Monthly Archives: December 2015

IEEE 802.15.4 Wireless Microcontroller

IEEE 802.15.4 specifies standards for the physical layer and media access control. These were developed for low-data-rate monitor and control applications and extended-life low-power-consumption uses. ZigBee, WirelessHART, MiWi, and Thread specifications are based on 802.15.4, but these applications further develop the upper layers.

The JN5161 is an ultra low power, high performance microcontroller that supports either RF4CE or IEEE 802.15.4 for development of remote/wireless sensor applications. It features an enhanced 32-bit RISC processor with 64 kB embedded Flash, 8 kB RAM and 4 kB EEPROM memory and also has peripherals with a wide range of applications including I2C, SPI, and a four channel ADC.

Block DIagram

Block DIagram

Where Used?

  • Robust and secure low power wireless applications
  • RF4CE Remote Controls
  • JenNet-IP networks
  • ZigBee SE networks
  • ZigBee Light Link networks
  • Lighting & Home automation
  • Toys and gaming peripherals

Why Used?

  • Single chip device to run stack and application
  • Very low current solution for long battery life – over 10 years
  • Supports multiple network stacks
  • Highly featured 32-bit RISC CPU for high performance and low power
  • System BOM is low in component count and cost
  • Flexible sensor interfacing options

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Mini or Micro-USB Interface IC

USBs are just about everywhere. They are multi purpose, multi platform, and just about any device nowadays have a means to connect via USB, so adding one to your project is never a bad idea. NXP’s MC34827 is a dedicated IC for managing charging and signal multiplexing through mini or micro-usb connector. The IC is able to automatically identify the type of power source and select the appropriate current level according to the type of battery attached.

Aside from managing the power source, the IC is also able to multiplex the 5pins to support UART and High Speed USB 2.0, mono/stereo-audio/microphone headset with or without a cord remote control. To do this, the 34287 supports various detection mechanisms, including the VBUS detection and ID detection.

Mini or Micro-USB Interface IC

Mini or Micro-USB Interface IC

Where Used?

  • Cell phones
  • MP3/MP4 players
  • Portable voice recorders
  • USB universal charging solution (UCS-OMTP)
  • Supports mini/micro – USB connector
  • UART and USB high speed communication
  • Remote control/accessories IDs

Why Used?

  • Supports USB or UART test and R/D cables
  • High speed USB2.0 compliant
  • Supports 32 ID resistance values with a high-accuracy 5-bit ADC
  • I2C interface with interrupt to the host
  • 10 μA quiescent current in Standby mode

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LIN 2.1 / SAEJ2602-2 Dual LIN Physical Layer

Local Interconnect Network (LIN) is a serial network protocol that is used for communication between parts inside a vehicle. Can was seen as a bit too expensive, while looking for a cheaper alternative the LIN was born via the LIN Consortium. LIN enables cost-effective communication with sensors and actuators, being the lowest level of hierarchical network. The features of CAN are no longer required.

MC33663 integrates two physical layer LIN bus dedicated to automotive LIN sub-bus applications. Its is compatible with LIN protocol specifications 2.1 and SAEJ2602-2 while maintaining high immunity against electromagnetic interference. The MC33663 is compatible with both 5.0 and 3.3 V digital inputs with no external components required.

MC33663 Internal Block Diagram

MC33663 Internal Block Diagram

Where Used?

  • Automotive LIN sub-bus applications

Why Used?

  • Low standby current in sleep mode
  • Over-temperature protection
  • Permanent dominant state detection
  • Fast baud rate mode selection reported by RXD
  • Sustains ±15.0 kV ESD IEC6100-4-2 on LIN BUS and VSUP pins

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Enhanced Performance HDMI/DVI Level Shifter

The PTN3381DBS is an HDMI/DVI Level Shifter with a great array of features such as voltage regulation, dongle detection and support for 3Gbps operation. The PTN3381DBS is capable of High speed TMDS level shifting, converting four lanes of low swing AC-coupled differential input signals to DVI and HDMI compliant output signals. It also has integrated DDC buffering and level shifting with an I2C-bus clock frequency of of 100kHz.

The PTN3381DBS is also equipped with HDMI dongle detect that incorporates I2C slave ROM. With its HDMI support, the device generates 5V for the DVI/HDMI connector from the 3.3V DP_PWR supplied by the DisplayPort Connector.

Enhanced performance HDMI/DVI level shifter

Enhanced performance HDMI/DVI level shifter

 

Where Used?

  • DisplayPort to HDMI adapters supporting 36-bit deep color, 3D and 3 Gbit/s modes
  • DisplayPort to DVI adapters required to drive long cables

Why Used?

  • TMDS level shifting operation up to 3 Gbit/s per lane (300 MHz character clock) supporting 36-bit deep color, 3D and 3 Gbit/s modes
  • Programmable equalizer
  • Rise time accelerator on sink-side DDC ports
  • Back-power safe sink-side terminals
  • Responds to DDC read to address 81h
  • Power-saving modes

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