Diodes Incorporated PI7C9X762CLE

Overview

PI7C9X762 from Diodes Incorporated is a dual-channel I²C-bus/SPI-to-UART bridge controller with 64-byte TX/RX FIFOs, backward-compatible register mapping to the 16C450 UART, and support for hardware/software flow control, RS-485 direction control, and IrDA SIR up to 1.152 Mbps. It operates across 1.8V/2.5V/3.3V supplies and delivers up to 33 Mbps SPI throughput in a 32-pin TQFN package.

For engineers reviewing the PI7C9X762 datasheet, PI7C9X762 pinout, PI7C9X762 application, or PI7C9X762 equivalent, this device serves as a high-integration protocol converter for embedded industrial gateways, battery-powered telemetry nodes, and RS-485-based factory automation controllers requiring low-power dual UART bridging with GPIO expansion.

Technical Context

The PI7C9X762 implements two independent UART channels (A and B), each with fully programmable framing (5–8 bit, parity, stop bits), fractional baud rate generation, and configurable FIFO trigger levels via FCR and TLR registers. Its dual-interface architecture allows runtime selection between I²C (fast-mode, up to 400 kHz) and SPI (mode 0, slave-only, up to 33 MHz) host connectivity.

Hardware flow control is implemented through dedicated RTS/CTS pins per channel with Auto-RTS/Auto-CTS logic governed by TCR and EFR registers; software flow control supports dual Xon/Xoff character sets with configurable comparison modes. RS-485 driver direction is managed automatically via RTS signal polarity inversion, eliminating external transceiver control logic.

Key Specifications

Pinout & Package

Package: 32-pin TQFN (ZH), 5 mm × 5 mm, 0.5 mm pitch, exposed thermal pad (VSS-connected).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel UART bridge applications.

Compared with SC16IS752 and MAX3107, the PI7C9X762 uniquely combines dual UARTs, SPI/I²C dual-interface support, eight GPIOs with modem signal aliases, RS-485 auto-direction, and IrDA SIR - delivering highest integration density for space-constrained industrial and portable designs.

Availability

PI7C9X762 is available at Aetrix Electronics and suitable for industrial computing, factory process control, and battery-operated devices requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for PI7C9X762 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal solutions for industrial, computing, and consumer markets, with manufacturing certified to IATF 16949 and quality standards aligned with AEC-Q200.

The PI7C9X762 belongs to Diodes' high-performance interface bridge product line, designed specifically for protocol translation between modern host interfaces (I²C/SPI) and legacy serial peripherals in resource-constrained embedded systems.

FAQ

What voltage levels does the PI7C9X762 support for VDD?

The PI7C9X762 supports three nominal supply voltages: 1.8 V, 2.5 V, and 3.3 V. Each VDD pin (pins 1, 5, 13, 28) must be supplied at the same selected voltage. I/O logic levels track VDD, and internal regulators scale biasing accordingly - no external level shifters are needed when interfacing with matching-voltage hosts or peripherals.

How is RS-485 driver direction controlled without external logic?

RS-485 direction control is implemented internally using the RTS output signal. When Auto-RTS is enabled and RTS polarity inversion is configured via the Enhanced Features Register, the device asserts RTS to enable the driver during transmission and deasserts it to enable the receiver - all synchronized to frame boundaries without timing-critical external gates or delays.

Can both UART channels operate simultaneously with different interface protocols?

No - the I2C/SPI pin (pin 6) selects a single host interface mode for the entire device. Both UART channels share the same selected interface (either I²C or SPI) and are accessed via the same bus. However, each channel maintains independent configuration registers, FIFOs, and interrupt status, enabling true concurrent operation under shared bus arbitration.

Is the 64-byte FIFO depth per channel or shared between channels?

The 64-byte FIFO is allocated independently per channel: 64 bytes for TXA/RXA and another 64 bytes for TXB/RXB. Each FIFO has its own programmable trigger level register (TLR), interrupt enable bits, and status flags - ensuring deterministic latency and buffer management for time-sensitive dual-serial applications like Modbus master/slave coexistence.