Contents
How long can SPI cables be?
approximately 10 m
While the SPI communication method is generally suitable for distances up to approximately 10 m, to bridge longer distances, a repeater is often needed because of attenuation due to the increased line resistance of long cables. These signals must be amplified again.
What is speed of SPI?
Comparison
| | SPI | I2C |
|---|---|---|
| Max speed | No limit (10-100 Mbps is common) | 400 kbps in fast mode (3.4 Mbps is possible with high-speed mode) |
| No. of peripherals | Only limited by number of pins available for SS lines on master | 112 with 7-bit addressing |
| Multi-master | No | Yes |
| Flow control | No | Yes |
How is the SPI bus used for long distance communication?
Extending the SPI bus for long-distance communication The serial peripheral interface (SPI) bus is an unbalanced or single-ended serial interface designed for short-distance communication between integrated circuits. Typically, a master device exchanges data with one or multiple slave devices. The data exchange is full-duplex and requires syn-
What kind of resistors should I use for long SPI bus lines?
2k2 may work with 10kHz, with 1MHz you need a smaller value – the higher the resistor value the slower are the signal edges (caused by RC, where C is the capacitance of the long wire). Use something like 50-220ohm with ~xMHz SPI frequencies.
How is the Serial Peripheral Interface ( SPI ) bus used?
The serial peripheral interface (SPI) bus is an unbalanced or single-ended serial interface designed for short-distance communication between integrated circuits. Typically, a master device exchanges data with one or multiple slave devices.
Can a SPI Bus connect to a master device?
SDI, DI, DIN, SI – on master devices; connects to MISO on slave, or to above connections The SPI bus can operate with a single master device and with one or more slave devices. If a single slave device is used, the SS pin may be fixed to logic low if the slave permits it.