Texas Instruments recently introduced two 65-V, 150-mA synchronous DC/DC buck converters for powering factory automation and automotive sensor applications. Featuring 10.5-µA quiescent current (IQ), the converters are intended for applications requiring high efficiency. The LM5165 (industrial-grade) and LM5165-Q1 (automotive-grade) micro-power step-down regulators feature a wide input voltage (VIN) range and dual control modes for optimizing efficiency and PCB area.
Features and benefits
Low 10.5-uA standby IQ (operating with no load) enables 90% conversion efficiency at 1-to-10-mA loads to extend battery life in “always on” applications.
100% duty cycle enables low-dropout operation, while a P-channel high-side MOSFET eliminates the bootstrap diode and capacitor.
Dual-mode operation: a pulse frequency modulation (PFM) control mode enables the highest efficiency power supply design, while a constant on-time (COT) control mode provides higher output current and better EMI performance.
Fixed 3.3- and 5-V options eliminate external feedback resistor dividers to lower BOM.
Programmable current limit optimizes inductor size and cost.
The industrial-grade LM5165 costs $1.35 in 1,000-unit quantities. The automotive-grade LM5165-Q1 costs $1.58.
The BIS-3922 improves on HABEY’s BIS-6922 system by offering additional I/O for more applications and solutions. The system is well suited for automation, digital signage, network security, point of sale, transportation, and digital surveillance applications.
The BIS-3922 system includes six DB9 COM ports on the front panel, one of which supports RS-232/-422/-485. HABEY’s proprietary ICEFIN design ensures maximum heat dissipation and a true fanless system.
The BIS-3922 system is built with the Intel QM77 chipset and is compatible with the third-generation Ivy Bridge Core processors. The BIS-3922 system’s additional features include a HM77 chipset that supports third-generation Intel Core i3/i5/i7 processors; dual gigabit Ethernet ports; High-Definition Multimedia Interface (HDMI), video graphics array (VGA), and low-voltage differential signaling (LVDS) display interfaces; one mini-PCI Express (PCIe) and one mSATA expansion; and a 3.5” single-board computer (SBC) form factor.
The RIO is an I/O expansion card intended for use with the Raspberry Pi SBC. The card stacks on top of a Raspberry Pi to create a powerful embedded control and navigation computer in a small 20-mm × 65-mm × 85-mm footprint. The RIO is well suited for applications requiring real-world interfacing, such as robotics, industrial and home automation, and data acquisition and control.
The RIO adds 13 inputs that can be configured as digital inputs, 0-to-5-V analog inputs with 12-bit resolution, or pulse inputs capable of pulse width, duty cycle, or frequency capture. Eight digital outputs are provided to drive loads up to 1 A each at up to 24 V.
The RIO includes a 32-bit ARM Cortex M4 microcontroller that processes and buffers the I/O and creates a seamless communication with the Raspberry Pi. The RIO processor can be user-programmed with a simple BASIC-like programming language, enabling it to perform logic, conditioning, and other I/O processing in real time. On the Linux side, RIO comes with drivers and a function library to quickly configure and access the I/O and to exchange data with the Raspberry Pi.
The RIO features several communication interfaces, including an RS-232 serial port to connect to standard serial devices, a TTL serial port to connect to Arduino and other microcontrollers that aren’t equipped with a RS-232 transceiver, and a CAN bus interface.
The RIO is available in two versions. The RIO-BASIC costs $85 and the RIO-AHRS costs $175.
The Aardvark OEM Adapter is based on Total Phase’s Aardvark I2C/SPI USB-to-I2C adapter, which is a flexible tool for system design and testing. The new adapter is available in an I2C or SPI configuration and includes the Total Phase API, which enables you to create custom application GUIs.
The Aardvark OEM Adapter and API are cross-platform compatible with various OSes, including Windows, Linux, and Mac OS X. In a production environment, you can use the API for automated testing or device programming.
Domotics (home automation) control systems are among the most innovative and rewarding design projects creative electrical engineers can undertake. Let’s take a look at an innovative Beagle Board-based control system that enables a user to control lights with a 10.1˝ capacitive touchscreen.
• An I/O board for testing purposes
• An LED strip board for controlling an RGB LED strip
• A relay board for switching 230-VAC devices
• An energy meter for measuring on/off (and also for logging)
ELektor editor and engineer Clemens Valens recently interviewed Koen van Dongen about the design. Van Dongen describes the system’s electronics and then demonstrates how to use the touchscreen to control a light and LED strip.
As Valens explains suggests, it would be a worthwhile endeavor to incorporate a Wi-Fi connection to enable cellphone and tablet control. If you build such system, be sure to share it with our staff. Good luck!
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