INA210 datasheet(23/39 Pages) TI1

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INA220

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SBOS459D – JUNE 2009 – REVISED SEPTEMBER 2010

The Current Register (04h) is then calculated by

this result by the power LSB that is 20 times the

multiplying

the

shunt

voltage

contents

the

1 × 10-3 current LSB, or 20 × 10-3, results in a power

Calibration Register and then dividing by 4095. For

calculation

5991

20mW/bit,

which

equals

this example, the shunt voltage of 2000 is multiplied

119.82W. This result matches what is expected for

by the calibration register of 20480 and then divided

this register. A manual calculation for the power being

by 4095 to yield a Current Register of 2712h.

delivered to the load would use 11.98V (12VCM –

20mV shunt drop) multiplied by the load current of

The Power Register (03h) is then be calculated by

10A to give a 119.8W result.

multiplying the Current Register of 10002 by the Bus

Voltage Register of 2995 and then dividing by 5000.

Table 2 shows the steps for configuring, measuring,

For this example, the Power Register contents are

and calculating the values for current and power for

1767h, or a decimal equivalent of 5991. Multiplying

this device.

Table 2. Configure/Measure/Calculate Example(1)

STEP #

ADDRESS

CONTENTS

ADJ

DEC

LSB

VALUE

Step 1

Configuration

00h

019Fh

Step 2

Shunt

01h

07D0h

2000

10µV

20mV

Step 3

Bus

02h

5D98h

0BB3

2995

4mV

11.98V

Step 4

Calibration

05h

5000h

20480

Step 5

Current

04h

2712h

10002

1mA

10.002A

Step 6

Power

03h

1767h

5991

20mW

119.82W

(1)

Conditions: load = 10A, VCM = 12V, RSHUNT = 2mΩ, VSHUNT FSR = 40mV, and VBUS = 16V.

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