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7 Oct 2014


Printby linear.com:

The LTC2946 is a high or low side charge, power and energy monitor for DC supply rails in the 0V to 100V range. An integrated ±0.4% accurate, 12-bit ADC and external precision time base (crystal or clock) enables measurement accuracy better than ±0.6% for current and charge, and ±1% for power and energy. A ±5% accurate internal time base substitutes in the absence of an external one. All digital readings, including minimums and maximums of voltage, current and power, are stored in registers accessible by an I²C/SMBus interface. The part’s wide operating range makes it ideal for monitoring board energy consumption in blade servers, telecom, solar and industrial equipment, and advanced mezzanine cards (AMC).

LTC2946 – Wide Range I2C Power, Charge and Energy Monitor - [Link]

30 Sep 2014

The MAX5825PMB1 peripheral module provides the necessary hardware to interface the MAX5825 8-channel DAC to any system that utilizes Pmod™-compatible expansion ports configurable for I²C communication. The IC features eight independent 12-bit accurate internally buffered voltage-output DAC channels. The IC also features an internal reference that is selectable between 2.048V, 2.500V, and 4.096V (4.096V reference operation is not supported with a standard 3.3V Pmod-port power supply).

MAX5825PMB1 Peripheral Module Board - [Link]

19 Jul 2014



by berryjam.eu:

Main task – advanced communication between multiple Arduinos using I2C bus.

Main problem – most online tutorials covers just one blinking LED with almost no practical use. Slave just executes ONE and SAME function every time Master asks about it. I’d like to outsource slave Arduinos for zillions of tasks.

Proposed solution – simple protocol which enables to send any number of commands to Slave, opposing single return from simple Wire.onRequest();

Simple I2C protocol for advanced communication between Arduinos - [Link]

19 Jun 2014


blog.atx.name writes:

Some time ago, I stumbled upon an article about 25¢ I²C adapter. I usually use my Raspberry Pi to interface with I²C devices, but having it right on my notebook seemed like quite useful thing, so I decided to build a project around it. Altough the mentioned article says that I²C is not supported on Intel cards on Linux (all of this was tested on Dell Latitude E5530 which does have Intel HD4000), I decided to try anyway. A lot has probably changed since 2008 when it was written.

TWILight – VGA I²C breakout board - [Link]

3 May 2014

by bajdi.com:

I’ve been looking for ways to control my Service droid robot, my Service droid robot has an ATmega2560 (with Arduino bootloader) and a Raspberry Pi. My goal is to control it over wifi. But I wanted to start with some more simpler things first. I’ve recently found some python code on letsmakerobots.com that lets me sent data over I2C from a Raspberry Pi to a micro controller.

Before getting this to work you need to configure I2C on the Raspberry Pi. Adafruit has written a nice guide how to do this. I also installed the python-SMBus package: sudo apt-get install python-smbus.

Controlling an Arduino through a Rapsberry Pi webserver - [Link]

2 May 2014

Digispark Pro – The tiny Arduino IDE ready, usb and mobile dev board and ecosystem – cheap enough to leave in any project! Wi-fi, BLE, and 25+ shields!

Serial over USB debugging, USB programmable, 14 i/o, SPI, I2C, UART, USB Device Emulation, Mobile Development Ready, Optional BT, BLE, Mesh, and Wi-Fi.

The super small, dirt cheap, always open source, Arduino compatible, USB (and Mobile and Wireless!) development (and production) platform, and follow-up to the original Digispark.

Easier to use, more pins, more program space, more features, more reliable – supporting the entire existing Digispark ecosystem of 25+ shields and adding Wi-Fi, Bluetooth, BLE shields and more! Ready for all your projects – including mobile hardware development! All still super affordable!

The Digispark Pro Ecosystem is the cheapest, Arduino compatible development platform for Mobile and Wireless hardware development.

Digispark Pro – tiny, Arduino ready, mobile & usb dev board! - [Link]

1 May 2014

Inter-Integrated Circuit or I²C is a multimaster serial single-ended computer bus invented by Philips Semiconductor Division, today NXP Semiconductors. This technology is used in attaching low-speed peripherals to a motherboard, embedded system, mobile phones, or other digital electronic devices.

One family of devices under I2C is the Philips Semiconductors Gunning Transceiver Logic Translator Voltage Clamp (GTL-TVC), a family of bi-directional low-voltage translators, is designed in a BiCMOS process for protecting the sensitive I/Os on new advanced sub micron components. The GTL-TVC devices offer protection from over -voltage and electrostatic discharge applied by older legacy devices and translate the VIH and VOH switching levels.The GTL-TVC devices can also be used to interface between devices I/O’s operating at different voltage levels.

This circuit uses the GTL2010PW 10-bit bidirectional low-voltage translator which provides high-speed voltage translation with low ON-state resistance and minimal propagation delay. The device allows bidirectional voltage translations between 1.0 V and 5.0 V without use of a direction pin. This allows the use of different bus voltages on each source to drain channel so that a 1.5 V device can communicate with 2.5 V, 3.3 V or 5V devices without any additional protection. The circuit shows how the GTL2010 can be used in an application where two ASIC’s I2C ports (left side) operating at 1.5 V can interface to higher voltage devices (right side) operating at 3.3V and 5.0 V. One of the ASIC ports (MDDC on S1 & S2) only needs to interface with 5V I2C devices. The other ASIC port (MI2C on S3 & S4 and S5 & S6) needs to interface with both 3.3 V SMBus and 5.0 V I2C devices.


  • GTL2010PW 10-bit bidirectional low-voltage translator
  • 1KΩ General Purpose Resistors – 2 Units
  • 2.2KΩ General Purpose Resistors – 4 Units
  • 200KΩ General Purpose Resistor

1.5V I2C Bus to 3.3V SMBus and 5.0V I2C Bus - [Link]

25 Apr 2014


Raj @ embedded-lab.com

I2C or IIC (Inter-Integrated Circuit) is a simple bidirectional serial interface, which requires only 2 signal lines for data transfer. It was originally developed by Philips in 1980′s to provide easy on-board communications between a CPU and various peripheral chips in a TV set. Today, it is widely used in varieties of embedded systems to connect many low speed peripherals, such as external EEPROMs, sensors, LCD drivers, port expanders, real-time clocks, etc, to the host microcontroller. In this tutorial, we will explore the chipKIT Wire Library for establishing an I2C communication link between the chipKIT Uno32 board and two I2C sensors. The Uno32 board receives the sensor outputs through the I2C link and displays the results on the serial monitor window on the computer screen.

chipKIT Tutorial 6: Inter-Integrated Circuit (I2C) communication - [Link]

10 Apr 2014


The MAX31629 I2C digital thermometer and real-time clock (RTC) integrates the critical functions of a real-time clock and a temperature monitor in a small-outline 8-pin TDFN package. Communication to the device is accomplished through an I2C interface. The wide power-supply range and minimal power requirement of the device allow for accurate time/temperature measurements in battery-powered applications. The digital thermometer provides 9-bit to 12-bit temperature readings that indicate the temperature of the device.

MAX31629 – I2C Digital Thermometer and Real-Time Clock - [Link]

2 Apr 2014

The PCA9508 is a CMOS integrated circuit that supports hot-swap with zero offset and provides level shifting between low voltage (down to 0.9 V) and higher voltage (2.7 V to 5.5 V) for I2C-bus or SMBus applications. While retaining all the operating modes and features of the I2C-bus system during the level shifts, it also permits extension of the I2C-bus by providing bidirectional buffering for both the data (SDA) and the clock (SCL) lines, thus enabling two buses of 400 pF. Using the PCA9508 enables the system designer to isolate two halves of a bus for both voltage and capacitance, and perform hot-swap and voltage level translation. Furthermore, the dual supply pins can be powered up in any sequence; when any of the supply pins are unpowered, the 5 V tolerant I/O are high-impedance.

PCA9508 has B-side and A-side bus drivers. The 2.7 V to 5.5 V bus B-side drivers behave much like the drivers on the PCA9515A device, while the adjustable voltage bus A side drivers drive more current and incur no static offset voltage. This results in a LOW on the B-side translating into a nearly 0 V LOW on the A side.

The hot swap feature allows an I/O card to be inserted into a live backplane without corrupting the data and clock buses. Control circuitry prevents the backplane from being connected to the card until a stop command or bus idle occurs on the backplane without bus contention on the card. Zero offset output voltage allows multiple PCA9508s to be put in series and still maintains an excellent noise margin.


  • PCA9508D CMOS integrated circuit (3 units)
  • BUS Master
  • Slave 400kHz (3 units)
  • 10kΩ Resistor (6 units)
  • Ground Source

Hot swap level translating I2C repeater - [Link]





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