Shunt integrated circuit current sensor INA219

board-mountfor printed circuit boardsPCB

Overview The INA219 is a current shunt and power monitor with an I2C- or SMBus-compatible interface. The device measures shunt voltage drop and bus supply voltage with programmable conversion times and digital filtering. A programmable calibration value and internal multiplier enable direct current readouts in amperes; an additional multiplying register calculates power in watts. The I2C/SMBus interface supports 16 programmable addresses. The INA219 is offered in two accuracy grades, A and B (B = higher accuracy). It senses across shunts on buses from 0 to 26 V and operates from a single 3 to 5.5 V supply, drawing up to 1 mA. Operating temperature range: −40 °C to 125 °C.

Key features

• Senses bus voltages from 0 to 26 V
• Reports current, bus voltage and power
• 16 programmable I2C/SMBus addresses
• High accuracy up to 0.5% (INA219B)
• Programmable conversion times and digital filtering
• Calibration registers for direct current readout in amperes
• Available in SOT-23-8 and SOIC-8 packages

Technical specifications

• Common-mode voltage (max): 26 V
• Common-mode voltage (min): 0 V
• Digital interface: I2C, SMBus
• Resolution: 12 bits
• Input offset (±) (max): 50 µV, 100 µV (depending on grade)
• Input offset drift (±) (max): 0.5 µV/°C
• Input offset drift (±) (typ): 0.1 µV/°C
• Voltage gain (V/V): 0.125, 0.25, 0.5, 1
• CMRR (min): 100 dB
• Supply voltage (max): 5.5 V
• Supply voltage (min): 3 V
• Supply current Iq (max): 1 mA
• Gain error (%): 0.3, 0.5
• Gain error drift (±) (max): 83, 167 ppm/°C
• Features: Bidirectional measurement, integrated power monitor, programmable gain
• Number of channels: 1
• Power measurement accuracy: 0.8%, 1% (depending on grade/configuration)
• Rating: Catalog
• Operating temperature range: -40 to 125 °C

Applications

• Power management and monitoring
• Battery-powered systems current and power measurement
• Energy consumption and efficiency monitoring
• Measurement front-ends for protection and metering