How to Use ADUM150N1BRZ: Examples, Pinouts, and Specs

The ADUM150N1BRZ is a digital isolator manufactured by Analog Devices. It provides galvanic isolation between two circuits, enabling safe data transfer while protecting sensitive low-voltage components from high-voltage surges. This component uses Analog Devices' iCoupler® technology, which ensures high-speed data transmission with low power consumption.

• Industrial Automation: Isolating control systems from high-voltage machinery.
• Medical Devices: Ensuring patient safety by isolating sensitive electronics.
• Communication Systems: Protecting data lines in noisy or high-voltage environments.
• Power Supplies: Isolating feedback loops in switched-mode power supplies (SMPS).

The following table outlines the key technical details of the ADUM150N1BRZ:

The ADUM150N1BRZ is an 8-pin device. The pin configuration and descriptions are as follows:

1. Power Supply: Connect VDD1 and VDD2 to separate power supplies (3.0 V to 5.5 V). Ensure that GND1 and GND2 are isolated from each other to maintain galvanic isolation.
2. Data Input/Output: Connect the data signals to the IN1 and IN2 pins on the input side. The corresponding outputs will appear on OUT1 and OUT2 on the isolated side.
3. Bypass Capacitors: Place decoupling capacitors (e.g., 0.1 µF) close to the VDD1 and VDD2 pins to reduce noise and ensure stable operation.
4. PCB Layout: Maintain sufficient spacing between the high-voltage and low-voltage sides to prevent arcing or breakdown.

• Isolation Voltage: Do not exceed the rated isolation voltage of 3 kV RMS.
• Data Rate: Ensure that the data rate does not exceed 10 Mbps for reliable operation.
• Thermal Management: Operate the device within the specified temperature range (-40°C to +125°C) to avoid thermal damage.
• Signal Integrity: Use short and direct traces for data lines to minimize signal degradation.

The ADUM150N1BRZ can be used to isolate an Arduino UNO from a high-voltage circuit. Below is an example of how to connect and program the device:

• Connect VDD1 to the Arduino's 5V pin and GND1 to the Arduino's GND pin.
• Connect IN1 to a digital output pin on the Arduino (e.g., D2).
• Connect VDD2 to the high-voltage circuit's power supply and GND2 to its ground.
• OUT1 will output the isolated signal to the high-voltage circuit.

// Example code to send a digital signal through the ADUM150N1BRZ
const int signalPin = 2; // Pin connected to IN1 of ADUM150N1BRZ

void setup() {
  pinMode(signalPin, OUTPUT); // Set the signal pin as an output
}

void loop() {
  digitalWrite(signalPin, HIGH); // Send a HIGH signal
  delay(1000); // Wait for 1 second
  digitalWrite(signalPin, LOW);  // Send a LOW signal
  delay(1000); // Wait for 1 second
}

1. No Output Signal on OUT1/OUT2:

   • Cause: Missing or incorrect power supply connections.
   • Solution: Verify that VDD1 and VDD2 are powered correctly and that GND1 and GND2 are isolated.

2. Signal Distortion or Noise:

   • Cause: Poor PCB layout or missing decoupling capacitors.
   • Solution: Add 0.1 µF decoupling capacitors close to VDD1 and VDD2. Ensure short and direct traces for data lines.

3. Device Overheating:

   • Cause: Operating outside the specified voltage or temperature range.
   • Solution: Check the supply voltage and ambient temperature. Ensure they are within the specified limits.

4. Isolation Breakdown:

   • Cause: Exceeding the rated isolation voltage.
   • Solution: Ensure that the voltage difference between GND1 and GND2 does not exceed 3 kV RMS.

Q1: Can the ADUM150N1BRZ be used for bidirectional communication?
A1: No, the ADUM150N1BRZ is designed for unidirectional data transfer. For bidirectional communication, consider using other isolators from Analog Devices that support bidirectional operation.

Q2: What is the maximum distance between the isolated sides?
A2: The maximum distance is determined by the PCB layout and the isolation voltage rating. Ensure sufficient spacing to maintain isolation integrity.

Q3: Can I use the ADUM150N1BRZ with a 3.3 V system?
A3: Yes, the ADUM150N1BRZ supports supply voltages from 3.0 V to 5.5 V, making it compatible with 3.3 V systems.