Diodes Incorporated
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I2C/SPI to Dual UART Bridge Controller

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The PI7C9X762 is a I2 C-bus/SPI to a dual-channel high performance UART bridge controller. It offers data rates up to 33Mbps and guarantees low operating and sleeping current. The PI7C9X762 also has up to 8 additional programmable general purpose I/O [GPIO] pins. The device comes in very small TSSOP28 packages, which makes it ideally suitable for cost efficient, handheld, battery operated applications. These UART bridges provide protocol conversion from I2C -bus or SPI to RS232/RS-485/RS-422 and are fully bidirectional.

The PI7C9X762 supports SPI clock speeds up to 33Mbps and IrDA SIR up to 1.152Mbit/s.

The PI7C9X762’s internal register set is backward-compatible with the widely used and widely popular 16C450 UART. The PI7C9X762 also provides additional advanced features such as auto hardware and software flow control, automatic RS-485 support, support for fractional baud rates and software reset. This allows the software to reset the UART at any moment, independent of the hardware reset signal.


  • Dual channel full-duplex UART
  • Support I2C-bus or SPI interface
  • 64 bytes FIFO (transmitter and receiver)
  • Fully compatible with industrial standard 16C450 and equivalent
  • Baud Rates up to 16Mbit/s in 4X sampling clock rate
  • Programmable character formatting
    • 5-bit, 6-bit, 7-bit or 8-bit character
    • Even, odd, or no parity
    • 1, 1.5, or 2 stop bits
  • Programmable Receive and Transmit FIFO trigger levels
  • Special character detection
  • Internal Loopback mode
  • Line break generation and detection

Flow Control

  • Support hardware flow control using RTS/CTS
  • Support software flow control with programmable Xon/Xoff characters
  • Programmable single or double Xon/Xoff characters

Interface Control

  • Automatic RS-485 slave address detection
  • RS-485 driver direction control via RTS signal
  • RS-485 driver direction control inversion
  • Built-in IrDA encoder and decoder interface
  • Supports IrDA SIR with speeds up to 115.2kbit/s (optional 1.152Mbps)
  • Up to eight user programmable GPIO pins
  • Software reset


  • Low standby current at 3.3V
  • Wide operation voltage (1.8V, 2.5V or 3.3V)
  • Industrial temperature ranges -40˚C to 85˚C

I2C Interface

  • ompliant with I2C-bus fast speed
  • Support slave mode only
  • Crystal oscillator (up to 24MHz) or external clock (up to 64MHz) input

SPI Interface

  • PI7C9X762 supports 33 Mbit/s maximum SPI clock speed
  • upport SPI mode 0 (slave mode only)
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)
  • For automotive applications requiring specific change control (i.e. parts qualified to AEC-Q100/101/104/200, PPAP capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative. https://www.diodes.com/quality/product-definitions/
  • Packaging (Pb-free & Green):
    • 28-Pin, TSSOP (L)
    • 32-Pin, TQFN (ZH)


  • Industrial computing
  • Automation
  • actory process control
  • Mobile computing
  • Embedded applications
  • Battery operated devices
  • Networking

Product Specifications

Product Parameters

Ports 2 UART
Pins 28,32
Data Rate (kbps) 16Mbps
Bytes 64
Tx/Rx FIFO Ctrs Yes
Tx/Rx FIFO INT Trig Yes
Auto RTS/CTS Yes
Interface I2C/SPI
Ambient or Junction Temperature (°C) -40 to 85

Technical Documents

Recommended Soldering Techniques


Additional Technical Documents are available upon request:
Application information, Evaluation board, and Other technical documents

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Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN # Issue Date Implementation Date Subject
PCN-2520 2021-05-27 2021-08-27 Qualified Additional Bump Site and Assembly/Test (A/T) Sites
PCN-2328 2018-04-12 2018-10-12 Device End of Life for tray packaging only


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