INA231

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SBOS644 – FEBRUARY 2013

ELECTRICAL CHARACTERISTICS

INA231

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNIT

SHUNT INPUT

Shunt voltage input range

-81.92

81.9175

mV

CMR

Common-mode rejection

100

120

dB

±10

±50

μV

0.1

0.5

μV/°C

PSRR

vs power supply

10

μV/V

BUS INPUT

0

28

V

±5

±30

mV

10

40

μV/°C

PSRR

vs power supply

2

mV/V

BUS pin input impedance

830

k

Ω

INPUT

Input bias current

10

μA

0.1

0.5

μA

DC ACCURACY

ADC native resolution

16

Bits

Shunt voltage

2.5

μV

1 LSB step size

Bus voltage

1.25

mV

0.2

0.5

%

Shunt voltage gain error

10

50

ppm/°C

0.2

0.5

%

Bus voltage gain error

10

50

ppm/°C

Differential nonlinearity

±0.1

LSB

CT bit = 000

140

154

μs

CT bit = 001

204

224

μs

CT bit = 010

332

365

μs

CT bit = 011

588

646

μs

ADC conversion time

CT bit = 100

1.1

1.21

ms

CT bit = 101

2.116

2.328

ms

CT bit = 110

4.156

4.572

ms

CT bit = 111

8.244

9.068

ms

SMBus

28

35

ms

DIGITAL INPUT/OUTPUT

Input capacitance

3

pF

Leakage input current

0

0.5

2

μA

High-level input voltage

1.4

6

V

Low-level input voltage

–0.5

0.4

V

0

0.4

V

Hysteresis

500

mV

(1)

RTI = Referred-to-input.

(2)

Although the input range is 28 V, the full-scale range of the ADC scaling is 40.96 V. Do not apply more than 28 V. See the Basic

Analog-to-Digital Converter (ADC) Functions section for more details

(3)

Input leakage is positive (current flowing into the pin) for the conditions shown at the top of this table. Negative leakage currents can

occur under different input conditions.

(4)

SMBus timeout in the INA231 resets the interface any time SCL is low for more than 28 ms.

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