The INA240A2PWR is a product of Texas Instruments (TI). It is a high-precision current shunt monitor designed for measuring current in various systems. Let's break down the information as requested:
Package Type:
INA240A2PWR comes in a TSSOP-14 (Thin Shrink Small Outline Package) format, which is a 14-pin package.Pin Function Description (14-Pin Package):
Below is the detailed pinout of the INA240A2PWR in a TSSOP-14 package, including all 14 pins and their respective functions.
Pin Number Pin Name Pin Function Description 1 V+ Power supply pin (Positive voltage supply). This pin is connected to the positive power source of the circuit to power the INA240A2PWR. It typically operates with voltages from 2.7V to 5.5V. 2 V- Negative supply pin. It connects to the negative rail or ground in the system. 3 REF Reference pin. This pin is used to set the reference voltage for the device and establish a ground reference for voltage and current measurement. This is typically tied to the ground reference. 4 A0 (Analog Input) Analog input for the voltage measurement (positive input terminal). It is where the voltage is input that will be measured for current sensing purposes. 5 A1 (Analog Input) Analog input for the voltage measurement (negative input terminal). This pin is used to provide the complementary voltage to A0. The differential voltage across A0 and A1 is used for current measurement. 6 SCL Serial Clock Line for I2C communication. Used for controlling the data transfer rate between the INA240A2PWR and the controller. 7 SDA Serial Data Line for I2C communication. This is used to transfer the data between the INA240A2PWR and the controller in a serial format. 8 ALERT Alert output pin. When an overcurrent condition or other faults are detected, this pin can be used to trigger an external circuit or microcontroller. 9 GND Ground pin. Connects to the system's ground to complete the electrical circuit. 10 OUT Analog output pin. This is where the voltage signal representing the measured current is output. The voltage is typically proportional to the current passing through the shunt. 11 VIN+ Positive input pin for voltage measurements. This pin measures the input voltage across the shunt resistor, which will be used to determine the current flowing. 12 VIN- Negative input pin for voltage measurements. Similar to VIN+, but for the negative side of the differential voltage across the current sensing shunt. 13 VREF Voltage Reference pin. This pin is used to connect to a reference voltage to set the measurement range for the device. 14 NC No Connect pin. This pin is not internally connected to any part of the device and is typically left floating or unconnected in a system design.Circuit Principle:
The INA240A2PWR is based on the principle of differential voltage sensing across a shunt resistor to measure the current. The key steps in its operation are as follows:
The current flowing through a system also flows through the shunt resistor. The differential voltage across the shunt resistor is measured by the INA240A2PWR through pins A0 and A1. The device uses the voltage difference (V=IR) to calculate the current, using a precise gain factor. The result is output as an analog signal on OUT or can be transmitted digitally over the I2C interface (pins SDA and SCL). The device also includes ALERT for fault conditions such as overcurrent or undercurrent situations.FAQs (Frequently Asked Questions) for INA240A2PWR:
What is the INA240A2PWR used for? The INA240A2PWR is a high-precision current shunt monitor designed for accurately measuring current in systems with high precision, such as power management circuits, battery monitoring, and motor control.
What is the maximum voltage range of the INA240A2PWR? The INA240A2PWR operates with a voltage range from 2.7V to 5.5V for its supply voltage (V+ to V-).
How does the INA240A2PWR measure current? It measures the differential voltage across a shunt resistor placed in series with the load and uses Ohm’s Law (V=IR) to calculate the current.
What is the significance of the REF pin? The REF pin is used to set the reference voltage for the device, establishing the ground reference for voltage measurements.
Can the INA240A2PWR communicate with a microcontroller? Yes, the INA240A2PWR supports I2C communication via the SDA (Serial Data) and SCL (Serial Clock) pins for data transfer to and from a microcontroller.
What is the ALERT pin for? The ALERT pin can be used to indicate fault conditions such as overcurrent or undercurrent. It is an open-drain output and requires an external pull-up resistor.
What is the output voltage range of the INA240A2PWR? The output voltage (OUT pin) is typically proportional to the measured current, and the voltage can be read directly by an analog-to-digital converter (ADC).
Can the INA240A2PWR measure both AC and DC currents? Yes, the INA240A2PWR can measure both AC and DC currents as long as the signal is within the input voltage range.
What kind of package is the INA240A2PWR available in? The INA240A2PWR comes in a TSSOP-14 package, which is a 14-pin thin shrink small outline package.
How is the voltage reference (VREF) applied to the INA240A2PWR? The VREF pin is used to apply a reference voltage that sets the range for the current measurement. It is typically tied to ground in many applications.
What are the operating temperature ranges for the INA240A2PWR? The INA240A2PWR typically operates in the range of -40°C to +125°C.
What is the accuracy of the INA240A2PWR? The INA240A2PWR provides high-accuracy current sensing with precision up to 0.2%, depending on the configuration and application.
How do I connect the INA240A2PWR to a load for current measurement? The INA240A2PWR is typically connected in series with the load, with the shunt resistor between the input terminals (pins A0 and A1) for current measurement.
What is the gain of the INA240A2PWR? The gain of the INA240A2PWR is set to a fixed factor that depends on the voltage range and the selected reference. For example, at certain voltage settings, the output voltage may directly correlate to a specific current.
How is the power supply connected? The power supply is connected to the V+ and V- pins. V+ connects to the positive supply voltage, and V- connects to the system ground.
Can the INA240A2PWR be used for high-voltage applications? While it can measure high currents, the INA240A2PWR is limited by its voltage supply range of 2.7V to 5.5V. For higher voltage applications, the system may require voltage scaling techniques.
What should be done if the ALERT pin goes high? If the ALERT pin goes high, it indicates a fault condition (like overcurrent or other system issues). Check the load and circuit for possible issues.
Can I use the INA240A2PWR for motor current measurement? Yes, the INA240A2PWR is suitable for monitoring current in motors and other inductive loads, as it provides high-accuracy readings over a wide range of currents.
What is the role of the VIN+ and VIN- pins? These pins are used to measure the differential voltage across the shunt resistor to determine the current.
How does the INA240A2PWR output current data? The INA240A2PWR can output current data either as an analog voltage on the OUT pin or through I2C communication using the SDA and SCL pins.
