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RS Components offers humidity and temperature sensor from Sensirion

Fri, Apr 05, 2019

Equipped with a membrane to protect against water and dust, Sensiron’s SHT85 temperature and humidity sensor is available from RS Components.

It has a pin-type connector for easy integration and replacement and offers thermal coupling to its surrounding environment as well as decoupling from potential heat sources on the main processing board.

It meets IP67 rating and can operate in harsh environments. The membrane protects the sensor opening from water and dust with the response time of the relative humidity (RH) signal unaffected.

The SHT85 offers a calibrated, linearised and temperature-compensated digital output. It also has final product level testing to deliver a typical accuracy of ±1.5 per cent (RH) and ±0.1 degree C, an I²C interface with communication speeds up to 1MHz, fast start-up and measurement time, low signal noise and an operating voltage from 2.15 up to 5.5V.

The Sensirion SHT85 humidity and temperature sensor is now shipping from RS in the EMEA and Asia Pacific regions.

RS Components is a trading brand of Electrocomponents, a multi-channel provider of industrial and electronic products. It offers more than 500,000 industrial and electronics products, sourced from over 2,500 leading suppliers, and provides value-added services to over one million customers, shipping more than 50,000 parcels a day from operations in 32 countries.

https://uk.rs-online.com

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Integrated RF modules create 6LoWPAN sub-GHz mesh

Fri, Apr 05, 2019

A wireless IP mesh based on fully integrated RF modules has been created by Radiocrafts.

A new family of RF modules form a complete wireless IP mesh for long range IoT access. The RIIM (Radiocrafts Industrial IP Mesh) uses 6LoWPAN, a lightweight version of IPv6.  This allows the user to access each sensor and controller from the internet using IP addressing. The radio protocol uses IEEE 802.15.4 g/e providing bi-directional communications with short transmission pulses that enables dense networks with high reliability and very low power consumption.

RIMM will enable customers to get to market quickly, based on Radiocrafts’ compact RF module as the foundation, simple set-up and a novel way to interface any sensor or actuator, the Intelligent C-programmable I/O (CIO). Customers can create complex applications managing and interfacing sensors and actuators in less than 100 lines of C-code, removing the need for an external microcontroller in the devices, advises Radiocrafts.

A complete RIIoT network includes sensor nodes based on the RC1882CEF-IPM module. The module can be configured as any of the required network nodes, a border router, a mesh router or a leaf node.

The Wireless IP Mesh does not require any license or subscription, and is very low power.

It operates at 868 or 915MHz frequency and is based on a mesh network topology, using IPv6 to address each leaf node. It can support several hundred nodes in a network, reveals Radiocrafts, yet has very low power consumption; it offers a five-year lifetime on a 2000mAh coin cell battery.

The universal sensor/actuator ICI interface means that no external microcontroller is required.

The network range is up to 20km and up to 29 mesh hops can be supported.

Ethernet access to the RIIM network is via the Radiocrafts border router. The network is cloud-compatible via the CBOR protocol.

http://www.radiocrafts.com

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PoE chipset exploits IEEE 802.3bt specificiation

Thu, Apr 04, 2019

Reliable and space-efficient powered devices (PDs) can be built to take advantage of the latest IEEE 802.3bt Power-over-Ethernet (PoE) specification, says STMicroelectonics, on the introduction of the PM8804 and PM8805.

The PM8804 and PM8805 provide the PoE-converter circuitry for PDs up to class-eight, which defines a usable power budget of 71W. According to STMicroelectronics, the chipset saves space, enhances reliability, and cuts time to market for 5G small cells, WLAN access points, switches, and routers. The PoE chipset also targets smart-building and smart office applications such as IP cameras, access-control systems, display panels, lighting, curtain or shutter controllers, video-call systems, IP phones, and tabletop consoles.

The PM8804 implements a PWM controller for a 48V isolated flyback or forward converter, including dual low-side gate drivers for high-efficiency forward active-clamp topologies. The operating frequency is selectable up to 1MHz, allowing the use of small external filter and decoupling components for high power density. The PM8804 is a high-voltage start-up regulator with 20mA output capability to help save on board space and bill of materials.

The PM8805 companion chip contains two active bridges, a charge pump for driving high-side MOSFETs, a hot-swap FET, and the IEEE 802.3bt compliant interface. Integrating the active bridges saves the real estate otherwise occupied by eight discrete MOSFETs and their driving circuitry, explains STMicroelectronics. The PM8805 generates a power-good signal for enabling the PM8804 and other circuitry such as an LED driver, and supports maintain power signature (MPS) current control that allows the PD to enter power-saving standby without being disconnected.

Both devices are in production now. The PM8804 is packaged as a 3.0 x 3.0mm, 0.5mm-pitch VFQFPN-16. The PM8805 in 8.0 x 8.0mm thermally enhanced VFQFPN-43 featuring exposed pads.

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http://www.st.com

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10V GaN FETs are enhanced for DC/DC conversion

Thu, Apr 04, 2019

A fourth eGaN FET joins the range available from Efficient Power Conversion (EPC). The 100V, 3.8 mOhm EPC2053 eGaN FET, joins the EPC2045, EPC2052, and EPC2051. EPC says that its 100V family of GaN transistors are more efficient, smaller, and lower cost for high performance 48V DC/DC conversion.

The EPC2045 (7 mOhm, 100V), EPC2052 (13.5 mOhm, 100V) and EPC2051 (25 mOhm, 100V) FETs are suitable for a range of power levels and price points to meet the increasing demands of 48V server, 48V automotive, and 54V data centre applications. Other applications for the 100V family include single-stage 48V to load open rack server architectures, USB-C, precision motor drives, LED lighting, and lidar, says EPC.

Performance advantages gained from GaN in 48V IN conversion can be exploited in artificial intelligence (AI), cloud computing, and advanced high-performance motor drives. Automotive systems are also moving from 12V distribution systems to 48V systems to support the emergence of autonomous vehicles with lidar, radar, camera, and ultrasonic sensors. “Our new family of 100V products demonstrate that in all 48V topologies, the highest efficiency and lowest cost is achieved with GaN FETs and ICs,” said Alex Lidow, co-founder and CEO at EPC.

In all the topologies with 48 VIN, the highest efficiency is obtained using GaN devices due to their lower capacitance and smaller size, claims EPC. Recent price drops in GaN power transistors mean that cost comparison with equivalent silicon-based converters favours the use of GaN devices, according to the company.

Achieving as high as 97 per cent efficiency, the 100V eGaN FETs can be evaluated using two new reference designs and five demonstration boards available from EPC.

The EPC9138 demonstration board is a 400kHz switching frequency, 48V IN, 15A output current, buck converter featuring the 100V EPC2053. The EPC9141 demonstration board is a 400kHz switching frequency, 48V IN, 10A output current, buck converter featuring the 100V EPC2045.

Standard half-bridge development boards are also available to support in-circuit performance evaluation of each of the 100V family devices. The EPC9093 supports the EPC2053, the EPC9078 and EPC9205 support the EPC2045, the EPC9092 supports the EPC2052 and the EPC9091 supports the EPC2051.

http://www.epc-co.com

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