INA219

Part: INA219 — Texas Instruments

Type: Bidirectional Current/Power Monitor (high-side shunt monitor with I²C/SMBus interface)

Description: Zerø-drift current/power monitor that senses bus voltages from 0 to 26 V, runs from a single 3–5.5 V supply (1 mA max), has a 12-bit ADC and I²C/SMBus interface with 16 programmable addresses, and offers 0.5% (max) accuracy over temperature in the B grade.

Operating Conditions:

• Supply voltage: 3–5.5 V
• Operating temperature: -25 to 85 °C (Recommended Operating Conditions TA; the Absolute Maximum Ratings table lists -40 to 125 °C)
• Bus voltage range: 0–32 V (BRNG = 1) or 0–16 V (BRNG = 0) per the electrical characteristics; common-mode sensing up to 26 V
• Full-scale shunt voltage: ±40 mV (PGA /1) up to ±320 mV (PGA /8)

Absolute Maximum Ratings:

• Supply voltage (VS): 6 V
• Analog inputs IN+, IN-: differential -26 to 26 V; common-mode -0.3 to 26 V
• SDA: GND - 0.3 to 6 V
• SCL: GND - 0.3 to VS + 0.3 V
• Input current into any pin: 5 mA
• Open-drain digital output current: 10 mA
• Max junction temperature: 150 °C
• Storage temperature: -65 to 150 °C
• ESD: HBM ±4000 V, CDM ±750 V, MM ±200 V

Key Specs:

• ADC resolution: 12 bits; shunt voltage LSB 10 μV, bus voltage LSB 4 mV
• Current measurement error (TA = 25 °C): ±0.2% typ; ±0.5% max (A), ±0.3% max (B)
• Current measurement error over -25 to 85 °C: ±1% max (A), ±0.5% max (B)
• Bus voltage measurement error: ±0.2% typ, ±0.5% max at 25 °C; ±1% max over -25 to 85 °C
• Offset voltage, PGA /1: ±10 μV typ; ±100 μV max (A), ±50 μV max (B)
• Common-mode rejection (VIN+ = 0 to 26 V): 100 dB min, 120 dB typ
• Quiescent current: 0.7 mA typ, 1 mA max; power-down mode 6 μA typ, 15 μA max
• ADC conversion time (12-bit): 532 μs typ, 586 μs max
• SCL frequency: up to 0.4 MHz (fast mode), 2.56 MHz (high-speed mode)
• Thermal resistance RθJA: 111.3 °C/W (SOIC-8), 135.4 °C/W (SOT-23-8)

Features:

• Senses bus voltages from 0 to 26 V
• Reports current, voltage, and power
• 16 programmable addresses
• High accuracy: 0.5% (max) over temperature (INA219B)
• Filtering options
• Calibration registers
• Compatible with TI hot swap controllers such as the TPS2490

Applications:

• Servers
• Telecom equipment
• Notebook computers
• Power management
• Battery chargers
• Welding equipment
• Power supplies
• Test equipment

Package:

• SOIC-8 (3.91 mm × 4.90 mm)
• SOT-23-8 (1.63 mm × 2.90 mm)

• Servers
• Telecom Equipment
• Notebook Computers
• Power Management
• Battery Chargers
• Welding Equipment
• Power Supplies
• Test Equipment

The INA219 is a current shunt and power monitor with an I 2 Cor 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 I 2 Cor 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.

At TA = 25°C, VS = 3.3 V, VIN+ = 12V, VSHUNT = (VIN+ - VIN-) = 32 mV, PGA = /1, and BRNG (1) = 1, unless otherwise noted.

over operating free-air temperature range (unless otherwise noted) (1)

over operating free-air temperature range (unless otherwise noted)

The INA219 is a current shunt and power monitor with an I 2 C- and SMBus-compatible interface. The device monitors both a shunt voltage drop and bus supply voltage. Programmable calibration value, combined with an internal multiplier, enable readouts of current and power.