December 2014

December 2014
New contactless position sensor from ams provides reliable, software-compatible replacement for rotary encoders

AS5601 is optimized for use in rotary knobs, and provides an innovative push-button function

The new AS5601 contactless rotary position sensor from ams AG (SIX: AMS), a leading provider of high performance analog ICs and sensors, gives designers an extremely reliable replacement for conventional rotary encoders, while providing a software-compatible incremental quadrature output.

In devices which use rotary knobs, the AS5601 and its paired magnet may replace a rotary encoder without any change to the host microcontroller or its application software.

The AS5601 is based on ams’ proven patented magnetic Hall position-sensing technology, which is already widely used in the automotive, industrial, medical and consumer markets. Since the AS5601 performs contactless rotary position measurement, it suffers none of the reliability problems with which conventional rotary encoders are plagued. They are notoriously prone to interference and premature failure because of the effects of mechanical wear and contamination by dust, grease, dirt and humidity.

The robust differential sensing circuit in the AS5601 also rejects interference from external magnetic stray fields.

The AS5601’s operation, including its zero position, provides for easy configuration, since its register settings are accessed via an I2C interface and are saved in on-chip OTP memory.

In addition, the quadrature (A/B) output offers great flexibility, providing between 8 and 2048 positions. This means that the AS5601 may be used, for instance by off-the-shelf rotary knob or encoder manufacturers, in multiple end products with different output requirements. Users of the AS5601 also have the choice of a 12-bit digital output, suitable for designs that are not directly replacing a conventional rotary encoder.

As well as measuring angular displacement, the AS5601 can detect button presses. Algorithms implemented in the AS5601 reliably detect a sudden significant reduction in the air gap between the IC and its paired magnet, generating a PUSH output signal. This push-button function is immune to variations in magnetic field strength due to temperature variations or ageing.

By default, the AS5601 automatically enters one of three low-power modes, keeping power consumption to a minimum by reducing the scanning frequency when the device has been inactive for a defined interval. In the lowest-power mode, the AS5601 draws just 1.5mA.

‘The clever design of the AS5601’s signal-processing circuitry allows for the provision of a simple quadrature output with which every rotary encoder user will be familiar. This means that solid-state rotary measurement technology is for the first time able to replace unreliable rotary encoders without any need for new software programming in existing designs,’ said Heinz Oyrer, senior manager for global marketing in the position sensing business line of ams.

Click for further information on the AS5601 and to request samples.

 
Silicon Labs Expands Sub-GHz Wireless Portfolio to Support 802.15.4/4g Connectivity

Next-Generation EZRadio® and EZRadioPRO® RF ICs Offer Highest Performance and Lowest Power for Emerging and Proprietary Protocols

Silicon Labs, a leading provider of wireless connectivity solutions for the Internet of Things, today introduced next-generation EZRadio® and EZRadioPRO® wireless ICs offering industry-leading power efficiency, wireless range and flexibility. Operating in the sub-GHz band, the new Si4x55 EZRadio and Si4x6x EZRadioPRO families support a variety of proprietary, legacy and emerging protocols including IEEE 802.15.4/4g, Wireless M-Bus and Wi-SUN. The EZRadio and EZRadioPRO families provide a versatile, high-performance multiprotocol wireless connectivity platform for a wide array of IoT applications including wireless sensor networks, industrial M2M communication, remote controls, security systems and smart meters.

Silicon Labs’ new EZRadio and EZRadioPRO families offer the highest levels of RF performance and single-chip integration in the sub-GHz wireless IC market. These sub-GHz wireless ICs provide best-in-class performance specifications including transmit output power (up to +20 dBm for EZRadioPRO), sensitivity (-116 dBm for EZRadio and -133 dBm for EZRadioPRO) and link budget (153 dB).

Ideally suited for battery-powered wireless applications, the EZRadio and EZRadioPRO devices provide the industry’s lowest standby current of 40 nA with memory retention, consuming up to 75 percent less sleep mode current than competing solutions. Each device includes a patent-pending signal arrival detector that reduces the average receiver current by detecting a signal faster than traditional sub-GHz receivers, effectively increasing the battery life for various applications. Featuring a high-efficiency integrated power amplifier (PA) consuming only 18 mA at 10 dBm, these energy-friendly sub-GHz radios can operate on a single coin cell battery, and they are well suited for smart meter designs that require long-range and up to 20-year battery lifetime. Autonomous duty cycling between active and low-power modes and advanced features such as frequency hopping and antenna diversity minimize host MCU interaction and further reduce overall system power consumption.

Silicon Labs’ sub-GHz radios support a wide variety of proprietary protocols through flexible on-chip packet handler and modem technology. EZRadio devices handle most basic packet formats, while EZRadioPRO devices are designed for more complex packet formats. The flexible architecture offloads the host microcontroller (MCU) without sacrificing RF performance. EZRadio and EZRadioPRO devices can support a protocol stack such as an 802.15.4-based mesh network or a point-to-point or star network in conjunction with a Silicon Labs 8-bit MCU or a 32-bit EFM32® Gecko MCU serving as the external host.

Si4x55 EZRadio transceivers, transmitters and receivers provide cost-effective, easy-to-use wireless connectivity solutions for basic “push-button” applications such as remote controls for set-top boxes, bidirectional key fobs and garage door openers. Configurations include simple point-to-point or star networks with standard packet formats. Covering the 283-525 MHz and 850-960 MHz frequency bands, EZRadio devices provide excellent communication range for indoor applications, industry-leading power efficiency, superior blocking and phase noise performance. Available in the smallest package size in the sub-GHz market (3 mm x 3 mm), EZRadio devices are suitable for any space-constrained wireless design.

Si4x6x EZRadioPRO transceivers, transmitters and receivers are an excellent choice for developers requiring advanced features, higher RF performance and a wider range of protocol options. They are ideal for ultra-long-range, narrowband applications using complex, advanced packet formats and network protocols. The devices are designed to meet stringent regulatory and standards compliance requirements including FCC part 90 Mask D, ETSI Category-I, ARIB T108, Wireless M-Bus and IEEE 802.15.4/4g options. The Si4461 EZRadioPRO transceiver recently received Wi-SUN certification from a leading sub-GHz wireless module partner in Japan, highlighting compliance with IEEE 802.15.4g.

While many high-performance RF ICs can be difficult to configure, Silicon Labs has simplified sub-GHz wireless design with its easy-to-use, GUI-based Wireless Development Suite (WDS). Available at no charge from Silicon Labs’ website, WDS software eliminates the complex manual configuration process needed for most RF designs, saving time and effort often required to calculate and verify radio parameters. Developers simply select from predefined, optimized example code, or they can easily set up their own customized configurations.

www.silabs.com/wireless

 
MPM3684

18V 15A Step-Down Power Module in 12x15x4mm QFN

Features
• Complete 15A/20A DC-to-DC Solution
• Wide Input Voltage Range from 2.5V: -- 2.5V to 18V with External 5V Bias -- 4.5V to 18V with Internal Bias
• 1% Reference Voltage Over 0˚C to 70˚C Junction Temperature Range
• Ultrafast Transient Response (COT Control)
• Programmable Switching Frequency from 200KHz to 1MHz
• Support Pre-Bias Start Up
• Programmable Soft-Start Time with Default 3ms
• Non-latch OCP, OVP, UVP and Thermal Shutdown
• Output Adjustable from 0.65V to 5V
• Support All MLCC Output Capacitor
• QFN Package in 15 x 12 x 4 (mm)

Benefits
• Minimal external components – Easy to Use
• COT control– Fast transient response
• Low Iq – High light load efficiency, low standby power
• Small solution – Ideal for compact designs

www.monolithicpower.com

 
Seoul Semiconductor

The new ZC series Chip-On-Board (COB) LED Arrays offer high lumen density and efficacies of upto 140lm/W in a single, easy-to-use LED component family. Available in all major color temperatures from 2700 K up to 6000 K, these high flux packages deliver system level performance of 700 lumens to over 6,000 lumens. The new ZC series family is available in a single 3-step MacAdam binning, ensuring excellent color consistency with minimum CRI options of 70, and 80 combining high quality of light with high efficacy.

Click for more info.

 
Thank you!

We would like to express our sincere thanks to all our customers for your valued business and support throughout the year, and hope to continue our business relationships in 2015.

We will be closing for the holiday break from Friday 12th December 2014 and will be back in the office on Monday 5th January 2015.

Merry Christmas and a Happy New Year to you!
Staff & Management of NuVision Electronics