INA226-Q1
16-Bit I2C Current, Voltage, and Power MonitorThe INA226-Q1 is a 16-bit i2c current, voltage, and power monitor from Texas Instruments. View the full INA226-Q1 datasheet below including electrical characteristics, absolute maximum ratings.
Manufacturer
Texas Instruments
Category
Interface ICsOverview
Part: Texas Instruments INA226
Type: Current Shunt and Power Monitor
Description: The INA226 is a 36V, 16-bit, ultra-precise current shunt and power monitor with an I2C/SMBus-compatible interface, featuring 0.1% maximum gain error and 10μV maximum offset.
Operating Conditions:
- Supply voltage: 2.7V to 5.5V
- Operating temperature: -40 to 125 °C
- Bus voltage sensing range: 0V to 36V
- Programmable addresses: Up to 16
Absolute Maximum Ratings:
- Max supply voltage: 6 V
- Max junction/storage temperature: 150 °C
Key Specs:
- Shunt voltage input range: -81.9175 mV to 81.92 mV
- Bus voltage input range: 0 V to 36 V
- Shunt offset voltage, RTI: ±10 μV (maximum)
- Shunt voltage gain error: 0.1% (maximum)
- Bus voltage gain error: 0.1% (maximum)
- ADC native resolution: 16 Bits (Shunt voltage)
- Quiescent current: 330 μA (typical)
- Quiescent current, power-down: 0.5 μA (typical)
Features:
- Senses bus voltages from 0V to 36V
- High-side or low-side sensing
- Reports current, voltage, and power
- High accuracy: Gain error: 0.1% (maximum), Offset: 10μV (maximum)
- Configurable averaging options
- 16 programmable addresses
- Operates from 2.7V to 5.5V power supply
- 10-pin DGS (VSSOP) package
Applications:
- Rack servers
- Wireless infrastructure
- High performance computing
- Power management
- Battery cell monitors and balancers
- Power Supplies
- Test Equipment
Package:
- VSSOP (10) (3.00mm × 4.90mm)
Features
- Senses bus voltages from 0V to 36V
- High-side or low-side sensing
- Reports current, voltage, and power
- High accuracy:
- -Gain error: 0.1% (maximum)
- -Offset: 10μV (maximum)
- Configurable averaging options
- 16 programmable addresses
- Operates from 2.7V to 5.5V power supply
- 10-pin DGS (VSSOP) package
Applications
Pin Configuration
Figure 4-1. DGS Package 10-Pin VSSOP Top View
Table 4-1. Pin Functions
| PIN | PIN | Type | DESCRIPTION |
|---|---|---|---|
| NAME | NO. | Type | DESCRIPTION |
| A0 | 2 | Digital input | Address pin. Connect to GND, SCL, SDA, or VS. Table 6-2 shows pin settings and corresponding addresses. |
| A1 | 1 | Digital input | Address pin. Connect to GND, SCL, SDA, or VS. Table 6-2 shows pin settings and corresponding addresses. |
| Alert | 3 | Digital output | Multi-functional alert, open-drain output. |
| GND | 7 | Analog | Ground. |
| IN+ | 10 | Analog input | Connect to supply side of shunt resistor. |
| IN- | 9 | Analog input | Connect to load side of shunt resistor. |
| SCL | 5 | Digital input | Serial bus clock line, open-drain input. |
| SDA | 4 | Digital I/O | Serial bus data line, open-drain input/output. |
| VBUS | 8 | Analog input | Bus voltage input. |
| VS | 6 | Analog | Power supply, 2.7 V to 5.5 V. |
Electrical Characteristics
TA = 25°C, VVS = 3.3 V, VIN+ = 12 V, V SENSE = (V IN+ - V IN-) = 0 mV and VVBUS = 12 V, unless otherwise noted
| PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT | |
|---|---|---|---|---|---|---|
| INPUT | ||||||
| Shunt voltage input range | -81.9175 | 81.92 | mV | |||
| Bus voltage input range (1) | 0 | 36 | V | |||
| CMRR | Common-mode rejection | 0 V ≤ V IN+ ≤ 36 V | 126 | 140 | dB | |
| V OS | Shunt offset voltage, RTI (2) | ±2.5 | ±10 | μV | ||
| Shunt offset voltage, RTI (2) vs temperature | -40°C ≤ T A ≤ 125°C | 0.02 | 0.1 | μV/°C | ||
| PSRR | Shunt offset voltage, RTI (2) vs Power supply | 2.7 V ≤ VS ≤ 5.5 V | ±2.5 | μV/V | ||
| V OS | Bus offset voltage, RTI (2) | ±1.25 | ±7.5 | mV | ||
| Bus offset voltage, RTI (2) vs temperature | -40°C ≤ T A ≤ 125°C | 10 | 40 | μV/°C | ||
| PSRR | Bus offset voltage, RTI (2) vs power supply | ±0.5 | mV/V | |||
| I B | Input bias current (I IN+ , I IN- pins) VBUS input impedance | 0.1 830 | nA kΩ | |||
| Input leakage (3) | (IN+ pin) + (IN- pin), Power-down mode | 0.1 | 0.5 | μA | ||
| DC ACCURACY | DC ACCURACY ADC native resolution | Shunt voltage | 16 2.5 | Bits μV | ||
| 1 LSB step size Shunt voltage gain error | Bus voltage | 1.25 0.02% | 0.1% | mV | ||
| Shunt voltage gain error vs temperature Bus voltage gain error | -40°C ≤ T A ≤ 125°C | 10 0.02% | 50 0.1% | ppm/°C | ||
| Bus voltage gain error vs temperature Differential nonlinearity | -40°C ≤ T A ≤ 125°C CT bit = 000 CT bit = 001 | 10 ±0.1 140 204 | 50 154 224 | ppm/°C LSB | ||
| CT bit = 010 CT bit = 011 | 332 588 | 365 646 | μs | |||
| t CT | ADC conversion time | CT bit = 100 CT bit = 101 | 1.1 2.116 | 1.21 2.328 | ||
| CT bit = 110 CT bit = 111 | 4.156 8.244 | 4.572 9.068 | ms | |||
| SMBus | ||||||
| SMBus timeout (4) | 28 | 35 | ms | |||
| DIGITAL INPUT/OUTPUT | DIGITAL INPUT/OUTPUT Input capacitance | 3 | pF | |||
| Leakage input current | 0 V ≤ V SCL ≤ V VS , 0 V ≤ V SDA ≤ V VS , 0 V ≤ V Alert ≤ V VS , 0 V ≤ V A0 ≤ V VS , 0 V ≤ V A1 ≤ V VS | 0.1 | 1 | μA | ||
| V IH | High-level input voltage | 0.7×V VS | 6 | V | ||
| V IL | Low-level input voltage | -0.5 | 0.3×V VS | V | ||
| V OL | Low-level output voltage, SDA, Alert Hysteresis | I OL = 3 mA | 0 | 500 | 0.4 | V mV |
| POWER SUPPLY | POWER SUPPLY | |||||
| Operating supply range | 2.7 | 5.5 | V | |||
| I Q | Quiescent current | 330 | 420 | μA | ||
| Quiescent current, power-down (shutdown) mode | 0.5 | 2 | μA |
| T A = 25°C, V VS = 3.3 V, V IN+ = 12 V, V SENSE = (V IN+ - V IN- ) = 0 mV and V VBUS = 12 V, unless otherwise noted | T A = 25°C, V VS = 3.3 V, V IN+ = 12 V, V SENSE = (V IN+ - V IN- ) = 0 mV and V VBUS = 12 V, unless otherwise noted | T A = 25°C, V VS = 3.3 V, V IN+ = 12 V, V SENSE = (V IN+ - V IN- ) = 0 mV and V VBUS = 12 V, unless otherwise noted | T A = 25°C, V VS = 3.3 V, V IN+ = 12 V, V SENSE = (V IN+ - V IN- ) = 0 mV and V VBUS = 12 V, unless otherwise noted | T A = 25°C, V VS = 3.3 V, V IN+ = 12 V, V SENSE = (V IN+ - V IN- ) = 0 mV and V VBUS = 12 V, unless otherwise noted | T A = 25°C, V VS = 3.3 V, V IN+ = 12 V, V SENSE = (V IN+ - V IN- ) = 0 mV and V VBUS = 12 V, unless otherwise noted |
|---|---|---|---|---|---|
| PARAMETER | PARAMETER | TEST CONDITIONS | MIN | TYP | UNIT |
| V POR | Power-on reset threshold | 2 | V |
Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted) (1)
| MIN | MAX | UNIT | ||
|---|---|---|---|---|
| V VS | Supply voltage | 6 | V | |
| Analog Inputs, IN+, IN- | Differential (V IN+ - V IN- ) (2) | -40 | 40 | V |
| Analog Inputs, IN+, IN- | Common-Mode (V IN+ + V IN- ) / 2 | -0.3 | 40 | V |
| V VBUS | -0.3 | 40 | V | |
| V SDA | GND - 0.3 | 6 | V | |
| V SCL | GND - 0.3 | V VS + 0.3 | V | |
| I IN | Input current into any pin | 5 | mA | |
| I OUT | Open-drain digital output current | 10 | mA | |
| T J | Junction temperature | 150 | °C | |
| T stg | Storage temperature range | -65 | 150 | °C |
Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
| MIN | NOM | MAX | UNIT | ||
|---|---|---|---|---|---|
| V CM | Common-mode input voltage | 12 | V | ||
| V VS | Operating supply voltage | 3.3 | V | ||
| T A | Operating free-air temperature | -40 | 125 | °C |
Thermal Information
| THERMAL METRIC (1) | INA226 DGS (VSSOP) 10 PINS | UNIT | |
|---|---|---|---|
| R θJA | Junction-to-ambient thermal resistance | 144.6 | °C/W |
| R θJC(top) | Junction-to-case (top) thermal resistance | 53.3 | °C/W |
| R θJB | Junction-to-board thermal resistance | 80.4 | °C/W |
| Ψ JT | Junction-to-top characterization parameter | 3.5 | °C/W |
| Y JB | Junction-to-board characterization parameter | 78.9 | °C/W |
| R θJC(bot) | Junction-to-case (bottom) thermal resistance | N/A | °C/W |
Typical Application
The INA226 is a current shunt and power monitor with an I2C ™ compatible interface. The device monitors both a shunt voltage drop and bus supply voltage. Programmable calibration value, conversion times, and averaging, combined with an internal multiplier, enable direct readouts of current in amperes and power in watts.
Package Information
| PART NUMBER | PACKAGE (1) | PACKAGE SIZE (2) |
|---|---|---|
| INA226 | VSSOP (10) | 3.00mm × 4.90mm |
- (1) For all available packages, see the orderable addendum at the end of the data sheet.
- (2) The package size (length × width) is a nominal value and includes pins, where applicable.
Supply Voltage
(2.7V to 5.5V)
High-Side or Low-Side Sensing Application
High-Side or Low-Side Sensing Application
Related Variants
The following components are covered by the same datasheet.
| Part Number | Manufacturer | Package |
|---|---|---|
| INA226 | Texas Instruments | — |
| INA226AIDGSR | Texas Instruments | 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) |
| INA226AIDGSRG4 | Texas Instruments | — |
| INA226AIDGST | Texas Instruments | 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) |
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