INA219 Zerø-Drift, Bidirectional Current/Power Monitor With I2C Interface
1 Features
2 Applications
- Servers
- Telecom Equipment
- Notebook Computers
- Power Management
- Battery Chargers
- Welding Equipment
- Power Supplies
- Test Equipment
3 Description
The INA219 is a current shunt and power monitor with an I2C- or SMBUS-compatible interface. The device monitors both shunt voltage drop and bus supply voltage, with programmable conversion times and filtering. A programmable calibration value, combined with an internal multiplier, enables direct readouts of current in amperes. An additional multiplying register calculates power in watts. The I2C- or SMBUS-compatible interface features 16 programmable addresses.
The INA219 is available in two grades: A and B. The B grade version has higher accuracy and higher precision specifications.
The INA219 senses across shunts on buses that can vary from 0 to 26 V. The device uses a single 3- to 5.5-V supply, drawing a maximum of 1 mA of supply current. The INA219 operates from –40°C to 125°C.
Device Information(1)
| PART NUMBER | PACKAGE | BODY SIZE (NOM) |
|---|---|---|
| INA219 | SOIC (8) | 3.91 mm × 4.90 mm |
| SOT-23 (8) | 1.63 mm × 2.90 mm |
- For all available packages, see the orderable addendum at the end of the data sheet.
Simplified Schematic
4 Revision History
Changes from F Revision (September 2011) to G Revision
- Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section Go
- Updated Bus Timing Diagram Definitions table. I2C timing table values were previously based on simulation and not characterizedGo
Changes from E Revision (September 2010) to F Revision
Changes from D Revision (September 2010) to E Revision
- Updated Packaging Information tableGo
6 Pin Configuration and Functions
Pin Functions
| PIN | I/O | DESCRIPTION | ||
|---|---|---|---|---|
| NAME | SOT-23 | SOIC | ||
| IN+ | 1 | 8 | Analog Input | Positive differential shunt voltage. Connect to positive side of shunt resistor. |
| IN– | 2 | 7 | Analog Input | Negative differential shunt voltage. Connect to negative side of shunt resistor. Bus voltage is measured from this pin to ground. |
| GND | 3 | 6 | Analog | Ground |
| VS | 4 | 5 | Analog | Power supply, 3 to 5.5 V |
| SCL | 5 | 4 | Digital Input | Serial bus clock line |
| SDA | 6 | 3 | Digital I/O | Serial bus data line |
| A0 | 7 | 2 | Digital Input | Address pin. Table 1 shows pin settings and corresponding addresses. |
| A1 | 8 | 1 | Digital Input | Address pin. Table 1 shows pin settings and corresponding addresses. |
