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INA220 Datasheet(PDF) 5 Page - Texas Instruments |
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INA220 Datasheet(HTML) 5 Page - Texas Instruments |
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5 / 36 page  5 INA220 www.ti.com SBOS459E – JUNE 2009 – REVISED JANUARY 2016 Product Folder Links: INA220 Submit Documentation Feedback Copyright © 2009–2016, Texas Instruments Incorporated (1) BRNG is bit 13 of the Configuration Register 00h (see Figure 19). (2) This parameter only expresses the full-scale range of the ADC scaling. In no event should more than 26 V be applied to this device. (3) Referred-to-input (RTI) (4) Indicates improved specifications of the INA220B. (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) SMBus timeout in the INA220 resets the interface any time SCL or SDA is low for more than 28 ms. 7.5 Electrical Characteristics at TA = 25°C, VS = 3.3 V, VIN+ = 12 V, VSHUNT = (VIN+ – VIN–) = 32 mV, VVBUS = 12 V, PGA = /1, and BRNG (1) = 1, unless otherwise noted. TEST CONDITIONS INA220A INA220B UNIT MIN TYP MAX MIN TYP MAX INPUT Full-scale current sense (input) voltage range VSHUNT PGA = /1 0 ±40 0 ±40 mV PGA = /2 0 ±80 0 ±80 mV PGA = /4 0 ±160 0 ±160 mV PGA = /8 0 ±320 0 ±320 mV Bus voltage (input voltage)(2) BRNG = 1 0 32 0 32 V BRNG = 0 0 16 0 16 V Common-mode rejection VIN+ = 0 to 26 V 100 120 100 120 dB Offset Voltage, RTI(3) VOS PGA = /1 ±10 ±100 ±10 ±50(4) μV PGA = /2 ±20 ±125 ±20 ±75(4) μV PGA = /4 ±30 ±150 ±30 ±75(4) μV PGA = /8 ±40 ±200 ±40 ±100(4) μV TA = –40°C to 85°C 0.16 0.16 μV/°C versus power supply PSRR VS = 3 to 5.5 V 10 10 μV/V Current sense gain error ±40 ±40 m% TA = –40°C to 85°C 1 1 m%/°C IN+ pin input impedance Active mode 20 20 μA IN– pin input impedance Active mode 20 20 μA VBUS pin input impedance(5) Active mode 320 320 k Ω IN+ pin input leakage(6) Power-down mode 0.1 ±0.5 0.1 ±0.5 μA IN– pin input leakage(6) Power-down mode 0.1 ±0.5 0.1 ±0.5 μA DC ACCURACY ADC basic resolution 12 12 bits Shunt voltage 1-LSB step size 10 10 μV Bus voltage 1-LSB step size 4 4 mV Current measurement error ±0.2% ±0.5% ±0.2% ±0.3%(4) over Temperature TA = –40°C to 85°C ±1% ±0.5%(4) Bus voltage measurement error VBUS = 12 V ±0.2% ±0.5% ±0.2% ±0.5% over Temperature TA = –40°C to 85°C ±1% ±1% Differential nonlinearity ±0.1 ±0.1 LSB ADC TIMING ADC conversion time 12-bit 532 586 532 586 μs 11-bit 276 304 276 304 μs 10-bit 148 163 148 163 μs 9-bit 84 93 84 93 μs Minimum convert input low time 4 4 μs SMBus SMBus timeout(7) 28 35 28 35 ms |
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