Diodes Incorporated PI7C9X762CZHE

Overview

PI7C9X762CZHE 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. It operates at up to 33 Mbps SPI clock rate and 16 Mbps UART baud rate, features eight programmable GPIOs, and targets RS-232/RS-485/RS-422 interface bridging in space-constrained embedded systems.

For engineers reviewing the PI7C9X762CZHE datasheet, PI7C9X762CZHE pinout, PI7C9X762CZHE application, or PI7C9X762CZHE equivalent, key selection considerations include dual UART channel independence, I²C vs. SPI interface strapping, RTS/CTS hardware flow control timing behavior, IrDA SIR support up to 1.152 Mbps, and GPIO multiplexing with modem signal functions (DSR/DTR/CD/RI).

Technical Context

The PI7C9X762CZHE implements two independent UART channels (A and B), each with fully programmable framing (5–8 bit, parity, 1/1.5/2 stop bits), fractional baud rate generation, and local loopback mode. Its register set mirrors the industry-standard 16C450, enabling drop-in software compatibility while extending functionality via Enhanced Features Register (EFR) and Trigger Level Register (TLR).

Hardware flow control uses Auto-RTS and Auto-CTS with configurable halt/resume thresholds stored in the Transmission Control Register (TCR); software flow control supports dual Xon/Xoff character sets with programmable comparison logic. The device supports both crystal (up to 24 MHz) and external clock (up to 64 MHz) inputs, and integrates RS-485 driver direction control via RTS inversion.

Key Specifications

Pinout & Package

PI7C9X762CZHE is housed in a 32-pin TQFN (ZH) package with exposed thermal pad (VSS). Pin 1 index is marked on top-side silkscreen; center pad must be soldered to PCB ground plane for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel I²C/SPI-to-UART bridge applications.

Compared with SC16IS752 and MAX3107, the PI7C9X762CZHE uniquely combines I²C/SPI dual-interface flexibility, RS-485 driver control, and IrDA SIR in a single industrial-grade package-making it optimal for mixed-protocol edge gateways where interface adaptability and physical-layer integration are design priorities.

Availability

PI7C9X762CZHE is available at Aetrix Electronics and suitable for industrial computing, factory process control, and battery-operated devices requiring stable component supply across extended product lifecycles.

Supply support for PI7C9X762CZHE 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 manufacturer of discrete semiconductors and integrated circuits, specializing in high-performance analog, logic, and interface solutions for industrial, computing, and consumer markets.

The PI7C9X762 belongs to Diodes' high-integration bridge controller product line, designed specifically to simplify protocol translation between modern digital buses (I²C/SPI) and legacy serial interfaces (RS-232/422/485) in resource-constrained embedded systems.

FAQ

What interface modes does the PI7C9X762CZHE support, and how is selection performed?

The PI7C9X762CZHE supports either I²C-bus (fast-mode, slave-only) or SPI (mode 0, slave-only), selected at power-up by the logic level on the dedicated I2C/SPI pin: HIGH configures I²C mode, LOW configures SPI mode. This strapping occurs before internal initialization and determines pin functionality (e.g., SDA vs. SI/SO), register access method, and clock source interpretation. No runtime switching is supported.

How does hardware flow control operate on UART channels A and B independently?

Auto-RTS and Auto-CTS are enabled per channel via the Enhanced Features Register (EFR[7:6]). For UART A, RTSA and CTSA control data flow; for UART B, RTSB and CTSB serve the same role. Each channel's RTS assertion is governed by its own RX FIFO halt/resume thresholds stored in the Transmission Control Register (TCR), allowing asymmetric flow control behavior between channels without cross-interference.

Can the GPIO pins be used simultaneously as general-purpose I/O and modem control signals?

No-each GPIO pin (GPIO0–GPIO7) is functionally multiplexed: it operates either as a bidirectional general-purpose I/O or as a dedicated modem signal (DSR/DTR/CD/RI), selected via configuration bits in the GPIO Control Register and Modem Control Register. Simultaneous use as both is not supported; the function must be fixed at initialization and cannot be dynamically reconfigured during operation.

What is the maximum UART baud rate achievable, and what clock sources support it?

The PI7C9X762CZHE supports UART baud rates up to 16 Mbps using 4× oversampling, enabled by a timing reference clock up to 64 MHz applied to XTAL1. With an external 64 MHz clock, the fractional baud rate generator (divisor range 1–65535) achieves precise rates including standard values (e.g., 921.6 kbps, 3 Mbps) and non-standard rates required for proprietary protocols.