Overview
The INA219AIDCNTG4, produced by Texas Instruments, is a highly accurate and versatile current shunt and power monitor. This device features an I2C- or SMBUS-compatible interface, making it suitable for a wide range of applications. The INA219 monitors both the shunt voltage drop and the bus supply voltage, providing direct readouts of current in amperes and power in watts through programmable calibration and internal multipliers. Available in two grades (A and B), the B grade version offers higher accuracy and precision specifications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SOT23-8 | |
| Pins | 8 | |
| Operating Temperature Range | -40 to 125 | °C |
| Supply Voltage | 3 to 5.5 | V |
| Maximum Supply Current | 1 | mA |
| Bus Voltage Range | 0 to 26 | V |
| Full-Scale Shunt Voltage Range | ±40 mV to ±320 mV (PGA dependent) | mV |
| Accuracy (INA219B) | 0.5% (Maximum) over temperature | |
| Programmable Addresses | 16 |
Key Features
- Senses bus voltages from 0 to 26 V
- Reports current, voltage, and power
- 16 programmable addresses for I2C or SMBUS interface
- High accuracy: 0.5% (maximum) over temperature for INA219B
- Filtering options and programmable averaging of up to 128 samples
- Programmable calibration register for direct reading of current in amperes and power in watts
- PGA function to increase full-scale shunt voltage range
- Compatibility with TI hot swap controllers like TPS2490
- Operates from a single 3 to 5.5 V supply, drawing a maximum of 1 mA
Applications
- Servers
- Notebook computers
- Power supplies
- Battery management systems
- Automotive and telecom equipment
Q & A
- What is the primary function of the INA219?
The INA219 is a current shunt and power monitor that senses both shunt voltage drop and bus supply voltage, providing direct readouts of current and power.
- What are the available package types for the INA219?
The INA219 is available in SOT23-8 and SOIC-8 packages.
- What is the operating temperature range of the INA219?
The INA219 operates from -40°C to 125°C.
- How many programmable addresses does the INA219 have?
The INA219 has 16 programmable addresses for its I2C or SMBUS interface.
- What is the maximum supply current of the INA219?
The INA219 draws a maximum of 1 mA of supply current.
- Can the INA219 be used with hot swap controllers?
Yes, the INA219 is designed for compatibility with hot swap controllers like the TI TPS2490.
- What is the bus voltage range that the INA219 can sense?
The INA219 can sense bus voltages from 0 to 26 V.
- Does the INA219 support filtering and averaging?
Yes, the INA219 offers filtering options and programmable averaging of up to 128 samples.
- How accurate is the INA219B grade version?
The INA219B grade version has a maximum accuracy of 0.5% over temperature.
- What is the purpose of the PGA function in the INA219?
The PGA function increases the full-scale shunt voltage range up to 2, 4, or 8 times.
