INA220B-Q1 Datasheet, PDF (4/39 Pages) Texas Instruments – High- or Low-Side, Bidirectional Current Power Monitor with 2-Wire Interface

INA220B-Q1
SLOS785A – JUNE 2012 – REVISED JUNE 2012
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ELECTRICAL CHARACTERISTICS: V_S = 3.3V
Boldface limits apply over the specified temperature range, T_A = –40°C to 125°C.
At T_A = 25°C, V_IN+ = 12 V, V_SENSE = (V_IN+ – V_IN–) = 32 mV, V_BUS = 12 V, PGA = ÷ 1, and BRNG⁽¹⁾ = 1, unless otherwise noted.
INA220B-Q1
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
INPUT
Full-Scale Current Sense (Input) Voltage Range
PGA = ÷ 1
0
±40
mV
PGA = ÷ 2
0
±80
mV
PGA = ÷ 4
0
±160
mV
PGA = ÷ 8
0
±320
mV
Bus Voltage (Input Voltage) Range⁽²⁾
BRNG = 1
0
32
V
BRNG = 0
0
16
V
Common-Mode Rejection
Offset Voltage, RTI⁽³⁾
CMRR
V_OS
V_IN+ = 0 V to 26 V
PGA = ÷ 1
PGA = ÷ 2
100
120
dB
±10
±50 ⁽⁴⁾
μV
±20
±75
μV
PGA = ÷ 4
±30
±75
μV
PGA = ÷ 8
±40
±100
μV
versus Temperature
0.16
μV/°C
versus Power Supply
Current Sense Gain Error
PSRR
V_S = 3 V to 5.5 V
10
μV/V
±40
m%
versus Temperature, MSOP-10
1
m%/°C
Input Impedance
Active Mode
V_IN+ Pin
V_IN– Pin
V_BUS Pin ⁽⁵⁾
Input Leakage⁽⁶⁾
Power-Down Mode
20
μA
20
μA
320
kΩ
V_IN+ Pin
V_IN– Pin
DC ACCURACY
0.1
±0.5
μA
0.1
±0.5
μA
ADC Basic Resolution
12
Bits
1LSB Step Size
Shunt Voltage
10
μV
Bus Voltage
4
mV
Current Measurement Error
±0.2
±0.3
%
over Temperature
±0.5
%
Bus Voltage Measurement Error
over Temperature
V_BUS = 12 V
±0.2
±0.5
%
±1
%
Differential Nonlinearity
±0.1
LSB
ADC TIMING
ADC Conversion Time
12-Bit
532
586
μs
11-Bit
276
304
μs
10-Bit
148
163
μs
9-Bit
84
93
μs
Minimum Convert Input Low Time
4
μs
SMBus
SMBus Timeout⁽⁷⁾
28
35
ms
(1) BRNG is bit 13 of the Configuration Register.
(2) This parameter only expresses the full-scale range of the analog-to-digital converter (ADC) scaling. In no event should more than 26 V
be applied to this device.
(3) Referred-to-input (RTI).
(4) Shaded cells indicate improved specifications of the INA220B-Q1.
(5) The input impedance of this pin may vary approximately ±15%.
(6) Input leakage is positive (current flowing into the pin) for the conditions shown at the top of the table. Negative leakage currents can
occur under different input conditions.
(7) System management bus (SMBus) timeout in the INA220B-Q1 resets the interface any time SCL or SDA is low for over 28 ms.
4
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