The part number "INA240A1QPWRQ1" is a precision current sense amplifier manufactured by Texas Instruments (TI). The INA240 series provides a highly accurate and low-side current sensing solution, suitable for a variety of applications such as power management and energy metering.
Package Type:
The INA240A1QPWRQ1 comes in a VQFN-16 (Very Thin Quad Flat No-lead) package. This package has 16 pins in total, and it is commonly used for precision analog ICs, offering small footprint and excellent thermal performance.
Pin Function Specifications and Circuit Principles:
Below is a detailed explanation of the 16-pin functions and their usage:
Pin Number Pin Name Pin Function Description 1 V+ Positive power supply pin for the device. Connect to the positive voltage rail. 2 V- Negative power supply pin (ground) for the device. Connect to ground. 3 OUT Output voltage, provides the scaled version of the sense voltage for measurement. 4 GND Ground reference for the device. Should be connected to the system ground. 5 SENSE+ Positive sense input for the current being measured. Connected to the high-side of the sense resistor. 6 SENSE- Negative sense input for current measurement. Connected to the low-side of the sense resistor. 7 REF+ Reference input (positive). Typically used for input voltage range configuration. 8 REF- Reference input (negative). Sets the voltage reference for the measurement. 9 ALERT Alert output, typically used for signaling overcurrent conditions. Can be used for interrupt handling. 10 SCL I2C clock input pin for communication with microcontrollers or processors. 11 SDA I2C data input/output for communication with microcontrollers. 12 ADDR Address selection pin for I2C communication. Used to configure the device address. 13 NC No connection. This pin is unused and should be left floating or connected to ground. 14 NC No connection. This pin is unused and should be left floating or connected to ground. 15 VOUT Voltage output pin for a digital-to-analog signal (if applicable). Often tied to an ADC input for monitoring. 16 SHDN Shutdown pin, used to enable or disable the device. When grounded, the device enters shutdown mode to reduce power consumption.Circuit Principle:
The INA240A1QPWRQ1 is designed for highly accurate current sensing. It works by measuring the voltage across a shunt resistor placed in series with the load whose current you want to measure. The device amplifies this small differential voltage, which is then output through the OUT pin.
FAQ (Frequently Asked Questions):
Q1: What is the operating voltage range for INA240A1QPWRQ1?
A1: The INA240A1QPWRQ1 operates within a supply voltage range from 2.7V to 5.5V.Q2: Can I use INA240A1QPWRQ1 for both low-side and high-side current sensing?
A2: Yes, the INA240A1QPWRQ1 is designed for low-side current sensing.Q3: What is the purpose of the ALERT pin in the INA240A1QPWRQ1?
A3: The ALERT pin provides an indication when the current exceeds a predefined threshold, typically used to trigger an interrupt or other responses.Q4: How do I configure the address for I2C communication on INA240A1QPWRQ1?
A4: The ADDR pin is used to set the I2C address. You can set the address by grounding or providing voltage to this pin.Q5: What is the function of the REF+ and REF- pins?
A5: The REF+ and REF- pins are used to set the voltage reference for the internal circuitry, enabling precise voltage measurements.Q6: What happens if the SHDN pin is grounded?
A6: When the SHDN pin is grounded, the device enters shutdown mode to reduce power consumption.Q7: What is the output voltage range from the OUT pin?
A7: The output voltage range from the OUT pin corresponds to the scaled sense voltage and can range from 0V to V+.Q8: How is the INA240A1QPWRQ1 protected from overcurrent conditions?
A8: The device includes internal overcurrent protection and can signal overcurrent events through the ALERT pin.Q9: What is the minimum and maximum sense resistor value for INA240A1QPWRQ1?
A9: The sense resistor value should be selected based on the current measurement range, typically from a few milliohms to tens of milliohms.Q10: Can I connect the INA240A1QPWRQ1 to a microcontroller directly?
A10: Yes, the device’s I2C interface allows for direct communication with a microcontroller.Q11: What is the significance of the V+ and V- pins?
A11: The V+ pin is the positive supply voltage for the device, and V- is the ground or negative reference pin.Q12: How do I use the SCL and SDA pins for I2C communication?
A12: The SCL pin is for the I2C clock signal, and the SDA pin is for bidirectional data transfer in I2C communication.Q13: What does the NC (no connection) pin mean?
A13: The NC pin has no function and should be left unconnected or tied to ground.Q14: How does the INA240A1QPWRQ1 handle differential voltage measurements?
A14: The device measures the differential voltage between SENSE+ and SENSE-, amplifying it for accurate current measurement.Q15: What is the maximum input voltage that can be applied to the SENSE+ and SENSE- pins?
A15: The maximum voltage between SENSE+ and SENSE- pins should be within the device's input common-mode voltage range, typically up to the supply voltage.Q16: Can the INA240A1QPWRQ1 be used in automotive applications?
A16: Yes, the INA240A1QPWRQ1 is qualified for automotive applications under the AEC-Q100 standard.Q17: Can the ALERT pin be used for multiple devices in a system?
A17: Yes, the ALERT pin can be connected to multiple devices, but care must be taken to ensure proper signal handling.Q18: What is the significance of the VOUT pin?
A18: The VOUT pin provides an analog output that represents the measured voltage, which can be monitored by an ADC.Q19: How do I ensure accurate measurement using INA240A1QPWRQ1?
A19: Ensure that the sense resistor is chosen correctly and that the device is powered within its specified voltage range for optimal performance.Q20: Can I use INA240A1QPWRQ1 in a low-power design?
A20: Yes, the INA240A1QPWRQ1 has low power consumption, especially when the SHDN pin is used to disable the device when not needed.This explanation provides the requested detailed information about the INA240A1QPWRQ1, its pin functions, usage instructions, and frequently asked questions.