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High Accuracy Adjustable Overvoltage and Overcurrent Protectors using MAX17561

Posted on 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 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 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 VOUT 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 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 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 VSS (ground), causing the IC to consume virtually no power. This action allows VOUT to remain near 5 V. However, when you press S1, C1 rapidly discharges and drives IC1 toward VDD. Under these circumstances, IC1 conducts heavily, pulling VOUT near 0 V until R1 charges C1 enough to again drive IC1 toward VSS. Once C1 charges sufficiently, IC1 goes to VSS and stops drawing power. This action unloads VDD and causes VOUT to return to a high state. D1 to D3, in conjunction with R3, shifts the level of VOUT 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 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 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 VDD = 8V, VSS = –12V). The TMUX6219 supports bidirectional analog and digital signals on the source (Sx) and drain (D) pins ranging from VSS to VDD.

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 VDD, 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 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]

Analog Devices Inc. ADPD188BI Integrated Optical Module

Posted on by mixos

Analog Devices Inc. ADPD188BI Integrated Optical Module is a complete photometric system for smoke detection using optical dual wavelength technology. The module integrates a highly efficient photometric front end, two light emitting diodes (LEDs), and two photodiodes (PDs). The module is housed in a custom package to prevent light from going from the LED to the photodiode without entering the smoke detection chamber.

The front end of the application specific integrated circuit (ASIC) consists of a control block, a 14-bit analog-to-digital converter (ADC) with a 20-bit burst accumulator, and three flexible, independently configurable LED drivers. The control circuitry includes flexible LED signaling and synchronous detection. The analog front end (AFE) features best-in-class rejection of signal offset and corruption due to modulated interference commonly caused by ambient light. The data output and functional configuration occur over a 1.8V I2C interface or serial peripheral interface (SPI) port.

Features

  • 3.8mm x 5.0mm x 0.9mm module with integrated optical components
  • 1 blue LED, 1 IR LED, and 2 photodiodes
  • 2 external inputs for other sensors (for example, CO and temperature)
  • 20-bit burst accumulator enabling 20 bits per sample period
  • Three 370mA LED drivers
  • On-board sample to sample accumulator enabling up to 27 bits per data read
  • Optimized SNR for signal limited cases
  • I2C or SPI communications

Video

more information: https://www.analog.com/en/products/adpd188bi.html

Würth Elektronik WSEN-HIDS Humidity Sensor

Posted on by mixos

Würth Elektronik WSEN-HIDS Humidity Sensor utilizes a calibrated and temperature-compensated digital output with low energy requirement to measure humidity and temperature with long-term stability. The WSEN-HIDS humidity sensor is based on advanced micro-electro-mechanical systems (MEMS) technology and is only 2mm x 2mm x 0.9mm in size. This sensor features an integrated analog-to-digital converter and temperature sensor, which can be connected to commonly used microcontrollers via an I2C or SPI interface. The software development kit offers a fast and easy way to individually set data rates and use the interrupt pin. The small size and minimized energy requirement of Würth Elektronik WSEN-HIDS Humidity Sensor make it suitable for data loggers, as well as stationary and portable Internet of Things (IoT) applications. For modern applications, Würth Elektronik offers developers an evaluation board.

Features

  • MEMS-based capacitive sensing principle
  • 0% to 100% relative humidity range
  • Embedded analog-to-digital converter
  • Fully calibrated 16-bit humidity and temperature output
  • I2C and SPI communication interface
  • Selectable output data rate up to 12.5Hz
  • -40°C to +120°C operating temperature range

more information: https://www.we-online.com/catalog/en/WSEN-HIDS

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