Datasheet > INA229

INA229

更新时间： 2024-11-14 02:52:11

品牌	Logo	应用领域
德州仪器 - TI		/
页数	文件大小	规格书
48页	2922K
描述
INA229-Q1 AEC-Q100, 85-V, 20-Bit, Ultra-Precise Power/Energy/Charge Monitor With SPI Interface

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INA229 数据手册

INA229-Q1

SLYS024A – MAY 2020 – REVISED JUNE 2021

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

SPI Interface

1 Features

3 Description

•

AEC-Q100 qualified for automotive applications:

– Temperature grade 1: –40°C to +125°C, T_A

Functional Safety-Capable

– Documentation available to aid functional safety

system design

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.

•

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:

The INA229-Q1 reports current, bus voltage,

temperature, power, energy and charge accumulation

while employing

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.

•

– 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:

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.

•

±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)

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.

2 Applications

Device Information⁽¹⁾

•

Automotive battery management systems

EV / HEV mA - KA sense applications

DC/DC converters and power inverters

ADAS domain controllers

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.

Power

Reference

IN+

IN-

SCLK

Voltage Current

Power Energy

Charge Temp

MOSI

MISO

20 Bit

ADC

MUX

SPI

VBUS

Oscillator

Out-of-range

Threshold

ALERT

GND

Simplified Block Diagram

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.

12 3 4 5 6 7...48

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