INA229-Q1 AEC-Q100, 85-V, 20-Bit, Ultra-Precise Power/Energy/Charge Monitor With

SPI Interface

1 Features

• AEC-Q100 qualified for automotive applications:

• Functional Safety-Capable

– Documentation available to aid functional safety

system design

• High-resolution, 20-bit delta-sigma ADC

• Current monitoring accuracy:

– Offset voltage: ±1 µV (maximum)

– Offset drift: ±0.01 µV/°C (maximum)

– Gain error: ±0.05% (maximum)

– Gain error drift: ±20 ppm/°C (maximum)

– Common mode rejection: 154 dB (minimum)

• Power monitoring accuracy:

– 0.5% full scale, –40°C to +125°C (maximum)

• Energy and charge accuracy:

– 1.0% full scale (maximum)

• Fast alert response: 75 μs

• Wide common-mode range: –0.3 V to +85 V

• Bus voltage sense input: 0 V to 85 V

• Shunt full-scale differential range:

±163.84 mV / ±40.96 mV

• Input bias current: 2.5 nA (maximum)

• Temperature sensor: ±1°C (maximum at 25°C)

• Programmable resistor temperature compensation

• Programmable conversion time and averaging

• 10-MHz SPI communication interface

• Operates from a 2.7-V to 5.5-V supply:

– Operational current: 640 µA (typical)

– Shutdown current: 5 µA (maximum)

2 Applications

• Automotive battery management systems

• EV / HEV mA - KA sense applications

• DC/DC converters and power inverters

• ADAS domain controllers

3 Description

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.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

INA229-Q1

VSSOP (10)

3.00 mm × 3.00 mm

(1)

For all available packages, see the package option

addendum at the end of the data sheet.

Oscillator

Voltage

Current

Power

Energy

Charge

Temp

+

±

SCLK

MOSI

MISO

CS

VS

Power

GND

ALERT

IN+

IN-

VBUS

SPI

20 Bit

ADC

Reference

Out-of-range

Threshold

MUX

Simplified Block Diagram

INA229-Q1

SLYS024A – MAY 2020 – REVISED JUNE 2021

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.