PI7C9X1172CZHE

Controllers Overview

The PI7C9X1172 is a dual-channel full-duplex UART bridge controller that converts I2C-bus or SPI signals to RS-232/RS-485 serial data. It features 64-byte transmitter and receiver FIFOs, supports baud rates up to 16 Mbit/s with 4x sampling, and operates on a wide voltage range of 1.62V to 3.63V (1.8V, 2.5V, or 3.3V). The device includes up to eight programmable GPIO pins, IrDA SIR support, and hardware/software flow control. It is available in QFN32 and TSSOP28 packages and maintains backward compatibility with the industry-standard 16C450 register set.

Controllers Feature Summary

• Dual-channel full-duplex UART architecture with 64-byte TX/RX FIFOs
• I2C-bus and SPI interface support with slave mode operation
• Backward compatible with 16C450 register sets for easy integration
• Integrated IrDA encoder/decoder and automatic RS-485 direction control

Controllers Applications

• Industrial computing systems
• Factory process control automation
• Mobile and battery-operated handheld devices
• Embedded networking applications

Controllers Procurement Notes

Verify the specific package variant required for your design, as the PI7C9X1172 is offered in both QFN32 and TSSOP28 form factors. Confirm the interface configuration by checking the state of the I2C/SPI# pin during initialization. Ensure that pull-up resistor values are appropriate for the selected supply voltage when utilizing the I2C bus interface.

Controllers Selection Notes

Select this component when a compact solution is needed to bridge digital host interfaces to legacy serial peripherals. The wide operating voltage range makes it suitable for multi-voltage systems. Consider the GPIO availability if additional control lines are required without expanding the system bus. Verify thermal requirements for the chosen package type in enclosed environments.

Controllers Part Context

This device belongs to the PI7C9X11xx series of UART bridge controllers from Diodes Incorporated. It shares architectural similarities with other models in the family but distinguishes itself through its dual-channel capability and specific FIFO depth. The series targets cost-sensitive embedded markets requiring reliable serial communication conversion.

Controllers Replacement Considerations

The datasheet notes backward compatibility with the SC16IS750/760 register sets. Designers migrating from these components should verify pinout differences between the TSSOP28 and QFN32 packages to ensure mechanical fit.