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August 08, 2016

LoRaWAN™ is a Low Power Wide Area Network (LPWAN) specification intended for wireless battery operated Things in regional, national or global network. LoRaWAN target key requirements of internet of things such as secure bi-directional communication, mobility and localization services. This standard will provide seamless interoperability among smart Things without the need of complex local installations and gives back the freedom to the user, developer, businesses enabling the roll out of Internet of Things.
LoRaWAN network architecture is typically laid out in a star-of-stars topology in which gateways is a transparent bridge relaying messages between end-devices and a central network server in the backend. Gateways are connected to the network server via standard IP connections while end-devices use single-hop wireless communication to one or many gateways. All end-point communication is generally bi-directional, but also supports operation such as multicast enabling software upgrade over the air or other mass distribution messages to reduce the on air communication time.
Communication between end-devices and gateways is spread out on different frequency channels and data rates. The selection of the data rate is a trade-off between communication range and message duration. Due to the spread spectrum technology, communications with different data rates do not interfere with each other and create a set of "virtual" channels increasing the capacity of the gateway. LoRaWAN data rates range from 0.3 kbps to 50 kbps. To maximize both battery life of the end-devices and overall network capacity, the LoRaWAN network server is managing the data rate and RF output for each end-device individually by means of an adaptive data rate (ADR) scheme.
National wide networks targeting internet of things such as critical infrastructure, confidential personal data or critical functions for the society has a special need for secure communication. This has been solved by several layer of encryption:
•Unique Network key (EUI64) and ensure security on network level
•Unique Application key (EUI64) ensure end to end security on application level
•Device specific key (EUI128)
LoRaWAN has several different classes of end-point devices to address the different needs reflected in the wide range of applications:
•Bi-directional end-devices (Class A)
•Bi-directional end-devices with scheduled receive slots (Class B)
•Bi-directional end-devices with maximal receive slots (Class C)

Penjelasan selengkapnya: http://www.semtech.com/wireless-rf/lora/LoRa-FAQs.pdf

January 13, 2012

Mornsun Power, distributed by DLPC in Australia, has introduced a new AC/DC converter, LD02-10BXX. Featuring compact size, 85-305VAC input voltage and 3000VAC isolation, LD02 is exceptional at EMC performance and meets the IEC61000, UL60950 and IEC60950 standards. It is widely used for industrial, electricity and instruments applications.

Output options of 3.3V, 5V, 9V, 12V, 15V, 24V are available.

1. Wide Input voltage Range: 85~305VAC/120~430VDC
2. AC and DC all in one (input from the same terminal)
3. Low Ripple and Noise
4.EMC meets EN55022、EN55024
5. Compact size,33.7*22.2*18(mm)
6. Low loss, green power
7. High efficiency
8.Over output current protection, short circuit protection
9. Meets IEC61000, UL60950and IEC60950 standards
10. Three years warranty
November 18, 2010
Dino-Lite Digital Microscope

pls feel free to contact us for any enquiries
April 09, 2010
■ 1.71V to 5.5V Operating Range
■ Low Power CapSense® Block
March 25, 2010


The TAS5630DKD2EVM PurePath™ HD customer evaluation module demonstrates the integrated circuit
TAS5630DKD from Texas Instruments (TI).
The TAS5630DKD is a high-performance, integrated Stereo Feedback Analog-Input Digital Amplifier
Power Stage designed to drive 4? speakers at up to 300W per channel. This amplifier requires only a
simple passive demodulation filter to deliver high-quality, high-efficiency audio amplification.
This EVM is configured with 2 BTL channels and the possibility to apply either a single ended or a
differential analog input signal.
The OPA1632 is a High Performance Fully Differential Audio Op Amp designed to allow operation with
single ended or differential input signals to the EVM.
This EVM is a complete stereo analog input 2 × 300 W power amplifier ready for evaluation and great

TAS5630DKD2EVM Features
• Stereo PurePath™ HD evaluation module.
• Self-contained protection system (short circuit and thermal).
• Standard 1VRMS single ended line input or differential input.
• Double-sided, plated-through PCB layout.

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