Datasheet

INA226
www.ti.com SBOS547 –JUNE 2011
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, VIN+ = 12V, V
SENSE
= (VIN+ – VIN–) = 0mV, V
BUS
= 12V, unless otherwise noted.
INA226
PARAMETER CONDITIONS MIN TYP MAX UNIT
INPUT
Shunt voltage input range -81.9175 81.92 mV
Bus voltage input range
(1)
0 36 V
Common-mode rejection CMRR V
IN
+ = 0V to +36V 126 140 dB
Shunt offset voltage, RTI
(2)
V
OS
±2.5 ±10 μV
vs Temperature 0.02 0.1 μV/°C
vs Power supply PSRR V
S
= +2.7V to +5.5V 2.5 μV/V
Bus offset voltage, RTI
(2)
V
OS
±1.25 ±7.5 mV
vs Temperature 10 40 μV/°C
vs Power supply PSRR 0.5 mV/V
Input bias current I
IN+
, I
IN-
10 μA
V
BUS
input impedance 830 kΩ
(VIN+ Pin) + (VIN– Pin),
Input leakage
(3)
0.1 0.5 μA
Power-down mode
DC ACCURACY
ADC native resolution 16 Bits
1 LSB step size Shunt voltage 2.5 μV
Bus voltage 1.25 mV
Shunt voltage gain error 0.02 0.1 %
vs Temperature 10 50 ppm/°C
Bus voltage gain error 0.02 0.1 %
vs Temperature 10 50 ppm/°C
Differential nonlinearity ±0.1 LSB
ADC conversion time CT bit = 000 140 154 μs
CT bit = 001 204 224 μs
CT bit = 010 332 365 μs
CT bit = 011 588 646 μs
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
SMBus timeout
(4)
28 35 ms
DIGITAL INPUT/OUTPUT
Input capacitance 3 pF
Leakage input current 0 ≤ V
IN
≤ V
S
0.1 1 μA
Input logic levels:
V
IH
0.7(V
S
) 6 V
V
IL
–0.5 0.3(V
S
) V
Output logic level
V
OL
SDA, alert I
OL
= 3mA 0 0.4 V
Hysteresis 500 mV
(1) While the input range is 36V, the full-scale range of the ADC scaling is 40.96V. See the Basic ADC Functions section. Do not apply
more than 36V.
(2) RTI = Referred-to-input.
(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 INA226 resets the interface any time SCL is low for more than 28ms.
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