Diodes Incorporated PI7C9X762BLE

Overview

PI7C9X762BLE from Diodes Incorporated is a dual-channel, I²C/SPI-to-UART bridge controller with 64-byte TX/RX FIFOs per channel, hardware/software flow control, RS-485 direction control via RTS, and IrDA SIR support up to 1.152 Mbps. It operates from 1.8 V, 2.5 V, or 3.3 V across –40 °C to +85 °C and targets industrial embedded systems requiring protocol translation between microcontrollers and legacy serial peripherals.

For engineers reviewing the PI7C9X762BLE datasheet, PI7C9X762BLE pinout, PI7C9X762BLE application, or PI7C9X762BLE equivalent, key selection criteria include dual UART channel independence, programmable FIFO trigger levels, automatic RS-485 half-duplex control, I²C fast-mode (400 kHz) or SPI slave mode (33 MHz), and GPIO flexibility for modem signaling or system control.

Technical Context

The PI7C9X762BLE 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 register compatibility with the industry-standard 16C450. Its I²C interface supports only slave mode at up to 400 kHz, while SPI operates in Mode 0 (CPOL=0, CPHA=0) at up to 33 Mbps.

Hardware flow control uses dedicated RTS/CTS pins per channel with Auto-RTS and Auto-CTS enabled independently via EFR[6:7]; software flow control supports dual Xon/Xoff character sets with configurable comparison logic. Internal loopback, line break detection, and special character recognition are implemented at the register level without host intervention.

Key Specifications

Pinout & Package

PI7C9X762BLE is available in two RoHS-compliant packages: 28-pin TSSOP (4.4 mm × 9.7 mm) and 32-pin TQFN (5 mm × 5 mm, 0.5 mm pitch) with exposed thermal pad connected to VSS. Both packages support identical pin functions but differ in pin count and layout to accommodate I²C vs. SPI interface selection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SC16IS752IPW and MAX3107ETE+, the PI7C9X762BLE uniquely integrates RS-485 auto-direction, IrDA SIR, and 8 GPIOs in a single dual-UART device - delivering full fieldbus interoperability without external components or layout compromises.

Availability

PI7C9X762BLE is available at Aetrix Electronics and suitable for industrial automation, smart metering, and medical point-of-care terminals requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for PI7C9X762BLE 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 and mixed-signal solutions for industrial, computing, and consumer markets.

The PI7C9X762BLE belongs to Diodes' UART bridge controller product line, designed specifically to simplify protocol translation between modern microcontrollers and legacy serial peripherals in space- and power-constrained embedded systems.

FAQ

What interface modes does the PI7C9X762BLE support, and how is the mode selected?

The PI7C9X762BLE supports either I²C-bus (fast-mode, 400 kHz) or SPI (slave Mode 0, up to 33 MHz) as its primary host interface. Selection is determined by the logic level on the dedicated I2C/SPI pin: HIGH configures I²C mode, LOW configures SPI mode. This pin must be hardwired at power-up and cannot be changed dynamically in operation.

How does the PI7C9X762BLE handle RS-485 half-duplex bus direction control?

The PI7C9X762BLE provides automatic RS-485 driver direction control via its RTS outputs (RTSA/RTSB). When enabled, RTS asserts before transmission and deasserts after the final stop bit, with configurable polarity inversion. The device also supports external direction control using GPIOs if precise timing override is required.

Can both UART channels operate independently with different configurations?

Yes - UART Channel A and Channel B are fully independent. Each has its own set of registers for baud rate, data format, FIFO trigger levels, flow control settings, and modem control. They share only the host interface bus and power domains, enabling simultaneous use with mismatched protocols (e.g., RS-232 on A, RS-485 on B).

What is the function of the eight GPIO pins, and how are they mapped to modem signals?

The eight GPIO pins (GPIO0–GPIO7) are software-configurable as either general-purpose I/O or standard modem control signals: DSR/DTR/CD/RI per channel. Mapping is defined in the GPIO Control Register and follows a fixed pairing (e.g., GPIO4/DSRA, GPIO5/DTRA), allowing direct replacement of legacy modem interface ICs without redesign.