I2C slave to SPI master/GPIO bridges

These bridges connect to an I2C master port of a microcontroller or other host processor and allow you to communicate with SPI slave peripherals. The bridges have an I2C slave interface on one side and an SPI master interface on the other. The bridges can also be used to provide additional GPIO to an I2C master by utilizing unused SPI slave select outputs.

Each high-speed serial bridge allows you to add up to 4 SPI slave devices making them ideal for host processors without native SPI capabilities. The bridges have 8 selectable I2C addresses allowing you to further expand the host processor's SPI capabilities by using multiple bridges. The multiple I2C addresses also help avoid conflict with other I2C devices.

The SPI master interface of our bridges support SPI speeds up to 1.8Mbps using an internal oscillator or up to 4Mbps when used with an external oscillator. The I2C slave interface of our bridges supports speeds up to 400KHz. Deep data buffers between the I2C and SPI interfaces enhance translation performance efficiency.

Our I2C slave to SPI master/GPIO bridges operate from 2.4V to 3.6V and feature a low-power mode. They are available in TSSOP packaging.

I2C slave to SPI master bridging allows a host with an I2C interface to transparently communicate with devices attached to the SPI-bus. This allows you to retain proprietary or specialized SPI peripherals such as an LCD display or an EEPROM in your I2C-based design.

While seamlessly adding an SPI bus controller to an I2C bus, our bridge allows you to configure unused SPI slave select outputs as GPIO without the need for additional hardware. With the availability of extra GPIO, you can expand your system's capabilities with:

• System monitoring
• Diagnostics
• LED lighting/blinking
• Button/Keypad press detection
• Status information

Product	SPI SS* /GPIOs	Oscillator	SPI Speed
SC18IS602	4	Internal	1.8Mbps
SC18IS603	3	External	4.0Mbps

* SPI SS is the number of available SPI Slave Select outputs

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SC18IS602 See SC18IS602B replacement

SC18IS602B I2C slave bridge to SPI master bridge with internal clock, SS2 SPI slave select signal

SC18IS603 I2C slave bridge to SPI master bridge with external clock

• NXP SC18IS602 I2C Slave to SPI Master/GPIO Bridge Demoboard

• Bridges