The INA229-Q1 is an ultra-precise digital power monitor with a 20-bit delta-sigma ADC specifically designed for current-sensing applications. The device can measure a full-scale differential input of ±163.84 mV or ±40.96 mV across a resistive shunt sense element with common-mode voltage support from –0.3 V to +85 V.
The INA229-Q1 reports current, bus voltage, temperature, power, energy and charge accumulation while employing a precision ±0.5% integrated oscillator, all while performing the needed calculations in the background. The integrated temperature sensor is ±1°C accurate for die temperature measurement and is useful in monitoring the system ambient temperature.
The low offset and gain drift design of the INA229-Q1 allows the device to be used in precise systems that do not undergo multi-temperature calibration during manufacturing. Further, the very low offset voltage and noise allow for use in mA to kA sensing applications and provide a wide dynamic range without significant power dissipation losses on the sensing shunt element. The low input bias current of the device permits the use of larger current-sense resistors, thus providing accurate current measurements in the micro-amp range.
The device allows for selectable ADC conversion times from 50 µs to 4.12 ms as well as sample averaging from 1x to 1024x, which further helps reduce the noise of the measured data.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
INA229-Q1 | VSSOP (10) | 3.00 mm × 3.00 mm |
Changes from Revision * (May 2020) to Revision A (June 2021)
PIN | TYPE | DESCRIPTION | |
---|---|---|---|
NO. | NAME | ||
1 | CS | Digital input | SPI chip select (Active Low). |
2 | MOSI | Digital input | SPI digital data input. |
3 | ALERT | Digital output | Open-drain alert output, default state is active low. |
4 | MISO | Digital output | SPI digital data output (push-pull). |
5 | SCLK | Digital input | SPI clock input. |
6 | VS | Power supply | Power supply, 2.7 V to 5.5 V. |
7 | GND | Ground | Ground. |
8 | VBUS | Analog input | Bus voltage input. |
9 | IN– | Analog input | Negative input to the device. For high-side applications, connect to load side of sense resistor. For low-side applications, connect to ground side of sense resistor. |
10 | IN+ | Analog input | Positive input to the device. For high-side applications, connect to power supply side of sense resistor. For low-side applications, connect to load side of sense resistor. |
MIN | MAX | UNIT | ||
---|---|---|---|---|
VS | Supply voltage | 6 | V | |
VIN+, VIN– (2) | Differential (VIN+) – (VIN–) | –40 | 40 | V |
Common-mode | –0.3 | 85 | V | |
VVBUS | –0.3 | 85 | V | |
VIO | MOSI, MISO, SCLK, ALERT | GND – 0.3 | vs. + 0.3 | V |
IIN | Input current into any pin | 5 | mA | |
IOUT | Digital output current | 10 | mA | |
TJ | Junction temperature | 150 | °C | |
Tstg | Storage temperature | –65 | 150 | °C |
VALUE | UNIT | |||
---|---|---|---|---|
V(ESD) | Electrostatic discharge | Human body model (HBM), per AEC Q100-002, all pins(1) HBM ESD Classification Level 2 | ±2000 | V |
Charged device model (CDM), per AEC Q100-011, all pins CDM ESD Classification Level C6 | ±1000 |
MIN | NOM | MAX | UNIT | ||
---|---|---|---|---|---|
VCM | Common-mode input range | –0.3 | 85 | V | |
VS | Operating supply range | 2.7 | 5.5 | V | |
TA | Ambient temperature | –40 | 125 | °C |