INA213AIDCKR Detailed explanation of pin function specifications and circuit principle instructions

The INA213AIDCKR is a specific integrated circuit (IC) produced by Texas Instruments. It is a current-sensing amplifier that provides accurate and high-side current measurement.

Package Information

The "INA213AIDCKR" part number corresponds to a QFN (Quad Flat No-lead) package. The specific package type for this part is the VQFN-10 (10-pin), and the IC is designed for high-precision current sensing.

Pin Function Specifications and Circuit Principle

The INA213AIDCKR comes in a 10-pin package, and each pin has specific functions for proper operation. Below is the detailed breakdown of all the pins:

Pin Number Pin Name Function Description 1 V+ ( Power Supply) This pin is the positive power supply input for the device. Connect this pin to the positive voltage supply (up to 26V). 2 V- (Ground) This pin is the ground (or negative) input for the device. It should be connected to the system ground. 3 IN+ (Input+) The positive input for the differential current sensing input. Connect this pin to the current-sensing resistor. 4 IN- (Input-) The negative input for the differential current sensing input. Connect this pin to the current-sensing resistor. 5 SDA (Data) This pin is used for I2C data communication. It is part of the I2C interface for reading and writing to the device. 6 SCL ( Clock ) This pin is used for I2C clock communication. It is part of the I2C interface for reading and writing to the device. 7 ALERT This pin is used to signal an alert condition. The ALERT pin goes low when the device detects a current threshold is crossed. 8 A0 (Address Pin) This pin is used to set the I2C address of the device. Connect this pin to ground or VCC to change the I2C address. 9 VREF (Reference) This pin sets the reference voltage used for analog-to-digital conversion. Typically, this is connected to a precision reference voltage. 10 NC (No Connection) This pin is not connected to anything internally and should be left floating or unconnected.

Detailed Explanation of Pin Functions

V+ (Power Supply Pin): This pin supplies the necessary voltage to power the INA213AIDCKR. It needs to be connected to a voltage source between 2.7V to 26V for the device to function.

V- (Ground Pin): The ground pin should be connected to the system’s ground reference. It serves as the return path for the device’s power and signals.

IN+ (Positive Input Pin): This is the positive input of the current-sensing circuit. It is connected to the load or side of the circuit where current flows through the sensing resistor to detect current. The voltage difference between IN+ and IN- is measured to determine the current.

IN- (Negative Input Pin): This is the negative input for current measurement. It should be connected to the other side of the current-sensing resistor to allow differential current measurement.

SDA (Data Pin): The I2C data line for serial communication. It is used to transmit the data between the INA213AIDCKR and the microcontroller or other controlling device.

SCL (Clock Pin): The I2C clock line, used for synchronization of the communication between the device and the controlling system. It works together with the SDA pin.

ALERT (Alert Pin): When a fault condition (such as overcurrent) is detected, this pin will go low to signal an alert. It can be used to trigger actions like turning off the power or generating an interrupt in the controlling system.

A0 (Address Pin): This pin is used to select the I2C address of the device. By connecting this pin to either VCC or GND, users can choose between different I2C addresses.

VREF (Reference Pin): This pin is used to set the voltage reference for the analog-to-digital conversion within the device. The quality of the reference voltage can affect the accuracy of the current measurement.

NC (No Connection Pin): This pin is not connected internally, so it can be left floating. It has no function in the circuit design.

Circuit Principle

The INA213AIDCKR works by measuring the differential voltage across a current sensing resistor placed in series with the load. By applying Ohm's Law (V = IR), the INA213 calculates the current and then uses an internal analog-to-digital converter (ADC) to convert the voltage difference to a digital signal. This signal is communicated via the I2C interface to the microcontroller or other monitoring systems.

Common FAQs (Frequently Asked Questions)

Q1: What is the maximum supply voltage for the INA213AIDCKR? A1: The maximum supply voltage (V+) for the INA213AIDCKR is 26V.

Q2: What is the communication protocol used by the INA213AIDCKR? A2: The INA213AIDCKR uses the I2C protocol for communication.

Q3: How many pins are available on the INA213AIDCKR? A3: The INA213AIDCKR has a total of 10 pins in the VQFN-10 package.

Q4: What is the purpose of the ALERT pin? A4: The ALERT pin signals an alert condition, such as an overcurrent or threshold crossing.

Q5: Can I use the INA213AIDCKR for low-side current sensing? A5: No, the INA213AIDCKR is designed for high-side current sensing, meaning it should be placed between the power supply and the load.

Q6: How does the INA213AIDCKR communicate with a microcontroller? A6: It uses the I2C interface, where SDA is used for data transmission, and SCL is used for clock synchronization.

Q7: What is the function of the VREF pin? A7: The VREF pin is used to set the reference voltage for the device’s analog-to-digital conversion.

Q8: How do I select the I2C address of the INA213AIDCKR? A8: You can select the I2C address by connecting the A0 pin to either ground or VCC.

Q9: What is the operating voltage range for the INA213AIDCKR? A9: The INA213AIDCKR operates within a voltage range of 2.7V to 26V.

Q10: What is the resolution of the ADC in the INA213AIDCKR? A10: The INA213AIDCKR features a 16-bit ADC, which provides high-resolution measurements of current.

Q11: How accurate is the current sensing of the INA213AIDCKR? A11: The INA213AIDCKR offers an accuracy of ±0.5% for current measurements.

Q12: Can the ALERT pin be used to interrupt a microcontroller? A12: Yes, the ALERT pin can be used as an interrupt to signal an overcurrent or other alert condition.

Q13: Is the INA213AIDCKR capable of measuring bidirectional current? A13: Yes, the INA213AIDCKR can measure both positive and negative (bidirectional) current.

Q14: What is the response time of the INA213AIDCKR for current measurement? A14: The response time of the INA213AIDCKR is typically 100 µs.

Q15: Can I use the INA213AIDCKR with a voltage reference other than the internal reference? A15: Yes, you can provide an external reference voltage to the VREF pin for improved accuracy.

Q16: What is the typical power consumption of the INA213AIDCKR? A16: The INA213AIDCKR typically consumes less than 1mA of current when idle.

Q17: What is the function of the NC (No Connection) pin? A17: The NC pin has no internal connection and should be left unconnected.

Q18: Can I cascade multiple INA213AIDCKRs on the same I2C bus? A18: Yes, as long as each device has a unique I2C address, multiple INA213AIDCKRs can be connected to the same I2C bus.

Q19: How does the INA213AIDCKR handle overcurrent conditions? A19: When an overcurrent condition is detected, the ALERT pin is pulled low to signal the fault condition.

Q20: What is the recommended temperature range for operating the INA213AIDCKR? A20: The recommended operating temperature range for the INA213AIDCKR is from -40°C to +125°C.

This explanation covers the pin functions and frequently asked questions, providing a complete understanding of the INA213AIDCKR device.