#I2C VS UART PERFORMANCE SERIAL#

CS pins used in the main controller to toggle chips (can be toggled with GPIOs or dedicated CS pins) Depends on bus capacitance and pull-up resistor values (use RC time constant) Fixed by clock window time, reaches up to 60 Mbps

#I2C VS UART PERFORMANCE SERIAL#

Serial clock (SCL, sometimes named SCK) They do have some important differences as summarized in the table below. Neither of these interfaces has an impedance requirementĬlearly, these interfaces are very similar.The signal level can be set by the core voltage given to the chip.Most microcontrollers will have one or both of these interfaces integrated.Other chips on the bus are addressable or toggle-able.The clock is source-synchronous, meaning there is a single trace that carries the clock line.They use more than one wire for sending/receiving data.These two interfaces have some common characteristics: The Serial Peripheral Interface (SPI) and Inter-Integrated Circuit (I2C) protocols are both simple serial digital protocols that run at low to moderate speeds. There is also the matter of the type of Flash memory you'll need to access (NOR vs. When choosing a memory chip, you'll want to match the application requirements and functionality with the bus speed you need for read and write operations in your memory chip. Flash chips are a very common component in embedded systems and can offer high capacities of non-volatile memory up to Gb values. One of the common implementations of SPI and I2C in a PCB layout is as a protocol for reading and writing to an external Flash memory. This means that, on the PCB, the design requirements are relatively simple and there is still some freedom within the standard to tune the performance as you would like. Unlike impedance-controlled high-speed differential serial protocols, these two protocols do not have an impedance specification and will often be considered electrically short. SPI and I2C are both easy-to-use, hard-to-break serial digital protocols that are quite easy to route from a signal integrity perspective. You can learn more about I2C in Introduction to the I2C Bus from All About Circuits.SPI and I2C are probably the most commonly used digital protocols to connect integrated circuits in a diverse array of products. The tradeoff for this simplified wiring is slower speeds than SPI.

I2C uses fewer wires and all data is transmitted on a single wire, keeping your pin count low.

This provides each slave device with what it needs while also supporting multiple masters. However, the Arduino must first select a specific device by transmitting a unique address before sending data. Maintaining a clear communication pathway is possible because I2C uses an address system and a shared bus, meaning many devices can be connected to the exact same wires. I2C makes it possible to connect multiple masters and slaves to your board while maintaining a clear communication pathway. When connecting two circuits to one another, think of the main device as the âmasterâ and the connected devicesâsuch as sensors, pin expansions, and driversâas âslavesâ. In fact, I2C allows you to potentially connect up to 128 devices to your main board! While this peripheral is almost never used for PC-device communication, it is incredibly popular with modules and sensors, making it useful for projects that require many parts working together. I2C, which stands for inter-integrated-circuit, is a serial communications protocol specially designed for microcontrollers.

I2c vs uart performance