18V), or asymmetric supplies (such as V_DD = 8V, V_SS = –12V). The TMUX6219 supports bidirectional analog and digital signals on the source (Sx) and drain (D) pins ranging from V_SS to V_DD.

The Texas Instruments TMUX6219 can be enabled or disabled by controlling the EN pin. When disabled, both signal path switches are off. When enabled, the SEL pin can be used to turn on signal path 1 (S1 to D) or signal path 2 (S2 to D). All logic control inputs support logic levels from 1.8V to V_DD, ensuring both TTL and CMOS logic compatibility when operating in the valid supply voltage range. Fail-Safe Logic circuitry allows voltages on the control pins to be applied before the supply pin, protecting the device from potential damage.

The TMUX6219 is part of the precision switches and multiplexers family of devices. These devices have very low on and off leakage currents and low charge injection, allowing them to be used in high precision measurement applications.

Block Diagram

Features

±4.5V to ±18V dual supply range
4.5V to 36V single supply range
2.1Ω low on-resistance
-10pC low charge injection
330mA (maximum) high current support
–40°C to +125°C operating temperature
1.8V logic compatible
Fail-safe logic
Rail-to-rail operation
Bidirectional signal path
Break-Before-Make switching

more information: https://www.ti.com/product/TMUX6219

Elektor Project: Wi-Fi for LoRa Switch

Posted on 12 March, 2021 by mixos

Clemens Valens @ Elektor Labs writes:

We published a remote-controlled switch in the March/April 2020 edition of Elektor magazine. It had state feedback and communicated using LoRa. Because it was housed in a waterproof IP66 enclosure, it was suitable for outdoor use. It was also a modular project with the relay and power circuitry on one board and the LoRa communication part on another.

This interested me, because I was looking for an outdoor switch that could be integrated easily into my home automation system. This system is based on Home Assistant and Wi-Fi, but not LoRa. I am sure it is possible to add LoRa to it, but I didn’t want to dive into that. Instead, I thought that by simply replacing the LoRa module with a Wi-Fi module, I could make it run ESPHome, which works great with Home Assistant (Figure 1).

Elektor Project: Wi-Fi for LoRa Switch – [Link]