UART to I²C-Bus Bridge
SC18IM704 Receive alerts
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.
Product Details
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
Product Longevity Program
- This product is included in the NXP Product Longevity Program ensuring a stable supply of products for your embedded designs. The SC18IM704PW is included in the 10-year program."
Part numbers include: SC18IM704PW.
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 |
Documentation
Quick reference to our documentation types.
4 documents
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User Guide
I2C-bus specification and user manual
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Fact Sheet
Next Generation Bridges - Fact Sheet
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Selector Guide
NXP System Management I2C, I3C and SPI Selector Guide