Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - current control/management Current monitoring VSSOP 10

PowerRegister

CurrentRegister

Two-Wire

Interface

VoltageRegister

(SupplyVoltage)

ADC

INA220

GND

IN+

IN-

SDA

DATA

SCL

CLK

0.1 F

BYPASS

+3.3Vto

+5V

BusVoltageInput

High-

Side

Shunt

Low-

Side

Shunt

Load

Supply(0to26V)

INA220

www.ti.com

SBOS459D –JUNE 2009–REVISED SEPTEMBER 2010

High or Low Side, Bi-Directional

CURRENT/POWER MONITOR with Two-Wire Interface

Check for Samples: INA220

FEATURES

DESCRIPTION

• HIGH- or LOW-SIDE SENSING

The INA220 is a current shunt and power monitor

with an Two-Wire interface. The INA220 monitors

• SENSES BUS VOLTAGES FROM 0V TO +26V

both shunt drop and supply voltage. A programmable

• REPORTS CURRENT, VOLTAGE, AND POWER

calibration value, combined with an internal multiplier,

• 16 PROGRAMMABLE ADDRESSES

enables direct readouts in amperes. An additional

• HIGH ACCURACY: 0.5% (Max) OVER multiplying register calculates power in watts. The

Two-Wire interface features 16 programmable

TEMPERATURE (INA220B)

addresses. The separate shunt input on the INA220

• USER-PROGRAMMABLE CALIBRATION

allows it to be used in systems with low-side sensing.

• FAST (3.4MHz) TWO-WIRE MODE

The INA220 is available in two grades: A and B. The

• MSOP-10 PACKAGE

B grade version has higher accuracy and higher

precision specifications.

APPLICATIONS

The INA220 senses across shunts on buses that can

• SERVERS

vary from 0V to 26V, useful for low-side sensing or

• TELECOM EQUIPMENT

CPU power supplies. The device uses a single +3V

• NOTEBOOK COMPUTERS

to +5.5V supply, drawing a maximum of 1mA of

• POWER MANAGEMENT

supply current. The INA220 operates from –40°C to

+125°C.

• BATTERY CHARGERS

• AUTOMOTIVE

Summary of content (38 pages)

PAGE 1
INA220 www.ti.com SBOS459D – JUNE 2009 – REVISED SEPTEMBER 2010 High or Low Side, Bi-Directional CURRENT/POWER MONITOR with Two-Wire Interface Check for Samples: INA220 FEATURES DESCRIPTION • • • • • The INA220 is a current shunt and power monitor with an Two-Wire interface. The INA220 monitors both shunt drop and supply voltage. A programmable calibration value, combined with an internal multiplier, enables direct readouts in amperes. An additional multiplying register calculates power in watts.
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INA220 SBOS459D – JUNE 2009 – REVISED SEPTEMBER 2010 www.ti.com This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure.
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INA220 www.ti.com SBOS459D – JUNE 2009 – REVISED SEPTEMBER 2010 ELECTRICAL CHARACTERISTICS: VS = +3.3V Boldface limits apply over the specified temperature range, TA = –40°C to +85°C. At TA = +25°C, VIN+ = 12V, VSENSE = (VIN+ – VIN–) = 32mV, VBUS = 12V, PGA = ÷ 1, and BRNG (1) = 1, unless otherwise noted.
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INA220 SBOS459D – JUNE 2009 – REVISED SEPTEMBER 2010 www.ti.com ELECTRICAL CHARACTERISTICS: VS = +3.3V (continued) Boldface limits apply over the specified temperature range, TA = –40°C to +85°C. At TA = +25°C, VIN+ = 12V, VSENSE = (VIN+ – VIN–) = 32mV, VBUS = 12V, PGA = ÷ 1, and BRNG(1) = 1, unless otherwise noted.
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INA220 www.ti.com SBOS459D – JUNE 2009 – REVISED SEPTEMBER 2010 PIN CONFIGURATIONS DGS PACKAGE MSOP-10 (Top View) A1 1 10 VIN+ A0 2 9 VIN- NC 3 8 VBUS SDA 4 7 GND SCL 5 6 VS PIN DESCRIPTIONS: MSOP-10 MSOP-10 (DGS) PIN NO NAME DESCRIPTION 1 A1 Address pin. Connect to GND, SCL, SDA, or VS. Table 1 shows pin settings and corresponding addresses. 2 A0 Address pin. Connect to GND, SCL, SDA, or VS. Table 1 shows pin settings and corresponding addresses.
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INA220 SBOS459D – JUNE 2009 – REVISED SEPTEMBER 2010 www.ti.com TYPICAL CHARACTERISTICS At TA = +25°C, VIN+ = 12V, VSENSE = (VIN+ – VIN–) = 32mV, PGA = ÷ 1, and BRNG = 1, unless otherwise noted. ADC SHUNT OFFSET vs TEMPERATURE 100 -10 80 -20 60 -30 40 Offset (mV) Gain (dB) FREQUENCY RESPONSE 0 -40 -50 -60 20 0 -20 -70 -40 -80 -60 -90 -80 -100 -100 1k 100 10 10k 100k 320mV Range 160mV Range 1M 80mV Range -50 0 -25 Input Frequency (Hz) 50 75 100 125 Figure 2.
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INA220 www.ti.com SBOS459D – JUNE 2009 – REVISED SEPTEMBER 2010 TYPICAL CHARACTERISTICS (continued) At TA = +25°C, VIN+ = 12V, VSENSE = (VIN+ – VIN–) = 32mV, PGA = ÷ 1, and BRNG = 1, unless otherwise noted. INPUT CURRENTS WITH LARGE DIFFERENTIAL VOLTAGES (VIN+ at 12V, Sweep of VIN–) ACTIVE IQ vs TEMPERATURE 2.0 1.2 VS+ = 5V 1.0 VS = 5V 1.0 0.8 0.5 IQ (mA) Input Currents (mA) 1.5 VS+ = 3V 0 VS+ = 3V 0.6 VS = 3V 0.4 -0.5 0.2 -1.0 VS+ = 5V 0 -1.
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INA220 SBOS459D – JUNE 2009 – REVISED SEPTEMBER 2010 www.ti.com REGISTER BLOCK DIAGRAM Power (1) Bus Voltage (1) ´ Shunt Voltage Channel Current (1) ADC Bus Voltage Channel Calibration (2) ´ Shunt Voltage (1) PGA (In Configuration Register) Data Registers (1) Read-only. (2) Write-only. Figure 13.
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INA220 www.ti.com SBOS459D – JUNE 2009 – REVISED SEPTEMBER 2010 APPLICATION INFORMATION The INA220 is a digital current-shunt monitor with an Two-Wire and SMBus-compatible interface. It provides digital current, voltage, and power readings necessary for accurate decision-making in precisely-controlled systems. Programmable registers allow flexible configuration for measurement resolution, and continuous-versustriggered operation.
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INA220 SBOS459D – JUNE 2009 – REVISED SEPTEMBER 2010 www.ti.com Serial Interface The INA220 operates only as a slave device on the Two-Wire bus and SMBus. Connections to the bus are made via the open-drain I/O lines SDA and SCL. The SDA and SCL pins feature integrated spike suppression filters and Schmitt triggers to minimize the effects of input spikes and bus noise. The INA220 supports the transmission protocol for fast (1kHz to 400kHz) and high-speed (1kHz to 3.4MHz) modes.
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INA220 SBOS459D – JUNE 2009 – REVISED SEPTEMBER 2010 www.ti.
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INA220 SBOS459D – JUNE 2009 – REVISED SEPTEMBER 2010 www.ti.com ALERT 1 9 1 9 SCL SDA 0 0 0 1 1 0 0 1 R/W Start By Master 0 0 A3 A2 ACK By INA220 A1 A0 0 From INA220 Frame 1 SMBus ALERT Response Address Byte Frame 2 Slave Address Byte NACK By Master Stop By Master (1) NOTE (1): The value of the Slave Address Byte is determined by the settings of the A0 and A1 pins. Refer to Table 1. Figure 16.
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INA220 www.ti.com SBOS459D – JUNE 2009 – REVISED SEPTEMBER 2010 High-Speed Two-Wire Mode The master then generates a repeated start condition (a repeated start condition has the same timing as the start condition). After this repeated start condition, the protocol is the same as F/S mode, except that transmission speeds up to 3.4Mbps are allowed. Instead of using a stop condition, repeated start conditions should be used to secure the bus in HS-mode.
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INA220 SBOS459D – JUNE 2009 – REVISED SEPTEMBER 2010 www.ti.com Power-Up Conditions Power-up conditions apply to a software reset via the RST bit (bit 15) in the Configuration Register, or the Two-Wire bus General Call Reset. BASIC ADC FUNCTIONS The two analog inputs to the INA220, VIN+ and VIN–, connect to a shunt resistor in the bus of interest. Bus voltage is measured at VBUS pin. The INA220 is typically powered by a separate supply from +3V to +5.5V. The bus being sensed can vary from 0V to 26V.
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INA220 www.ti.com SBOS459D – JUNE 2009 – REVISED SEPTEMBER 2010 sampling rate (>1MHz). Filter using the lowest possible series resistance and ceramic capacitor. Recommended values are 0.1mF to 1.0mF. Figure 19 shows the INA220 with an additonal filter added at the input. available. Testing has demonstrated that the addition of 10Ω resistors in series with each input of the INA220 sufficiently protects the inputs against dV/dt failure up to the 26V rating of the INA220.
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INA220 SBOS459D – JUNE 2009 – REVISED SEPTEMBER 2010 www.ti.com PROGRAMMING THE INA220 POWER MEASUREMENT ENGINE Calibration Register and Scaling The Calibration Register makes it possible to set the scaling of the Current and Power Registers to whatever values are most useful for a given application.
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INA220 www.ti.com SBOS459D – JUNE 2009 – REVISED SEPTEMBER 2010 6. Calculate the Power LSB, using Equation 5. Equation 5 shows a general formula; because the bus voltage measurement LSB is always 4mV, the power formula reduces to the calculated result. Power_LSB = 20 Current_LSB Power_LSB = 400 ´ 10-6 (5) 7. Compute the maximum current and shunt voltage values (before overflow), as shown by Equation 6 and Equation 7.
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INA220 SBOS459D – JUNE 2009 – REVISED SEPTEMBER 2010 www.ti.com Figure 20 illustrates how to perform the same procedure discussed in this example using the automated INA220EVM software. Note that the same numbers used in the nine-step example are used in the software example in Figure 20. Also note that Figure 20 illustrates which results correspond to which step (for example, the information entered in Step 1 is enclosed in a box in Figure 20 and labeled).
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INA220 www.ti.com SBOS459D – JUNE 2009 – REVISED SEPTEMBER 2010 Calibration Example 2 (Overflow Possible) This design example uses the nine-step procedure for calibrating the INA220 where overflow is possible. Figure 21 illustrates how the same procedure is performed using the automated INA220EVM software. Note that the same numbers used in the nine-step example are used in the software example in Figure 21.
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INA220 SBOS459D – JUNE 2009 – REVISED SEPTEMBER 2010 www.ti.com 7. Compute the maximum current and shunt voltage values (before overflow), as shown by Equation 15 and Equation 16. Note that both Equation 15 and Equation 16 involve an If - then condition. Max_Current = Current_LSB ´ 32767 Max_Current = 0.
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INA220 www.ti.com SBOS459D – JUNE 2009 – REVISED SEPTEMBER 2010 Figure 21 illustrates how to perform the same procedure discussed in this example using the automated INA220EVM software. Note that the same numbers used in the nine-step example are used in the software example in Figure 21. Also note that Figure 21 illustrates which results correspond to which step (for example, the information entered in Step 1 is enclosed in a box in Figure 21 and labeled).
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INA220 SBOS459D – JUNE 2009 – REVISED SEPTEMBER 2010 www.ti.com CONFIGURE/MEASURE/CALCULATE EXAMPLE shunt voltage. By knowing the value of the shunt resistor, the device can then calculate the amount of current that created the measured shunt voltage drop. The first step when calculating the calibration value is setting the current LSB. The Calibration Register value is based on a calculation that has its precision capability limited by the size of the register and the Current Register LSB.
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INA220 www.ti.com SBOS459D – JUNE 2009 – REVISED SEPTEMBER 2010 The Current Register (04h) is then calculated by multiplying the shunt voltage contents by the Calibration Register and then dividing by 4095. For this example, the shunt voltage of 2000 is multiplied by the calibration register of 20480 and then divided by 4095 to yield a Current Register of 2712h.
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INA220 SBOS459D – JUNE 2009 – REVISED SEPTEMBER 2010 www.ti.com REGISTER INFORMATION The INA220 uses a bank of registers for holding configuration settings, measurement results, maximum/minimum limits, and status information. Table 3 summarizes the INA220 registers; Figure 13 illustrates the registers. Register contents are updated 4ms after completion of the write command.
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INA220 www.ti.com SBOS459D – JUNE 2009 – REVISED SEPTEMBER 2010 REGISTER DETAILS All INA220 registers 16-bit registers are actually two 8-bit bytes via the Two-Wire interface.
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INA220 SBOS459D – JUNE 2009 – REVISED SEPTEMBER 2010 www.ti.com SADC: SADC Shunt ADC Resolution/Averaging Bits 3–6 These bits adjust the Shunt ADC resolution (9-, 10-, 11-, or 12-bit) or set the number of samples used when averaging results for the Shunt Voltage Register (01h). BADC (Bus) and SADC (Shunt) ADC resolution/averaging and conversion time settings are shown in Table 5. Table 5.
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INA220 www.ti.com SBOS459D – JUNE 2009 – REVISED SEPTEMBER 2010 DATA OUTPUT REGISTERS Shunt Voltage Register 01h (Read-Only) The Shunt Voltage Register stores the current shunt voltage reading, VSHUNT. Shunt Voltage Register bits are shifted according to the PGA setting selected in the Configuration Register (00h). When multiple sign bits are present, they will all be the same value. Negative numbers are represented in twos complement format.
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INA220 SBOS459D – JUNE 2009 – REVISED SEPTEMBER 2010 www.ti.com Table 7. Shunt Voltage Register Format (1) VSHUNT Reading (mV) Decimal Value PGA = ÷ 8 (D15…..................D0) PGA = ÷ 4 (D15…..................D0) PGA = ÷ 2 (D15…..................D0) PGA = ÷ 1 (D15…..................D0) 320.02 32002 0111 1101 0000 0000 0011 1110 1000 0000 0001 1111 0100 0000 0000 1111 1010 0000 320.01 32001 0111 1101 0000 0000 0011 1110 1000 0000 0001 1111 0100 0000 0000 1111 1010 0000 320.
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INA220 www.ti.com SBOS459D – JUNE 2009 – REVISED SEPTEMBER 2010 Bus Voltage Register 02h (Read-Only) The Bus Voltage Register stores the most recent bus voltage reading, VBUS. At full-scale range = 32V (decimal = 8000, hex = 1F40), and LSB = 4mV.
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INA220 SBOS459D – JUNE 2009 – REVISED SEPTEMBER 2010 www.ti.com Current Register 04h (Read-Only) Full-scale range and LSB depend on the value entered in the Calibration Register. See the Programming the INA220 Power Measurement Engine section. Negative values are stored in Two's Complement format.
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INA220 www.ti.com SBOS459D – JUNE 2009 – REVISED SEPTEMBER 2010 ADDITIONAL APPLICATION IDEAS Figure 23, Figure 24, and Figure 25 show the INA220 in additional circuit configurations for current, voltage, and power monitoring applications. HCPL2300 0.1mF +3.3V to +5V 1/4W Zener or shunt reg 0.1mF 4.3kW 4.3kW 1W 10mF -48V Supply 8 1 7 2 6 3 5 4 SDA 0.1mF 35.7kW +5V HCPL2300 VBUS (Bus Voltage Input) VS (Supply Voltage) INA220 13.7kW 24V Tranzorb 0.1mF 1 8 2 7 3 6 4 5 4.
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INA220 SBOS459D – JUNE 2009 – REVISED SEPTEMBER 2010 www.ti.com CBYPASS 0.1mF +3.3V to +5V Bus Voltage Input VS (Supply Voltage) Load INA220 Battery ´ SDA Power Register DATA SCL CLK Shunt (40mV max for 12-bit) R2F R1F V VIN+ Current Register Two-Wire Interface ADC A0 A1 CF Voltage Register I VIN- Address Select GND Figure 25. General Source Low-Side Sensing space REVISION HISTORY NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 18-Oct-2013 Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties.
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PACKAGE MATERIALS INFORMATION www.ti.com 19-Nov-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant INA220AIDGSR VSSOP DGS 10 2500 330.0 12.4 5.3 3.3 1.3 8.0 12.0 Q1 INA220AIDGSR VSSOP DGS 10 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 INA220AIDGST VSSOP DGS 10 250 180.0 12.4 5.3 3.3 1.3 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 19-Nov-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) INA220AIDGSR VSSOP DGS 10 2500 370.0 355.0 55.0 INA220AIDGSR VSSOP DGS 10 2500 366.0 364.0 50.0 INA220AIDGST VSSOP DGS 10 250 195.0 200.0 45.0 INA220AIDGST VSSOP DGS 10 250 366.0 364.0 50.0 INA220BIDGSR VSSOP DGS 10 2500 370.0 355.0 55.0 INA220BIDGSR VSSOP DGS 10 2500 366.0 364.0 50.
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