The part number you provided, "INA225AQDGKRQ1", belongs to Texas Instruments. It is a current and Power monitor device. The model "INA225AQDGKRQ1" is part of the INA225 family, which includes precision, low-power analog-to-digital converters (ADCs) that provide high-accuracy measurements for current, voltage, and power monitoring in various applications.
Package Type and Pin Count:
The "AQDGKRQ1" suffix indicates a QFN-16 (Quad Flat No-lead) package with 16 pins. It is designed to be compact, efficient, and reliable, suitable for use in systems requiring precise power management.
Pin Function List:
Here is the detailed list of pin functions for the INA225AQDGKRQ1 in the QFN-16 package:
Pin Number Pin Name Pin Function Description 1 V+ Power supply pin for the INA225 device. Typically connected to a positive voltage source (2.7V to 5.5V). 2 GND Ground pin for the INA225 device. This should be connected to the system ground. 3 SDA Serial Data (SDA) for I²C communication. Used for data transmission between the INA225 and a microcontroller or other I²C master. 4 SCL Serial Clock (SCL) for I²C communication. Provides the clock signal to synchronize data transfer between INA225 and the master device. 5 ALERT Open-drain alert pin. Active low when an alert condition is met, such as exceeding a programmed threshold for current or power. 6 VOUT Voltage output for the power measurement. The voltage across the load can be measured at this pin. 7 IN+ Positive input pin for the voltage measurement. This pin connects to the positive side of the shunt resistor or load. 8 IN- Negative input pin for the voltage measurement. This pin connects to the negative side of the shunt resistor or load. 9 REF Reference voltage input for the internal ADC. A stable voltage reference should be supplied to this pin to ensure accurate conversion. 10 SMBus Alert SMBus alert pin. Similar to the ALERT pin but specifically used in systems with SMBus communication. 11 NC No connection. This pin should be left unconnected. 12 NC No connection. This pin should be left unconnected. 13 NC No connection. This pin should be left unconnected. 14 NC No connection. This pin should be left unconnected. 15 NC No connection. This pin should be left unconnected. 16 NC No connection. This pin should be left unconnected.Circuit Principle and Usage:
The INA225 is designed to measure the voltage across a shunt resistor (used to monitor current) and calculate both current and power. It uses an internal ADC to convert the analog signals to a digital format, which can then be read via I²C or SMBus communication. The INA225 can be used in applications such as power management, battery monitoring, and system monitoring, providing precise measurements even in low-power scenarios.
Frequently Asked Questions (FAQ):
What is the maximum supply voltage for the INA225AQDGKRQ1? The maximum supply voltage for the INA225 is 5.5V. Can I use the INA225AQDGKRQ1 for high-current measurements? No, the INA225 is designed for low to medium current measurements. The maximum current is determined by the value of the external shunt resistor. How do I connect the INA225AQDGKRQ1 to a microcontroller? The INA225 can be connected via I²C (SDA and SCL pins) to the microcontroller for communication. Make sure to connect the GND pin to the ground of the microcontroller. What should I do if the ALERT pin is activated? When the ALERT pin is active, it indicates that a threshold has been exceeded (e.g., overcurrent or overvoltage). You can use this to trigger an interrupt or take corrective action in the system. Can the INA225AQDGKRQ1 measure both current and power? Yes, the INA225 can measure both current (via the shunt resistor) and power (based on the voltage and current readings). What is the default I²C address of the INA225AQDGKRQ1? The default I²C address for the INA225 is 0x40, but it can be changed by modifying the address configuration in the register settings. How accurate is the current measurement with the INA225? The INA225 offers a high-accuracy current measurement, with a typical resolution of 0.5% of the full-scale value, depending on the configuration. Is there any need for an external reference voltage? Yes, the INA225 requires an external reference voltage for accurate measurement. This is typically supplied through the REF pin. What is the power consumption of the INA225? The INA225 is designed to be low power, consuming less than 1mA in typical operating conditions.Can I connect the INA225AQDGKRQ1 directly to a 3.3V system?
Yes, the INA225 is compatible with 3.3V systems, as long as the supply voltage is between 2.7V and 5.5V.Can the ALERT pin be used for multiple threshold conditions?
Yes, the ALERT pin can be configured to trigger based on various conditions, such as overcurrent or overvoltage.What is the maximum input voltage for the INA225?
The INA225 can handle input voltages up to 40V on the IN+ and IN- pins, depending on the external shunt resistor value.Can I use the INA225AQDGKRQ1 for bidirectional current measurement?
Yes, the INA225 can measure both positive and negative current by monitoring the voltage across the shunt resistor.What is the operating temperature range of the INA225AQDGKRQ1?
The INA225 operates in a temperature range from -40°C to 125°C.How do I calibrate the INA225AQDGKRQ1?
The INA225 comes pre-calibrated from the factory, but if necessary, you can adjust the calibration settings in the register map for specific use cases.What is the output resolution of the INA225AQDGKRQ1?
The INA225 provides a 16-bit resolution for both current and power measurements.Can the INA225 be used in automotive applications?
Yes, the INA225AQDGKRQ1 is part of the Q1 series, which is designed and qualified for automotive use.What is the maximum data rate for the I²C interface ?
The maximum data rate for the I²C interface is 400 kHz (Fast Mode).Is the INA225AQDGKRQ1 compatible with other communication protocols?
The INA225 primarily supports I²C and SMBus protocols, and is not compatible with other protocols like SPI.How do I read data from the INA225AQDGKRQ1?
To read data, communicate with the INA225 over I²C, requesting data from the measurement registers that store the current and power values.This list provides a comprehensive look at the INA225AQDGKRQ1 device's pin functions, application in a circuit, and answers to frequently asked questions. Let me know if you'd like further details!