SC18IM704: UART to I²C-Bus Bridge | NXP Semiconductors

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UART to I²C-Bus Bridge

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SC18IM704 is designed to serve as an interface between the standard UART port of a microcontroller or microprocessor and the serial I²C-bus; this allows the microcontroller or microprocessor to communicate directly with other I²C-bus devices. SC18IM704 can operate as an I²C-bus controller. SC18IM704 controls all the I²C-bus specific sequences, protocol, arbitration and timing. The host communicates with SC18IM704 with ASCII messages protocol; this makes the control sequences from the host to SC18IM704 become very simple.

SC18IM704 is a functional replacement for SC18IM700 with exception of: new pinout, GPIO without quasi bidirectional mode, operating supply voltage lower level to 1.71 V vs 2.4 V and temperature range of -40 °C to 105 °C vs -40 °C to 85 °C.

Block Diagram

SC18IM704PW

SC18IM704PW Block Diagram
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Features

Key Features

  • UART host interface to I²C-bus controller
  • Eight programmable I/O pins
  • High-speed UART: baud rate up to 460.8 kbit/s
  • UART message format resembles I²C-bus transaction format
  • 8 N 1 UART format (8 data bits, no parity bit, 1 stop bit)
  • Fast-mode I²C-bus: 375 kHz
  • 256-byte TX and RX FIFO
  • 1.71 V and 3.6 V operation with 5 V tolerant I/O pins

Temperature Range

  • -40 to 105 °C

ESD Protection

  • Exceeds 2000 V HBM per JESD22-A114

Comparison Table

SPI/UART to I²C

Part Number UART SPI I²C GPIO Function
SC18IS604 NA 1.2 MHz 375 kHz 5 SPI to I²C
SC18IM704 460.8 Kbit/s NA 375 kHz 8 UART to I²C

I²C to SPI

Part Number UART SPI I²C GPIO Function
SC18IS606 NA 1.8 MHz 400 kHz 3 I²C to SPI

I²C/SPI to UART

Part Number UART SPI I²C GPIO Function
SC16IS740/750/752 5 Mbit/s 15 Mbit/s 400 kHz 8 I²C/SPI to UART

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SC18IM704PW
Data Sheet

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1K @ US$1.34

TSSOP16

16

I2C bus

UART

N true 0 PSPSC18IM704en 4 Data Sheet Data Sheet t520 1 Fact Sheet Fact Sheet t523 1 Selector Guide Selector Guide t528 1 User Guide User Guide t792 1 en_US en_US en Data Sheet Data Sheet 1 1 1.0 English This data sheet helps you learn more about the SC18IM704 and how it is designed to serve as an interface between the standard UART port of a microcontroller or microprocessor and the serial I2C-bus. 1632841951869718004791 PSP 496.8 KB None None documents None 1632841951869718004791 /docs/en/data-sheet/SC18IM704.pdf 496845 /docs/en/data-sheet/SC18IM704.pdf SC18IM704 documents N N 2021-09-28 SC18IM704, UART to I2C-bus bridge - data sheet /docs/en/data-sheet/SC18IM704.pdf /docs/en/data-sheet/SC18IM704.pdf Data Sheet N 980000996212993340 2022-12-07 pdf N en Sep 22, 2021 980000996212993340 Data Sheet Y N SC18IM704, UART to I2C-bus bridge - data sheet User Guide User Guide 1 2 6.0 Japanese 1442125286808710770774ja PSP 751.0 KB None None documents None 1442125286808710770774 /docs/ja/user-guide/UM10204.pdf 750958 /docs/ja/user-guide/UM10204.pdf UM10204 documents N N 2016-07-12 I2C-bus specification and user manual /docs/ja/user-guide/UM10204.pdf /docs/ja/user-guide/UM10204.pdf User Guide N 132339537837198660 2024-10-24 ja Apr 28, 2014 132339537837198660 User Guide Y N I2C-bus specification and user manual 7.0 English NXP Semiconductors developed a simple bidirectional 2-wire bus for efficient inter-IC control. This bus is called the Inter-IC or I2C-bus. Only two bus lines are required: a serial data line (SDA) and a serial clock line (SCL). Serial, 8-bit oriented, bidirectional data transfers can be made at up to 100 kbit/s in the Standard-mode, up to 400 kbit/s in the Fast-mode, up to 1 Mbit/s in the Fast-mode Plus (Fm+), or up to 3.4 Mbit/s in the High-speed mode. 1442125286808710770774 PSP 751.0 KB None None documents None 1442125286808710770774 /docs/en/user-guide/UM10204.pdf 750958 /docs/en/user-guide/UM10204.pdf UM10204 documents N N 2016-07-12 I2C-bus specification and user manual /docs/en/user-guide/UM10204.pdf /docs/en/user-guide/UM10204.pdf User Guide N 132339537837198660 2024-10-24 pdf N en Oct 1, 2021 132339537837198660 User Guide Y N I2C-bus specification and user manual Fact Sheet Fact Sheet 1 3 2 English This Fact Sheet depicts the next generation of NXP bridges and the range that allow conversion between protocols. Products include SC16IS7 , SC18IS604 , SC18IS606 , SC18IM704. 1632425681598702834230 PSP 698.9 KB None None documents None 1632425681598702834230 /docs/en/fact-sheet/NEXTGENBRIDGFS.pdf 698850 /docs/en/fact-sheet/NEXTGENBRIDGFS.pdf NEXTGENBRIDGFS documents N N 2021-09-23 Next Generation Bridges - Fact Sheet /docs/en/fact-sheet/NEXTGENBRIDGFS.pdf /docs/en/fact-sheet/NEXTGENBRIDGFS.pdf Fact Sheet N 736675474163315314 2023-10-17 pdf N en Feb 15, 2023 736675474163315314 Fact Sheet Y N Next Generation Bridges - Fact Sheet Selector Guide Selector Guide 1 4 0 Japanese A broad catalog of interface components for all your design needs 1464843144333730804447ja PSP 1.7 MB None None documents None 1464843144333730804447 /docs/ja/product-selector-guide/I2CSELECTORBROC.pdf 1704771 /docs/ja/product-selector-guide/I2CSELECTORBROC.pdf I2CSELECTORBROC documents N N 2017-07-03 NXP System Management I²C, I3C and SPI Selector Guide /docs/ja/product-selector-guide/I2CSELECTORBROC.pdf /docs/ja/product-selector-guide/I2CSELECTORBROC.pdf Selector Guide N 553557935274807777 2025-03-24 ja Jan 4, 2022 553557935274807777 Selector Guide Y N システム・マネジメントI2C, I3C, SPIセレクタ・ガイド 8 English A broad catalog of interface components for all your design needs. 1464843144333730804447 PSP 1.7 MB None None documents None 1464843144333730804447 /docs/en/product-selector-guide/I2CSELECTORBROC.pdf 1704771 /docs/en/product-selector-guide/I2CSELECTORBROC.pdf I2CSELECTORBROC documents N N 2017-07-03 NXP System Management I²C, I3C and SPI Selector Guide /docs/en/product-selector-guide/I2CSELECTORBROC.pdf /docs/en/product-selector-guide/I2CSELECTORBROC.pdf Selector Guide N 553557935274807777 2025-03-24 pdf N en Mar 21, 2025 updated 553557935274807777 Selector Guide Y N NXP System Management I²C, I3C and SPI Selector Guide false 0 SC18IM704 downloads en true 1 Y PSP Y Y Data Sheet 1 /docs/en/data-sheet/SC18IM704.pdf 2021-09-28 1632841951869718004791 PSP 1 Sep 22, 2021 Data Sheet This data sheet helps you learn more about the SC18IM704 and how it is designed to serve as an interface between the standard UART port of a microcontroller or microprocessor and the serial I2C-bus. None /docs/en/data-sheet/SC18IM704.pdf English documents 496845 None 980000996212993340 2022-12-07 N /docs/en/data-sheet/SC18IM704.pdf SC18IM704, UART to I2C-bus bridge - data sheet /docs/en/data-sheet/SC18IM704.pdf documents 980000996212993340 Data Sheet N en None Y pdf 1.0 N N SC18IM704, UART to I2C-bus bridge - data sheet 496.8 KB SC18IM704 N 1632841951869718004791 Fact Sheet 1 /docs/en/fact-sheet/NEXTGENBRIDGFS.pdf 2021-09-23 1632425681598702834230 PSP 3 Feb 15, 2023 Fact Sheet This Fact Sheet depicts the next generation of NXP bridges and the range that allow conversion between protocols. Products include SC16IS7 , SC18IS604 , SC18IS606 , SC18IM704. None /docs/en/fact-sheet/NEXTGENBRIDGFS.pdf English documents 698850 None 736675474163315314 2023-10-17 N /docs/en/fact-sheet/NEXTGENBRIDGFS.pdf Next Generation Bridges - Fact Sheet /docs/en/fact-sheet/NEXTGENBRIDGFS.pdf documents 736675474163315314 Fact Sheet N en None Y pdf 2 N N Next Generation Bridges - Fact Sheet 698.9 KB NEXTGENBRIDGFS N 1632425681598702834230 Selector Guide 1 /docs/en/product-selector-guide/I2CSELECTORBROC.pdf 2017-07-03 1464843144333730804447 PSP 4 Mar 21, 2025 Selector Guide A broad catalog of interface components for all your design needs. None /docs/en/product-selector-guide/I2CSELECTORBROC.pdf English documents 1704771 None 553557935274807777 2025-03-24 N /docs/en/product-selector-guide/I2CSELECTORBROC.pdf NXP System Management I²C, I3C and SPI Selector Guide /docs/en/product-selector-guide/I2CSELECTORBROC.pdf documents 553557935274807777 Selector Guide N updated en None Y pdf 8 N N NXP System Management I²C, I3C and SPI Selector Guide 1.7 MB I2CSELECTORBROC N 1464843144333730804447 User Guide 1 /docs/en/user-guide/UM10204.pdf 2016-07-12 1442125286808710770774 PSP 2 Oct 1, 2021 User Guide NXP Semiconductors developed a simple bidirectional 2-wire bus for efficient inter-IC control. This bus is called the Inter-IC or I2C-bus. Only two bus lines are required: a serial data line (SDA) and a serial clock line (SCL). Serial, 8-bit oriented, bidirectional data transfers can be made at up to 100 kbit/s in the Standard-mode, up to 400 kbit/s in the Fast-mode, up to 1 Mbit/s in the Fast-mode Plus (Fm+), or up to 3.4 Mbit/s in the High-speed mode. None /docs/en/user-guide/UM10204.pdf English documents 750958 None 132339537837198660 2024-10-24 N /docs/en/user-guide/UM10204.pdf I2C-bus specification and user manual /docs/en/user-guide/UM10204.pdf documents 132339537837198660 User Guide N en None Y pdf 7.0 N N I2C-bus specification and user manual 751.0 KB UM10204 N 1442125286808710770774 true Y Products

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