CP2120 SPI TO I2C BRIDGE AND GPIO PORT EXPANDER is a Silicon Laboratories product that integrates a clock, voltage monitor, SPI to I2C converter. It supports up to 1.0Mbit/s data transmission, can be configured as the least significant bit or the most significant bit first byte transmission. I2C master interface can be configured at a configurable rate of up to 400kHz, with 255 RX and TX data buffers. Input and output port pins can be configured as push-pull or open-drain, with one pin configurable as an edge-triggered interrupt source. All pins support 5V, INT active low interrupt pin, operating voltage is 2.7V to 3.6V, typical operating current is 6.4mA. The product uses lead-free 20-pin QFN package.
The CP2120 is a highly integrated SPI‑to‑I²C bridge controller that also provides eight configurable GPIO pins and an edge‑triggered interrupt pin in a compact 4 × 4 mm QFN‑20 package. It enables simple communication with I²C devices via an SPI master interface, requiring only pull‑up resistors on the I/O pins.
The document includes a full pin‑out chart, package dimensions, absolute maximum ratings, global DC electrical characteristics, and timing diagrams. It also lists the internal register map and revision history for the device.
| Supply Voltage (VDD) | 3.0 V – 3.6 V |
|---|---|
| Operating Temperature Range | -40 °C to +85 °C |
| Typical Operating Current | 6.4 mA |
| Package Type | 20‑pin QFN |
The CP2120 operates from 3.0 V to 3.6 V supply voltage.
It provides eight configurable GPIO pins plus one pin that can be used as an edge‑triggered interrupt source.
Typical operating current is 6.4 mA.