System Overview

The CP2120 is a highly-integrated SPI-to-I2C Bridge Controller with an SPI interface that provides a simple and reliable method for communicating with I2C devices. The CP2120 includes a 4-wire serial peripheral interface (SPI), a serial I2C interface, 256 byte data buffers, an internal oscillator, eight input/output port pins, and one pin configurable as an edge-triggered interrupt source in a compact 4x4 package. No external components other than pull-up resisters on the I2C pins are required. The SPI Master controls the CP2120 across the SPI interface using a command set that governs all CP2120 configuration and operation.

Single Chip SPI to I2C Transfer

● Integrated clock; no external clock required

● On-Chip Voltage Monitor

Slave Serial Peripheral Interface (SPI)

● Up to 1.0 Mbit/s Transfers

● Configurable to Least Significant Bit or Most Significant

Bit first byte transfers

I2C Master Interface

● Operates at configurable rates up to 400 kHz

● 255 RX and TX Data Buffers

Input and Output Port Pins

● 8 Pins Configurable as Push-Pull or Open-Drain

● 1 Pin Configurable as an edge-triggered interrupt

source

● All pins 5 V Tolerant

● INT active low interrupt pin

Supply Voltage of 2.7 V to 3.6 V

● Typical operating current: 6.4 mA

Package

● Pb-free 20-pin QFN