Datasheet

INA230
www.ti.com SBOS601 –FEBRUARY 2012
ELECTRICAL CHARACTERISTICS
At T
A
= +25°C, V
S
= +3.3 V, V
IN+
= 12 V, V
SENSE
= (V
IN+
– V
IN–
) = 0 mV, and V
BUS
= 12 V, unless otherwise noted.
INA230
PARAMETER CONDITIONS MIN TYP MAX UNIT
SHUNT INPUT
Shunt voltage input range -81.92 81.9175 mV
CMR Common-mode rejection V
IN+
= 0 V to +28 V 100 120 dB
±10 ±50 μV
V
OS
Shunt offset voltage, RTI
(1)
T
A
= –40°C to +125°C 0.1 0.5 μV/°C
PSRR vs power supply V
S
= +2.7 V to +5.5 V 10 μV/V
BUS INPUT
Bus voltage input range
(2)
0 28 V
±5 ±30 mV
V
OS
Bus offset voltage, RTI
(1)
T
A
= –40°C to +125°C 10 40 μV/°C
PSRR vs power supply 2 mV/V
BUS pin input impedance 830 kΩ
INPUT
I
IN+
, I
IN-
Input bias current 10 μA
Input leakage
(3)
(V
IN+
) + (V
IN–
), Power-Down mode 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
T
A
= –40°C to +125°C 10 50 ppm/°C
0.2 0.5 %
Bus voltage gain error
T
A
= –40°C to +125°C 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
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
V
IH
High-level input voltage 0.7(V
S
) 6 V
V
IL
Low-level input voltage –0.5 0.3(V
S
) V
V
OL
Low-level output voltage (SDA, ALERT) I
OL
= 3 mA 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 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 INA230 resets the interface any time SCL is low for more than 28 ms.
Copyright © 2012, Texas Instruments Incorporated 3