Texas Instruments INA2227 16-Bit Digital Current Monitor
Texas Instruments INA2227 Dual Channel 16-Bit Digital Current Monitor has an I2C/SMBus-compatible interface compliant with digital bus voltages from 1.2V to 5V. The device monitors the voltage across an external sense resistor and reports the values for each channel's shunt voltage, bus voltage, current, power, and energy.
The INA2227 features programmable ADC conversion times and averaging that is common for all channels. Each channel has a programmable calibration value with an internal multiplier. This feature enables direct readouts of current in amperes, energy in joules, and power in watts. Each channel has a dedicated VBUS pin to monitor the bus voltage and can alert on overcurrent and undercurrent conditions and undervoltage and overvoltage conditions. A high input impedance while in current measurement mode allows for larger current sense resistors to measure small value system currents.
The Texas Instruments INA2227 senses current on common-mode bus voltages, independent of the supply voltage, varying from –0.3V to +48V. The device draws a typical supply current of 400µA in normal operation while operating from a single 1.7V to 5.5V supply. The device can be placed in a low-power standby mode where the typical operating current is 2.5µA and can be fully disabled using the enable pin to achieve a supply current less than 50nA. The device features up to 16 programmable addresses and is specified over the operating temperature range between -40°C and +125°C.
Features
- High-side or low-side current sensing
- Operates from a 1.7V to 5.5V power supply
- Reports current, voltage, power, and energy
- 20mV/80mV programmable full-scale range
- –0.3V to +48V input common mode range
- Current monitoring accuracy
- 16-bit ADC resolution
- 0.5% gain error (max.)
- 75µV offset (max.)
- Power monitoring accuracy of 1% full scale (max.)
- Energy monitoring accuracy of 1.5% full scale (max.)
- 5nA (max.) low input bias currents
- 50nA (max.) low disable current
- Configurable averaging options
- Alert limits for over and under current events
- 1.2V compliant I2C, SMBus interface
- 16-pin selectable addresses
- DSBGA-16 package (1.5mm × 1.5mm)
Applications
- Notebook computers
- Security cameras
- Retail automation
- Power management
- Battery cell monitors and balancers
- Rack servers
- eFuse current and power monitoring
Functional Block Diagram
