CP212x SPI-to-I2C Bridges

CP212x SPI-to-I2C Bridge Device and GPIO Port Expander

The CP2120 compact SPI-to-I²C bridge and general purpose port expander device can be easily added to a system to solve interface compatibility problems and add more GPIO when required. CP2120 includes a four-wire slave SPI bus, bridge control logic, a bidirectional I²C bus interface, and eight general-purpose input/output (I/O) pins. A SPI master communicates with other I²C devices by instructing the CP2120 to send and receive I²C data traffic using the simple command set. CP2120 can act as a master-transmitter and a master-receiver on the I²C bus and handle all I²C timing, addressing, and arbitration.

CP212x SPI-to-I2C Bridge Common Specs

4-wire SPI bus operates at frequencies up to 1 MHz
Fully functional I²C master transmit and receive operation
I²C data at frequencies configurable up to 400 kHz

255 byte data receive and transmit buffers
Internal oscillator
2.4 to 2.6 V operation

Active LOW interrupt output
5 V tolerant I/O pins
8 general purpose I/O pins

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Part Number	Interface	Package Type	Package Size (mm)
CP2120 (EOL) Dev Kit	SPI to I2C	QFN20	4x4

Part Number

Interface

Package Type

Package Size (mm)

CP2120

(EOL) Dev Kit

SPI to I2C

QFN20

4x4

CP212x SPI-to-I2C Bridge Device and GPIO Port Expander

CP212x SPI-to-I2C Bridge Common Specs

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