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INA228 Datasheet(PDF) 35 Page - Texas Instruments

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Part # INA228
Description  INA228 85-V, 20-Bit, Ultra-Precise Power/Energy/Charge Monitor With I2C Interface
PDF  48 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

INA228 Datasheet(HTML) 35 Page - Texas Instruments

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<100
<100
IN+
IN-
VBUS
VS
GND
100 nF
VS = 2.7V± 5.5V
Load
Load
Supply
CFILTER
0.1µF to 1µF
RFILTER
RDIFF
RSHUNT
Figure 8-1. Input Filtering
Do not use values greater than 100 ohms for RFILTER. Doing so will degrade gain error and increase non-
linearity.
8.2 Typical Application
The low offset voltage and low input bias current of the INA228 allow accurate monitoring of a wide range of
currents. To accurately monitor currents with high resolution, select the value of the shunt resistor so that the
resulting sense voltage is close to the maximum allowable differential input voltage range (either ±163.84 mV or
±40.96 mV, depending on register settings). The circuit for monitoring currents in a high-side configuration is
shown in Figure 8-2.
IN+
IN-
VBUS
V
S
A0
A1
SCL
SDA
ALERT
GND
R
SHUNT
48V
BATT
GND
10k
100 nF
V
S = 2.7V
± 5.5V
V
S
I
2C
I/F
LOAD
CHARGER
10k
10k
To
MCU
*
* I
2C ADDR: 0x40
Figure 8-2. INA228 High-Side Sensing Application Diagram
8.2.1 Design Requirements
The INA228 measures the voltage developed across a current-sensing resistor (RSHUNT) when current passes
through it. The device also measures the bus supply voltage and calculates power when calibrated. It also
comes with alert capability, where the alert pin can be programmed to respond to a user-defined event or a
conversion ready notification.
The design requirements for the circuit shown in Figure 8-2 are listed in Table 8-3.
Table 8-3. Design Parameters
DESIGN PARAMETER
EXAMPLE VALUE
Power-supply voltage (VS)
5 V
Bus supply rail (VCM)
48 V
Bus supply rail over voltage fault threshold
52 V
Average Current
6 A
Overcurrent fault threshold (IMAX)
10 A
www.ti.com
INA228
SLYS021 – JANUARY 2021
Copyright © 2021 Texas Instruments Incorporated
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Product Folder Links: INA228



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