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How to Use SC16IS752: Examples, Pinouts, and Specs

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Introduction

The SC16IS752, manufactured by NXP, is a dual-channel I2C/SPI to UART bridge designed to facilitate serial communication between microcontrollers and other devices. It provides a high-speed UART interface with configurable baud rates and supports both I2C and SPI protocols, making it a versatile solution for embedded systems. This component is particularly useful in applications requiring multiple UART interfaces but limited microcontroller resources.

Explore Projects Built with SC16IS752

Use Cirkit Designer to design, explore, and prototype these projects online. Some projects support real-time simulation. Click "Open Project" to start designing instantly!
Image of Cellular-Connected ESP32-CAM with Real-Time Clock and Isolated Control: A project utilizing SC16IS752 in a practical application
Cellular-Connected ESP32-CAM with Real-Time Clock and Isolated Control

This circuit integrates a LilyGo-SIM7000G module with an RTC DS3231 for timekeeping, interfaced via I2C (SCL and SDA lines). An 8-Channel OPTO-COUPLER is used to isolate and interface external signals with the LilyGo-SIM7000G's GPIOs. Power is managed by a Buck converter, which steps down voltage from a DC Power Source to supply the ESP32-CAM and LilyGo-SIM7000G modules, as well as the OPTO-COUPLER.

Open Project in Cirkit Designer
Image of Cellular-Enabled IoT Device with Real-Time Clock and Power Management: A project utilizing SC16IS752 in a practical application
Cellular-Enabled IoT Device with Real-Time Clock and Power Management

This circuit features a LilyGo-SIM7000G module for cellular communication and GPS functionality, interfaced with an RTC DS3231 for real-time clock capabilities. It includes voltage sensing through two voltage sensor modules, and uses an 8-channel opto-coupler for isolating different parts of the circuit. Power management is handled by a buck converter connected to a DC power source and batteries, with a fuse for protection and a rocker switch for on/off control. Additionally, there's an LED for indication purposes.

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Common Applications

Technical Specifications

Key Technical Details

Pin Configuration and Descriptions

The SC16IS752 is available in multiple packages. Below is the pin configuration for the TSSOP-28 package:

Pin Number Pin Name Description
1 A0 I2C address selection or SPI chip select (CS)
2 A1 I2C address selection
3 RESET Active-low reset input
4 XTAL1 Crystal oscillator input or external clock input
5 XTAL2 Crystal oscillator output
6 VSS Ground
7 TXD0 UART0 transmit data
8 RXD0 UART0 receive data
9 RTS0 UART0 request to send
10 CTS0 UART0 clear to send
11 TXD1 UART1 transmit data
12 RXD1 UART1 receive data
13 RTS1 UART1 request to send
14 CTS1 UART1 clear to send
15 GPIO0 General-purpose I/O pin
16 GPIO1 General-purpose I/O pin
17 GPIO2 General-purpose I/O pin
18 GPIO3 General-purpose I/O pin
19 GPIO4 General-purpose I/O pin
20 GPIO5 General-purpose I/O pin
21 GPIO6 General-purpose I/O pin
22 GPIO7 General-purpose I/O pin
23 SCL/SCLK I2C clock or SPI clock
24 SDA/MOSI I2C data or SPI master out/slave in
25 MISO SPI master in/slave out
26 IRQ Interrupt request output
27 VCC Power supply input
28 A2 I2C address selection

Usage Instructions

How to Use the SC16IS752 in a Circuit

  1. Power Supply: Connect the VCC pin to a 3.3V power source and the VSS pin to ground.
  2. Communication Protocol Selection:
    • For I2C: Connect the SCL and SDA pins to the I2C bus of the microcontroller. Use A0, A1, and A2 to set the I2C address.
    • For SPI: Connect SCLK, MOSI, MISO, and CS (A0) to the SPI bus of the microcontroller.
  3. UART Connections: Connect the TXD and RXD pins of each UART channel to the corresponding devices.
  4. GPIO Configuration: Use the GPIO pins as needed for additional control or status signals.
  5. Clock Source: Connect a crystal oscillator to XTAL1 and XTAL2, or provide an external clock signal to XTAL1.
  6. Interrupt Handling: Connect the IRQ pin to a microcontroller interrupt pin for efficient event handling.

Important Considerations

Example Code for Arduino UNO (I2C Mode)

#include <Wire.h>

// SC16IS752 I2C address (A0, A1, A2 = 0)
#define SC16IS752_ADDR 0x48

void setup() {
  Wire.begin(); // Initialize I2C communication
  Serial.begin(9600); // Initialize Serial Monitor
  
  // Initialize SC16IS752
  Wire.beginTransmission(SC16IS752_ADDR);
  Wire.write(0x03); // Write to the FCR (FIFO Control Register)
  Wire.write(0x07); // Enable FIFO, clear TX/RX FIFO
  Wire.endTransmission();
  
  Serial.println("SC16IS752 Initialized");
}

void loop() {
  // Example: Send data to UART0
  Wire.beginTransmission(SC16IS752_ADDR);
  Wire.write(0x00); // THR (Transmit Holding Register) for UART0
  Wire.write('H');  // Send character 'H'
  Wire.endTransmission();
  
  delay(1000); // Wait 1 second
}

Troubleshooting and FAQs

Common Issues

  1. No Communication with the SC16IS752:

    • Verify the I2C or SPI connections and ensure the correct protocol is selected.
    • Check the I2C address configuration (A0, A1, A2 pins).
    • Ensure pull-up resistors are present on the I2C lines.

  2. UART Data Loss:

    • Ensure the baud rate and UART settings match between the SC16IS752 and the connected device.
    • Check if the FIFO buffer is full and handle interrupts appropriately.

  3. Interrupts Not Triggering:

    • Verify the IRQ pin is connected to the correct microcontroller interrupt pin.
    • Ensure the interrupt enable registers are configured correctly.

Tips for Troubleshooting