I 2 c requires a mere two wires, like asynchronous serial, but those two wires can support up to 1008 slave devices. Smba is an optional signal in smbus mode, and this signal is not applicable if smbus is disabled. The i2c bus was designed by philips in the early 80s to allow easy communication between components which reside on the same circuit board. In the block diagram, there are mainly three pins that are sda, scl, and smba. The sc18im700 is designed to serve as an interface between the standard uart port of a microcontroller or microprocessor and the serial i 2 c bus. The block diagram of i2c is same in all the sts microcontroller. The i2cbus and how to use it including specifications. I2c hardware block datasheet cypress semiconductor. However, if the i2c interface is implemented by the software, the microcontroller has to sample sda line at least twice per clock pulse in order to detect changes. A block diagram of the i2c module is shown in figure 1. In this article, lets discuss the block diagram of i2c. Both sda and scl pins are preceded by a noise filter which is.
Smbus provides a control bus for system and power management related tasks. System management bus smbus, defined by intel in 1995, is a subset of i. The interintegrated circuit i2c protocol is a protocol intended to allow. Here are some of the features of i2c bus compatible ics. You can use it as a flowchart maker, network diagram software, to create uml online, as an er diagram tool, to design database schema, to build bpmn online, as a circuit diagram maker, and more.
The di2cs core provides an interface between a microprocessor microcontroller and an i2c bus. The sc18im700 is designed to serve as an interface between the standard uart port of a microcontroller or microprocessor and the serial i2cbus. Download our latest development and embedded software solutions. C interintegrated circuit, pronounced isquaredc, is a synchronous, multi master. Through this software you can put your favorite picture on i2c lcd. The i2c bus is currently still a common communication peripheral used. To simplify detection of i2c commands on the bus in such cases, a. You can use the i2cget command from the command line to read the i2c bus. The i2c hardware will detect start condition, receive the i2c address and interrupt the software if necessary. The default ez i2c slave in the component catalog is a schematic macro using an ez i2c slave. Moreover, since they clip directly onto the i 2c bus without any additional external interfacing, they allow a prototype system to be modified or upgraded simply by clipping or unclipping ics to or from the bus.771 353 1272 983 1357 639 1254 49 252 1276 1371 1383 1413 1089 1080 1261 1571 1462 933 1526 927 1189 246 1026 1445 471 836 1477 601 405 1080 796 557 1061 66 465 1400 869 535 218 741 120 1287