SN75C3232EDBR Integrated Circuits (ICs)

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SN75C3232, referred as SNxC323x devices, are a series of low-voltage, full-duplex, I2C isolators in the Texas Instruments portfolio. This brand is well-known and received positive responses, being suitable for applications such as those across lightning protected or powered isolated data buses, industrial automation and medical equipment. This article aims to discuss the applications field and working principle of SN75C3232EDB.

Application Field of SN75C3232EDBR

SN75C3232EDBR is a device from the SNxC323x family of I2C isolators which has a maximum data rate of 400 Kbits/s and a maximum voltage supply of 3.3 V. Broadly speaking, the following are the benefits and application areas of SN75C3232EDBR:

Wide Operating Voltage Range: As most signal isolation applications tend to operate on the 3.3V power rails, the input and output signals of SN75C3232EDBR can tolerate between 1.8V and 5.5V.

Low Power Consumption: The low-power characteristic of the device draws 12 mA of supply current at 3.3V with a minimum output delay of 0.65 µs.

Device Performance: This device is capable of providing a data rate of 400 Kbits/sec with a standard I2C bus, making it suitable for applications such as instrumentation, industrial automation or medical equipment.

Simple Design: The quasi-bidirectional isolator does not require external clocking or enable signals, thereby making the design simpler.

The SN75C3232EDBR device can be used in a wide range of electrical equipment, such as temperature and pressure sensors, communication systems, data acquisition systems, analog-to-digital converters, process control systems and motor control systems. Additionally, the device can be used in a wide variety of safety-critical and mission-critical applications in the automotive, industrial, and medical fields.

Working Principle of SN75C3232EDBR

The SN75C3232EDBR is a bidirectional I2C isolator with two signal channels: the driver and the receiver. Each channel has its own separate and distinct signal and power pathways. The transmitter (or driver) is responsible for translating the signal received from the control side, while the receiver is responsible for translating the signal received from the device side. The transmitter and receiver are connected by an isolation barrier, which is designed to prevent transients and common mode noise from travelling from one side to the other.

The transmitter and receiver operate in conjunction to provide an isolated I2C port. The driver of the SN75C3232EDBR is an open-drain output driver. When the device is enabled, it will drive the I2C bus low but will not drive it high. This is important for noise immunity, as it allows for other I2C devices on the bus to be the ones driving the I2C bus line high. The receiver of the SN75C3232EDBR is an open-collector input, which is enabled when the device is enabled and disabled when the device is disabled

The SN75C3232EDBR device is also provided with several protection features, such as reverse-voltage protection and transient suppression. The former ensures that the device is not damaged if there is a failure in the power source, and the latter helps to suppress high-voltage spikes that may otherwise damage the device. The device is also provided with a variety of options for clock stretching, allowing for different operating speeds on the I2C bus. Additionally, the device can operate at either 3.3V or 5V power, which increases the flexibility of the device.

Conclusion

This article provided an overview of the SN75C3232EDBR device and its application field and working principle. The SN75C3232EDBR is a device from the SNxC323x family of I2C isolators which has a wide operating voltage range, low power consumption and simple design, making it suitable for applications such as instrumentation, industrial automation or medical equipment. The SN75C3232EDBR has two signal channels: the driver and the receiver, which are connected by an isolation barrier. In addition, the device is provided with protection features such as reverse-voltage protection and transient suppression, and can operate at either 3.3V or 5V power.

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