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器件3D模型￥ 6.712
INA226AIDGST 数据手册 - TI（德州仪器）
制造商:
TI（德州仪器）
分类:
电源管理
封装:
VSSOP-10
描述:
TEXAS INSTRUMENTS INA226AIDGST 电流检测放大器, 双向电流, 1个放大器, 10 µA, MSOP, 10 引脚, -40 °C, 125 °C
Pictures:
3D模型
符号图
焊盘图
引脚图
产品图
页面导航:
引脚图在P3Hot
典型应用电路图在P28P29
原理图在P10P21
封装尺寸在P32P34P35
标记信息在P32
封装信息在P31P32P33P34P35
技术参数、封装参数在P4
应用领域在P1P28P29P30P38
电气规格在P5P6
导航目录
INA226AIDGST数据手册
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ADC
´
´
Shunt Voltage
Channel
Bus Voltage
Channel
Shunt Voltage
(1)
Data Registers
Calibration
(2)
Current
(1)
Bus Voltage
(1)
Power
(1)
INA226
SBOS547A –JUNE 2011–REVISED AUGUST 2015
www.ti.com
7 Detailed Description
7.1 Overview
The INA226 is a digital current sense amplifier with an I
2
C- and SMBus-compatible interface. It provides digital
current, voltage, and power readings necessary for accurate decision-making in precisely-controlled systems.
Programmable registers allow flexible configuration for measurement resolution as well as continuous-versus-
triggered operation. Detailed register information appears at the end of this data sheet, beginning with Table 4.
See the Functional Block Diagram section for a block diagram of the INA226 device.
7.2 Functional Block Diagram
(1) Read-only
(2) Read/write
7.3 Feature Description
7.3.1 Basic ADC Functions
The INA226 device performs two measurements on the power-supply bus of interest. The voltage developed
from the load current that flows through a shunt resistor creates a shunt voltage that is measured at the IN+ and
IN– pins. The device can also measure the power supply bus voltage by connecting this voltage to the VBUS pin.
The differential shunt voltage is measured with respect to the IN– pin while the bus voltage is measured with
respect to ground.
The device is typically powered by a separate supply that can range from 2.7 V to 5.5 V. The bus that is being
monitored can range in voltage from 0 V to 36 V. Based on the fixed 1.25-mV LSB for the Bus Voltage Register
that a full-scale register results in a 40.96 V value.
NOTE
Do not apply more than 36 V of actual voltage to the input pins.
There are no special considerations for power-supply sequencing because the common-mode input range and
power-supply voltage are independent of each other; therefore, the bus voltage can be present with the supply
voltage off, and vice-versa.
The device takes two measurements, shunt voltage and bus voltage. It then converts these measurements to
current, based on the Calibration Register value, and then calculates power. Refer to the Programming the
Calibration Register section for additional information on programming the Calibration Register.
10 Submit Documentation Feedback Copyright © 2011–2015, Texas Instruments Incorporated
Product Folder Links: INA226
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