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I2C/SPI to Single UART Bridge Controller

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The PI7C9X1170 is a I2C-bus/SPI to a single-channel high performance UART bridge controller. It offers data rates up to 33 Mbps and guarantees low operating and sleeping current. The PI7C9X1170 also has up to 8 additional programmable general purpose I/O [GPIO] pins. The device comes in very small TSSOP24 and TSSOP16 packages, which makes it ideally suitable for cost efficient, handheld, battery operated applications. These UARTs provide a bridge for protocol conversion from I2C -bus or SPI to and RS-232/RS-485 and are fully bidirectional.

The PI7C9X1170 supports SPI clock speeds up to 33 Mbps and IrDA SIR up to 1.152 Mbit/s.

PI7C9X1170’s internal register set is backward-compatible with the widely used and widely popular 16C450 UART. The PI7C9X1170 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 signalThis allows the software to reset the UART at any moment, independent of the hardware reset signal.


  • Single 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 115.2 kbit/s ( optional 1.152Mbps)
  • Up to eight user programmable GPIO pins
  • Software reset


  • Low standby current at 3.3 V
  • Wide operation voltage (1.8V, 2.5V or 3.3V)
  • Industrial and commercial temperature ranges
  • Available in QFN24, TSSOP24 and TSSOP16 Packages

I2C interface

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


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

Product Specifications

Product Parameters

Ports 1 UART
Pins 16,24
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

Request Documents
Orderable Part Number Status Package Environmental Compliance Packing Buy from Distributor /
Contact Sales
Request Samples
Qty. Carrier
PI7C9X1170ABLE Obsolete TSSOP-24 GREEN 62 TUBE
PI7C9X1170ABLEX Obsolete TSSOP-24 GREEN 3000 T&R


Authorized Distributor Quantity Inventory Date Countries/Regions Buy Online
Arrow Electronics 30 1/26/2022 United States Buy Now
Request Sample
PI7C9X1170ACLEX Active TSSOP-24 GREEN 3000 T&R Contact Sales Request Sample
PI7C9X1170BBLE Obsolete TSSOP-16 GREEN 96 TUBE
PI7C9X1170BBLEX Obsolete TSSOP-16 GREEN 2500 T&R
PI7C9X1170BCLE Active TSSOP-16 GREEN 96 TUBE Contact Sales Request Sample
PI7C9X1170BCLEX Active TSSOP-16 GREEN 2500 T&R Contact Sales Request Sample
PI7C9X1170BZDEX Obsolete V-QFN4040-24 GREEN 3500 T&R
PI7C9X1170CZDE Obsolete V-QFN4040-24 GREEN 490 TRAY
PI7C9X1170CZDEX Active V-QFN4040-24 TPGP 3500 T&R Contact Sales Request Sample

Environmental Compliance Legend:
LFF: Pb-Free Finish and RoHS 5/6
TLFP: Totally Pb-Free Product and RoHS 6/6
LFGP: Pb-free Finish and Green Product, RoHS 5/6 and Halogen Free
TPGP: Totally Pb-Free and Green Product, RoHS 6/6 and Halogen Free
GREEN: Halogen-free and RoHS compliant
RoHS: RoHS compliant but NOT halogen-free


Product Change Notices

PCN # Issue Date Implementation Date Subject
PCN-2510 2021-02-26 2021-05-26 Qualified Additional A/T Sites, Fab Site and Data Sheet Change
PCN-2364 2018-10-04 2019-04-04 Device End of Life (EOL)
PCN-2328 2018-04-12 2018-10-12 Device End of Life for tray packaging only