PCA9535CD,112

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I/O expanders are a type of integrated circuit that increase the amount of digital input/output pins available on a single processor or device bus. This increases system performance and makes it easier to control peripherals. The PCA9535CD,112 is an I/O expander developed by NXP Semiconductors, based on the I2C protocol. It is a popular model due to its integrated level shifters, allowing it to work with multiple VDDIO operating voltage levels.

The PCA9535CD,112 offers sixteen digital I/O channels, as well as an Internal Reset function. These channels have numerous applications and design flexibility, such as LED control, keypad scanning and remote sensing. The integrated level shifters allow for easy voltage level translation between the processor and the peripheral device. This expander also features programmable resilience and drive current over the channels, with a maximum high-level output current of 24 mA.

The PCA9535CD,112 can be programmed via the I2C serial interface, enabling multiple devices to communicate over the same bus. The I2C specifications allows it to operate at transfer speeds of up to 100 kHz, making it a suitable device for real-time operation. Data is sent and read through the I2C serial interface, which includes four control pins (SCL, SDA, INT, RESETN and SHD).

The I2C specification also features on-chip brown-out detection and resetting. This ensures that the PCA9535CD,112 remains operational and can reset itself if the power supply voltage drops below a certain level. This provides stability and protection to the system in the event of power fluctuations. The I2C further provides immunity to EM interference, allowing it to operate even in harsh environments.

The PCA9535CD,112 is advanced and feature-rich, making it a suitable and cost-effective solution for a wide range of I/O expander applications. For example, it can be used to control peripheral devices, to read and write data, to facilitate communication between multiple devices, and to facilitate level shifting. The various I2C integration features make it a reliable, secure, and versatile solution for any I/O expander application.

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