2 protocol and RMC simple signaling for BBS controls. ) -40 °C to +125 °C Temp sensor I2C address of 0011A2A1A0 and EEPROM I2C address of , temperature range from ­40 °C to +125 °C 0. Normally devices, both masters and slaves, are freely interchangeable between both buses. Trackbacks/Pingbacks. c, line 128 (as a function); drivers/i2c/i2c-core-smbus. Typical voltages used are +5 V or +3. An errata sheet, describing minor operational differences from the data sheet and recommended workarounds, may exist for cur-rent devices. Judging from my emails, it is quite clear that the I2C bus can be very confusing for the newcomer. ALERT* (Output) PMBus SMBALERT* signal Active Low, referenced to SIG RTN. By interfacing the DBQ to the system's I2C bus, a systems engineer can monitor critical system level performance requirements that include Vin, Iin, Vout, Iout, and operating temperature. PMBus commands support power supply sequencing, precision point-of-load voltage adjustmentand margining. gz /usr/share/doc/linux-headers-4. These devices allow designers to monitor various system rails, adjust timing delays during system turn on and turn off, improve system reliability, and assist in. I2C/SMBus/PMBus TIMING REQUIREMENTS TA = -40°C to 85°C, 3 V Some systems may plug in either version 1 or version 2 of the IBM common > form factor power supply. Page 1 of 8 LINEAR TECHNOLOGY CONFIDENTIAL 3/30/09 Not for distribution outside of LTC I²C / SMBUS PMBUS QUICK REFERENCE GUIDE REV. Use the devicetree binding to differentiate between the version the driver should use. SMBus Quick Start Guide, Rev. This flexible and highly versatile standard allows for communication between devices based on both analog and digital technologies, and provides true interoperability, which will reduce design complexity and shorten time to market for power system designers. 8-Channel PMBus Power System Manager Featuring Accurate Output Voltage Measurement The LTC®2978A is an 8-channel Power System Manager used to sequence, trim (servo), margin, supervise, man-age faults, provide telemetry and create fault logs. 이번 시간에는 i2c 의 정의와 기본 동작 방식에 대해 알아보고 다음 강좌에서 실제로 사용하는 방법을 설명할 예정이다. I2C is also used extensively in platform based. If you get a warning about I2C_SLAVE not being defined, you may need to include both and (The location has changed in newer kernels vs. The following tables summarize the differences between the two buses. 050" ribbon cable is used and the connectors can be daisy chained on the wire. The PMBus interface facilitates power management features not previously available in an isolated, modular, 1/4 brick DC/DC converter. I2C is a simple two-line, synchronous serial communication bus originally designed to allow communication between two or more integrated circuits that are in close proximity to each other. SMBus Quick Start Guide, Rev. After device reset, the weak pullup is removed and the pin is configured as an input or output. 5V to 18V input, 4A/4A/2A/2A synchronous quad converter with PMBus/I2C Interface 48-VQFN -40℃ to 125℃ The TPS65400-Q1 is an integrated PMU optimized for applications requiring small form factor and high power conversion efficiency, enabling small space-constrained equipment with high ambient operating temperature without cooling. I am a beginner with PMBus. Test case for spikes. Using the I2C Bus. It adds timeouts and standards for data transfer formats, however, it does not define the content of transmitted data. 0 kernel - modules - modprobe-config. What I'm looking to do is establish communication with the chip and verify the communication with the Beagle TM I2C/SPI Protocol Analyzer. AD7991 Quad Input ADC. These include atmospheric sensors, EEPROMS, and several types of display. In general, I2C, SMBus and PMBus devices can share a bus without any major issues. I2C is a protocol for communication between devices. Sep 10, 2014 · 1、i2c初始化问题; 2、i2c挂死问题、挂死机制的判断以及复位; 3、i2c多节点网络低电平抬升问题; 4、i2c热插拔以及隔离,ltc4300应用等; 5、i2c二选一开关器件的应用,pca9541应用等; 6、i2c信号质量和时序的测试要求的标准;. The theoretical difference is that PMBus is a superset of SMBus which is a superset of I2C. In general, I. Normally devices, both masters and slaves, are freely interchangeable between both buses. h, line 143 (as. EVKT-USBI2C-02 provides the communication interface for USB to I2C or USB to PMBus. 0-1017-gcp/copyright /usr. System designs using SMBus or I2C will have a host controller to 'master' the bus. 0, only seven bit addressing is used. Trivial conflict in fs/eventpoll. This way it is possible to have on the same I2C bus more than one I2C device with the same fixed part of I2C address. PMBus commands support power supply sequencing, precision point-of-load voltage adjustmentand margining. After the initial programming of all PMBus voltage regulators, the UltraZed-EG SOM can drive the PMBus (via channel 1 of the I2C switch/mux and P5 port of the I2C 8bit I/O expander) in - order to control/monitor the PMBus voltage regulators on the UltraZed- EG SOM for the purpose of power management and/or measurements. I have a interrupt driven interface for handling how the I2C uses the H/W driver to receive and transmit bytes onto and off of a buffer, essentially serialising the data. PMBus commands support power supply sequencing, precision. Some unofficial SPI variants only need 3 wires, that is a SCLK, SS and a bi-directional MISO/MOSI line. CRC-8 Calculator The following Java™ 1. Solved: Hi, I have a design where I read out the temperature of an FPGA (VU7P) via the SMBUS/I2C interface and via an AXI C2C connection. Signal latches until cleared. Jun 26, 2017 · The System Management Bus (SMBus) and Power Management Bus (PMBus) Slave PSoC Creator Component provides a simple way to add an I2C physical layer interface to a PSoC 3 or PSoC 5LP design with either SMBus or PMBus protocol running on top of it. Writing and reading to registers require a specific way to do that, it is not like the normal I2C sensors (I think). We see what's involved in using I2C on the Raspberry Pi for inter-device communications. Summary of the changes and new features merged in the Linux kernel during the 4. The current PMBus specification allows upto 400 kHz operation similar to fast I2C mode. I2C, USART and timers • 4x peripherals communication interface • 1x USART, 1x LPUART (low power) • 1x SPI 16 Mbit/s • 1x I2C (SMBus/PMBus) • 7x timers: 1x 16-bit with up to 4 channels, 1x 16-bit with up to 2 channels, 1x 16-bit ultra-low-power timer, 1x SysTick, 1x RTC and 2x watchdogs (independent/window). I2C, USART, Timers • 5x peripherals communication interface • 1x USART (ISO 7816, IrDA), 1x UART (low power) • Up to 2 SPI interfaces, up to 16 Mbits/s • 1x I2C (SMBus/PMBus) • 8x timers: 1x 16-bit with up to 4 channels, 2x 16-bit with up to 2 channels, 1x 16-bit ultra-low-power timer, 1x SysTick, 1x RTC and 2x watchdogs (independent. CRC-8 Calculator The following Java™ 1. There are more than 50 members in the PMBus organization. The I²C reference design has a 7-bit address space, with a rarely-used 10-bit extension. I'm not sure if that will work for the PMBus. ABSTRACT Power Management Bus (PMBus) is a free and open standard communications protocol for power management devices. 1、i2c初始化问题; 2、i2c挂死问题、挂死机制的判断以及复位; 3、i2c多节点网络低电平抬升问题; 4、i2c热插拔以及隔离,ltc4300应用等; 5、i2c二选一开关器件的应用,pca9541应用等; 6、i2c信号质量和时序的测试要求的标准;. I2C Framework: C++. PMBus dictates a maximum bus speed of 400kHz and has built-in timeouts important for critical systems. 00 Page 1 of 24 Feb 1, 2016 AN1955 Rev 1. I have included pullup resistors and am using a i2c logic converter for added safety. Special thanks go to elmor for helping with the IR3567B PMBus commands. 65V to 5V SPI to 24MHz, I2C/SMBus to 1. Xander is correct, and in fact, PMBus, a specification for power supply management over I2C, specifically avoids the term "register" in favor of "command" to avoid just this kind of confusion. RX 480 + IR3567B specific support. Sam Davis Besides the I2C interface, select PMBus commands for the ISL8601 can also be programmed via external resistors, bringing the power and. Summary of the changes and new features merged in the Linux kernel during the 4. PMBus extends SMBus by defining a set of device commands specifically designed to manage power converters, exposing device attributes such as measured voltage, current, temperature and more. Path /lib/modules/4. The PMBus is derived from the System Management Bus (SMBus) Specification Version 1. Contribute to aristanetworks/sonic development by creating an account on GitHub. I have included pullup resistors and am using a i2c logic converter for added safety. 5 V (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT. Customers are now able to configure power supplies with up to 4,920 watts output capability, and to monitor and control many attributes of the power supply via an I2C interface. An errata sheet, describing minor operational differences from the data sheet and recommended workarounds, may exist for cur-rent devices. Downgrading from Win 8 and making I2C touchpad work with Windows 7 ‎01-21-2015 10:17 AM I have downgraded Lenovo Yoga 3 Pro-1370 to Windows 7-64 and its touchpad (Synaptics) is not detected by Windows at all (and not shown in Device Manager). c, line 138 (as a variable); include/linux/i2c. I’m using the Aardvark TM I2C/SPI Host Adapter to communicate with a SMBus slave device (Accuron PS401). Devices in our large portfolio of easy-to-use buck, boost, flyback, forward and push-pull DC-DC controllers are excellent options for implementing many telemetry and control features via PMBus™ or an I2C interface, such as current limits, temperature, output current, output voltage, switching frequency, power good, soft start and more. 04 Raring and 13. I2C is a two-wire communications bus/protocol developed by Philips. 0 real-time power, voltage, current, temperature, and Compliant Command Structure fault data to the system management host through the I2C / SMBus interface. There is a lot of serial communication protocol but in which I2C and SPI are very famous, In this article, I will discuss the difference between I2C and SPI ( I2C vs SPI ). Signal latches until cleared. , Electronics & Electrical Communications Department, PEC University of Technology, India Abstract—A number of field buses are available to exchange the. Design Ideas for Intersil Digital Power Monitors APPLICATION NOTE AN1955Rev 1. This way it is possible to have on the same I2C bus more than one I2C device with the same fixed part of I2C address. I2C has "normal" 100kHz and "fast" 400kHz modes, and even "ultra" is only 1. This allows the microcontroller to communicate directly with SPI devices through its I2C-bus. RX 480 + IR3567B specific support. B2 PS EXIST Indicates that Power Supply module is inserted into the shelf. STM32F103 vs GD32F103 - gStore - […] See the full post at smdprutser. The PMBus standard for digital power management is the result of collaboration between power supply and semiconductor companies. 동작 주파수 범위는 10 kHz에서 100 kHz이다. PMBus/SMBus/I2C The timing characteristics and timing diagram for the communications interface that supports I2C, SMBus and PMBus is shown below. Software Implementation of PMBus Over I2C for. Except for I2C block writes, a p can also be appended to the mode parameter to enable PEC. Ø For I2C and SMBus, the sink current requirements vary and if both are to compatible, the pull-up resistors need to be selected carefully. I'm using the Aardvark TM I2C/SPI Host Adapter to communicate with a SMBus slave device (Accuron PS401). Should I download the PS/2 and SMBus or I2C Synaptics Driver? Help. PMBus dictates a maximum bus speed of 400kHz and has built-in timeouts important for critical systems. These limits and margins will track to their new values when the output voltage changes. The newest electronic components are available at Mouser and added daily. The ZL6105 uses the I2C/SMBus™ with PMBus™ protocol for communication with a host controller and the Digital-DC bus for communication between Zilker Labs devices. Special thanks go to elmor for helping with the IR3567B PMBus commands. GitHub: Coming soon Facebook: https://www. devices to be hot swapped without restarting the system. The tool makes intense use of the I2C bus while it is running so you will likely notice microstutters in 3d games/benchmarks. It was the first time in many years that Bootlin was completely absent from an Embedded Linux Conference. With plug-and-play USB connectivity, the NI USB-8451 is a portable solution to communicate with consumer electronics and integrated circuits. Wire - The ESP8266 should work with any I2C sensor you can throw at it - just use the same Wire API calls you're used to. 7 Clock synchronization in NXP I2C Bus Specification and User manual: UM10204. I2C is a simple two-line, synchronous serial communication bus originally designed to allow communication between two or more integrated circuits that are in close proximity to each other. The current PMBus specification allows upto 400 kHz operation similar to fast I2C mode. I2C, USART and timers • 4x peripherals communication interface • 1x USART, 1x LPUART (low power) • 1x SPI 16 Mbit/s • 1x I2C (SMBus/PMBus) • 7x timers: 1x 16-bit with up to 4 channels, 1x 16-bit with up to 2 channels, 1x 16-bit ultra-low-power timer, 1x SysTick, 1x RTC and 2x watchdogs (independent/window). Two of the key differences between the I2C and SMBus are the use of defined protocols in SMBus (examples: WRITE BYTE, READ WORD) and the use of commands. The power management bus (PMBus) protocol is built upon the system management bus (SMBus) which builds upon the 2-wire open drain communication interface inter-integrated circuit (I2C or IIC). The PMBus component presents all possible. May 07, 2012 · SMBus and I2C can work together on same bus but with some constraints: Ø Due to time out constraint, SMBus cannot operate under 10 KHz. Main differences between I2C and SMBus are explained in: 4. This is information on a product in full production. The errata will specify the revision of silicon and revision of document to which it applies. The algorithm uses a bit-wise calculation that mimics the hardware shift register method. The Pi Wedge helps access the I2C and SPI signals. Application Report SLOA132–April 2009 SMBus Compatibility With an I2C Device Stephen Crump. After device reset, the weak pullup is removed and the pin is configured as an input or output. I have a interrupt driven interface for handling how the I2C uses the H/W driver to receive and transmit bytes onto and off of a buffer, essentially serialising the data. measured results for the MAX17244 synchronous buck converter. Text: Demux I²C hardware port or port emulation µC 8 VCC1 Parallel to I²C bridge µC Temp Sensor , (typ. Test Code To test the temperature sensor, tacho reading and PWM fan control test code was created for the 049 kit. The standard has been developed by Intel and is now maintained by the SBS Forum. I2C and SPI are both bus protocol to allow the user for short-distance, serial data transfer. Relative voltage margins and limits simplify design of the PMBus host controller since the power device is responsible for changing margins and limits. h, line 143 (as. The bus provides read and write access to the internal registers for configuration, and for monitoring of operating parameters. 65V to 5V SPI to 24MHz, I2C/SMBus to 1. Your code is perhaps for normal I2C sensors. The summary of significant differences between PMBus 1. 3V is required. Once ssh connection established, "Start Conversion" opens up another UI which has necessary info. Quick Overview of PMBus vs SMBus vs I2C The power management bus (PMBus) protocol is built upon the system management bus (SMBus) which builds upon the 2-wire open drain communication interface inter-integrated circuit (I2C or IIC). Right now the communication via I2C using the wire library only allows transmission of numbers between 0 and 255. 동작 주파수 범위는 10 kHz에서 100 kHz이다. Version 2 of the PSU supports a second page of data and changes the format of the FW version. This page compares UART vs SPI vs I2C interfaces and mentions difference between UART, SPI and I2C in tabular format. 2 and the proposed PMBus 1. 3 V, although systems with other voltages are permitted. , Electronics & Electrical Communications Department, PEC University of Technology, India Abstract—A number of field buses are available to exchange the. I²C uses only two bidirectional open collector or open drain lines, Serial Data Line (SDA) and Serial Clock Line (SCL), pulled up with resistors. Solved: Hi, I have a design where I read out the temperature of an FPGA (VU7P) via the SMBUS/I2C interface and via an AXI C2C connection. The System Management Bus (SMBus) is more or less a derivative of the I2C bus. The I 2 C bus and the SMBus are popular 2-wire buses that are essentially compatible with each other. 0-1017-gcp/copyright /usr. Special thanks go to elmor for helping with the IR3567B PMBus commands. The standard has been developed by Intel and is now maintained by the SBS Forum. 이 버스는 클럭, 데이터, 명령을 전달하며 필립스의 I2C의 직렬 버스 프로토콜에 기반하고 있다. Judging from my emails, it is quite clear that the I2C bus can be very confusing for the newcomer. 0 Jason Sekanina - jsekanina@linear. 电源技术中I2C及PMBus总线 1 前言 随着IT技术对工业电源技术的渗透,数字工业电源技术应运而生,由于数字工业电源的控制灵活、结构变化灵活、调节、维护方便和造价低的一系列优点,代表了工业电源技术的发展方向。. Clone via HTTPS Clone with Git or checkout with SVN using the repository’s web address. In the Prototype Stage where engineers are considering system level integration, POL-PMBUs allow design flexibility by giving Instant Rail by Rail Adjustment, Early Sequencing Planning vs. I2C: Only requires two pins (clock and data), and you can have many chips all sharing the same two lines. Can someone explain how to do a basic register read with the PMBus ? I think that the SDA is probably still okay, it is the PMBus protocol. The onboard PWM controller and MOSFETs make IR38064 a space-efficient solution, providing accurate power delivery for low. 5v vs_n vs_p op amp pmbus master select #1 pos 1-2: afx or cable. of hardware (eg. 2 and the proposed PMBus 1. I have lots of examples on using the I2C bus on the website, but many of these are using high level controllers and do not show the detail of what is actually happening on the bus. Since 1999, OpenCores is the most prominent online community for the development of gateware IP (Intellectual Properties) Cores. I2C Bus Connector and Pinout. At APEC 2019, AAC spoke with Renesas's Jeff Strang about a new series of PMBus power modules that feature two innovations they hope will make power design easier for engineers. The algorithm uses a bit-wise calculation that mimics the hardware shift register method. Like SMBus, it is a relatively slow speed two wire communications protocol based on I²C. These limits and margins will track to their new values when the output voltage changes. The ZL6105 is pin for pin compatible with the ZL2008. ALERT* (Output) PMBus SMBALERT* signal Active Low, referenced to SIG RTN. • I2C, SMBus, PMBus, MDIO, UART, low-speed SDIO, GPIO, and other two-signal interfaces • Servers • Routers (Telecom Switching Equipment) • Personal Computers • Industrial Automation 3 Description The PCA9306 device is a dual bidirectional I2C and SMBus voltage-level translator with an enable (EN) input, and is operational from 1. GitHub: Coming soon Facebook: https://www. Send an I2C command. I²C vs SPI: is there a winner? Let's compare I²C and SPI on several key protocol aspects: - Bus topology / routing / resources: I²C needs 2 lines and that's it, while SPI formally defines at least 4 signals and more, if you add slaves. Using the I2C Bus. Using the I2C Bus. A new single resistor VOUT table and the Auto Compensation. Either 4 or 6 way can be used. MA34446 PMBus Power-Supply Data Logger 7 Pin Description (continued) Note: All pins except VDD, VSS, REG18, REG25, the ADC pins, and the exposed pad are high impedance with a 55µA pullup dur-ing device power-up and reset. B2 PS EXIST Indicates that Power Supply module is inserted into the shelf. Dimensions (WxDxH). 8-Channel PMBus Power System Manager Featuring Accurate Output Voltage Measurement The LTC®2977 is an 8-channel Power System Manager used to sequence, trim (servo), margin, supervise, man-age faults, provide telemetry and create fault logs. 65V to 5V SPI to 24MHz, I2C/SMBus to 1. Contribute to aristanetworks/sonic development by creating an account on GitHub. Most SMBus transactions are a host device sending a command to a slave device. 2 mm JEDEC JEDEC compliant package from APB ­ SE97BTP , condition is reached. The power on/off sequence is also programmable by MTP. 2 and the proposed PMBus 1. • I2C, SMBus, PMBus, MDIO, UART, low-speed SDIO, GPIO, and other two-signal interfaces • Servers • Routers (Telecom Switching Equipment) • Personal Computers • Industrial Automation 3 Description The PCA9306 device is a dual bidirectional I2C and SMBus voltage-level translator with an enable (EN) input, and is operational from 1. gz /usr/share/doc/linux-headers-4. Out-of-the box protocol expertise accelerates verification development of today's IP-centric FPGA designs by providing off-the-shelf verification environments for standard protocols including ARM®, AMBA®, AXI®, PCIe®, and Ethernet or memory models for DRAM and Flash standards. Normally devices, both masters and slaves, are freely interchangeable between both buses. Aug 30, 2016 · In the Prototype Stage where engineers are considering system level integration, POL-PMBUs allow design flexibility by giving Instant Rail by Rail Adjustment, Early Sequencing Planning vs. I have lots of examples on using the I2C bus on the website, but many of these are using high level controllers and do not show the detail of what is actually happening on the bus. SMBus (System Management Bus) is a subset from the I2C protocol When writing a driver for an I2C device try to use the SMBus commands if possible (if the device uses only that subset of the I2C protocol) as it makes it possible to use the device driver on both SMBus adapters and I2C adapters. And that's just speed, not bytes-per-second or even bits-per-second, because there's overhead. 1 Freescale Semiconductor 5 Source: System Management Bus Specification, version 2. It is specified in section: 3. RX 480 + IR3567B specific support. Many of today's applications, however, require higher bus speeds and lower supply voltages. Normally devices, both masters and slaves, are freely interchangeable between both buses. PMBus commands support power supply sequencing, precision point-of-load voltage adjustmentand margining. EVKT-USBI2C-02 provides the communication interface for USB to I2C or USB to PMBus. For SMBus and I2C block writes, the write size is determined by the number of value parameters. 5V, V SS = GND, TA = -40°C to +85°C. Solved: Hi, I have a design where I read out the temperature of an FPGA (VU7P) via the SMBUS/I2C interface and via an AXI C2C connection. The System Management Bus (SMBus) is more or less a derivative of the I2C bus. SMBus data transfer format The SMBus uses the ACK signal to detect the presence of detachable devices on th e bus, so a device must always ACK its own address when the host accesses it. 3 If the I2C bus is not used, how do I tie. Index of Articles by Maxim Engineers Maxim was founded with a commitment to teach and pass on knowledge. On Wed, Oct 09, 2019 at 02:11:02PM -0500, Eddie James wrote: > Some systems may plug in either version 1 or version 2 of the IBM common > form factor power supply. The TET2000 Series is a 2100 Watt AC-DC power-factor-corrected (PFC) and DC/DC power supply that converts standard AC mains power or high voltage DC bus voltages into a main output of 12 VDC. Defined in 3 files: drivers/i2c/i2c-core-smbus. Where can I get help? What is PMBus? What is AVSBus™? How can I participate in the PMBus standard development process? Is there any training available for the PMBus? How do I get the PMBus specification? What is the difference between. Inter integrated circuits (I2C) is a multi-master, low-bandwidth, short distance, serial communication protocol. , Electronics & Electrical Communications Department, PEC University of Technology, India Abstract—A number of field buses are available to exchange the. The MPM54304 requires a minimal number external components, and is available in a space-saving LGA (7mmx7mmx2mm) package. SMBus supports a low power bus pullup specification of 350 uA and a high power mode of 3 mA, I2C species a 4 mA bus pulldown current capability. The data transfer formats of SMBus are a subset of I2C data transfer formats. Any specific requirement for a Mobo to read power stats from the PSU? go here and scroll down to "The mysterious SMBus and PMBus and their relation to I2C. External pull-up to 3. There are many peripherals that can be added to a microprocessor over the I2C and SPI serial interfaces. Input Source Voltage Operating Range 90 115/230 264 Vac Input Source Frequency 47 50/60 63 Hz Turn-on Input Voltage Ramp up 74 84 Vac Turn-off Input Voltage Ramp down 70 80. 1 Freescale Semiconductor 5 Source: System Management Bus Specification, version 2. devices to be hot swapped without restarting the system. PMBus is an extension to the more generic SMBus protocol with specific focus on power conversion and power management systems. Hi Everyone, Does anyone know where I can find some verilog examples of a PMBus slave, or even an SMBus slave? Thanks. Where can I get help? What is PMBus? What is AVSBus™? How can I participate in the PMBus standard development process? Is there any training available for the PMBus? How do I get the PMBus specification? What is the difference between. Our Pinout. What I'm looking to do is establish communication with the chip and verify the communication with the Beagle TM I2C/SPI Protocol Analyzer. This is information on a product in full production. INPUT CHARACTERISTICS Parameter Conditions Min. このような背景から、いくつかのシリアルバス規格が提唱された。 (I2C, SPI, MicroWireなど) SPIは省ピンで接続できるバスとして、モトローラ(現在はNXPセミコンダクターズ)が提唱した規格である。. Differences between I2C and SMBus In general, the I2C bus and SMBus are compatible, but there are some subtle differences between the two that could cause some problems. Defined in 3 files: drivers/i2c/i2c-core-smbus. 4mm pitch QFN The IRPS5401 is a complete power. I have lots of examples on using the I2C bus on the website, but many of these are using high level controllers and do not show the detail of what is actually happening on the bus. Devices in our large portfolio of easy-to-use buck, boost, flyback, forward and push-pull DC-DC controllers are excellent options for implementing many telemetry and control features via PMBus™ or an I2C interface, such as current limits, temperature, output current, output voltage, switching frequency, power good, soft start and more. There shall be no difference in the flowchart of Start signal, between SMbus and I2C. devices to be hot swapped without restarting the system. This page compares UART vs SPI vs I2C interfaces and mentions difference between UART, SPI and I2C in tabular format. Jun 28, 2013 · I am trying to use python-smbus on a Raspberry Pi to communicate with an MMA7660 accelerometer chip using I2C. I2C is a protocol for communication between devices. nl - […] myself into the basement with a couple of PCBs, chips and fresh flux for a couple of days. - Fast I2C 400 kHz SMBus and PMBus - USART (ISO 7816 interface and IrDA) Up to 41 I/Os, all mappab le on interrupt vectors Up to 16 capacitive sensing channels.