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Texas Instruments INA3221AQRGVRQ1
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- Part No.:
- INA3221AQRGVRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Current Regulation/Management
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
INA3221AQRGVRQ1.pdf
- Description:
- IC CURRENT/VOLT MON 0.25% 16VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,778
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Product details
Overview
INA3221AQRGVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 (–40 °C to +125 °C) triple-channel current and bus voltage monitor IC with I²C/SMBus interface, ±80 µV shunt offset, 0.25% gain error, and 26-V common-mode input range - used for real-time rail monitoring in automotive infotainment and digital cluster power systems.
For engineers reviewing the INA3221AQRGVRQ1 datasheet, INA3221AQRGVRQ1 pinout, INA3221AQRGVRQ1 application, or INA3221AQRGVRQ1 equivalent, key selection criteria include triple-channel independent alerting, programmable averaging, four I²C addresses, 13-bit ADC resolution, and functional safety documentation support.
Technical Context
The INA3221AQRGVRQ1 integrates three independent high-side current-sense channels with simultaneous shunt and bus voltage measurement per channel, using a single 13-bit successive-approximation ADC with configurable conversion time (140 µs to 9.07 ms) and averaging (1× to 1024×). Each channel supports separate critical/warning limit registers and open-drain alert outputs.
Its architecture enables concurrent monitoring of up to three 0–26 V power rails while operating from a 2.7–5.5 V supply, drawing only 350 µA typical quiescent current. The device implements power-valid sequencing logic, summation-based critical alerts, and SMBus timeout recovery (28–35 ms), all compliant with automotive functional safety requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 3 independent high-side current & bus voltage sensing channels |
| ADC Resolution | 13-bit native resolution; 40 µV LSB for shunt, 8 mV LSB for bus voltage |
| Common-Mode Range | 0 V to 26 V - supports direct monitoring of 12 V/24 V automotive rails without level-shifting |
| Shunt Offset Error | ±80 µV max - enables accurate low-current sensing with 1 mΩ shunts down to ~80 mA |
| Gain Error | 0.25% max - ensures <±3.2 mV absolute error on 1.28 V full-scale shunt range |
| Supply Voltage | 2.7 V to 5.5 V - compatible with standard 3.3 V or 5 V microcontroller I/O domains |
| Quiescent Current | 350 µA typ - enables always-on monitoring in battery-sensitive automotive modules |
Pinout & Package
VQFN-16 (RGV) package, 4.00 mm × 4.00 mm, 0.5-mm pitch, thermally enhanced bottom-exposed pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+1, IN−1 IN+2, IN−2 IN+3, IN−3 | Differential analog inputs per channel | Connect across shunt resistor (IN+ to supply side, IN− to load side); measure both shunt ΔV and bus VIN− vs GND |
| VS | Analog power supply | 2.7–5.5 V device supply; powers internal circuitry and ADC - independent of monitored rail voltages |
| GND | Analog ground reference | Return path for internal analog circuits and ADC; must be connected to system power ground |
| SDA, SCL | I²C/SMBus bidirectional interface | Open-drain, 3.3 V-compatible data/clock lines; support up to 400 kHz standard-mode operation |
| A0 | I²C address select | Configures one of four slave addresses (GND, VS, SCL, or SDA) - enables multiple devices on same bus |
| Critical, Warning, PV, TC | Open-drain alert outputs | Assert low on programmable threshold violations: per-channel critical/warning, power-valid status, timing control flag |
| VPU | Power-valid pull-up supply | Bias voltage for PV output stage; typically tied to same rail as VS or monitored bus |
Key Features
| Feature | Design Value |
|---|---|
| Triple-channel independent monitoring | Enables simultaneous tracking of three distinct power domains (e.g., display, audio, MCU core) without external multiplexing |
| Programmable averaging (1×–1024×) | Reduces noise-induced false alerts in noisy automotive environments while maintaining responsiveness via adjustable conversion time |
| Power-valid sequencing logic | Verifies all enabled rails exceed upper threshold (default 10 V) before asserting PV high, then monitors lower threshold (default 9 V) for brownout detection |
| Shunt-voltage summation mode | Combines readings from selected channels into single sum register - supports total current estimation when identical shunt values are used |
| Functional safety documentation | Includes FIT rate, failure modes, diagnostic coverage analysis - accelerates ISO 26262 ASIL-B system integration |
Applications
| Infotainment Power Monitoring | Rear-Seat Entertainment |
|---|---|
Use Scenario: Real-time current draw monitoring across head-unit processor, display backlight, and audio amplifier rails. IC Role / Device Role / Timing Role: Triple-channel high-side current/voltage sensor with independent alerting per rail and I²C reporting to host MCU. Use Value: Enables dynamic thermal throttling and fault isolation without adding discrete sense resistors or op-amps per rail. | Use Scenario: Detecting overcurrent events in seat-mounted displays, wireless streaming modules, and USB-C charging ports. IC Role / Device Role / Timing Role: Bus voltage and shunt current monitor with programmable warning thresholds and 13-bit resolution for low-power standby detection. Use Value: Reduces BOM count by replacing three separate current-sense ICs while providing coordinated alert signaling via Critical/Warning pins. |
| Digital Instrument Clusters | Automotive ECU Power Management |
Use Scenario: Validating stable 5 V, 3.3 V, and 1.2 V supplies powering TFT controller, graphics processor, and CAN transceiver. IC Role / Device Role / Timing Role: Power-valid sequencer with upper/lower bus voltage limits and timing control alert for synchronization with boot firmware. Use Value: Ensures safe boot sequence by holding system reset until all rails meet thresholds - eliminates need for external supervisor ICs. | Use Scenario: Monitoring power integrity across engine control, transmission, and ADAS domain controllers during cold-cranking. IC Role / Device Role / Timing Role: High-accuracy (±80 µV offset), wide common-mode (0–26 V) current sensor with AEC-Q100 Grade 1 qualification. Use Value: Supports robust diagnostics under extreme temperature cycling and supply transients - meets ASIL-B functional safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current and voltage monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA226AQDGSRQ1 | Higher accuracy (±0.1% gain error), 16-bit resolution, but no power-valid alert or summation mode | Preferred for precision power budgeting; lacks integrated rail sequencing logic | Select when absolute measurement fidelity outweighs multi-rail coordination features |
| INA220AQDGSRQ1 | Bidirectional sensing, zero-drift architecture, but single-channel only and no bus voltage reporting | Suited for motor current feedback; cannot replace triple-rail monitoring without additional ICs | Choose only for unidirectional or bidirectional current-only use cases requiring drift-free performance |
Compared with INA226AQDGSRQ1 and INA220AQDGSRQ1, the INA3221AQRGVRQ1 uniquely delivers triple-channel bus voltage + shunt current monitoring with integrated power sequencing, summation logic, and four I²C addresses - making it optimal for compact, multi-rail automotive subsystems where space and firmware overhead are constrained.
Availability
INA3221AQRGVRQ1 is available at Aetrix Electronics and suitable for automotive infotainment systems, digital instrument clusters, and electronic control units requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for INA3221AQRGVRQ1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with deep expertise in automotive-grade signal conditioning and power management solutions.
The INA3221-Q1 product line was designed specifically for AEC-Q100-compliant multi-rail power monitoring in automotive cockpit electronics, emphasizing functional safety readiness, thermal robustness, and I²C-system integration efficiency.
FAQ
What is the maximum common-mode voltage the INA3221AQRGVRQ1 can measure?
The INA3221AQRGVRQ1 supports a common-mode input voltage range of 0 V to 26 V on each channel's IN+ and IN− pins. This allows direct monitoring of 12 V and 24 V automotive battery rails without external level-shifting circuitry. Absolute maximum ratings specify –0.3 V to +26 V per pin, and differential voltage must remain within ±26 V. Exceeding 26 V risks permanent damage.
Does the INA3221AQRGVRQ1 support bidirectional current sensing?
No, the INA3221AQRGVRQ1 is configured for unidirectional high-side current sensing only. It measures positive shunt voltage drops (IN+ > IN−) corresponding to current flow from supply to load. For bidirectional applications - such as regenerative braking or H-bridge motor control - TI recommends alternatives like the INA220AQDGSRQ1 or INA226AQDGSRQ1, which explicitly support bidirectional measurement with zero-drift or higher-resolution architectures.
How many I²C addresses does the INA3221AQRGVRQ1 support, and how are they configured?
The INA3221AQRGVRQ1 supports four unique I²C slave addresses, selected via the A0 pin. A0 may be tied to GND, VS, SCL, or SDA to configure addresses 0x40, 0x41, 0x44, or 0x45 respectively. This enables up to four INA3221AQRGVRQ1 devices on a single I²C bus without address conflict - essential for complex automotive modules requiring redundant or distributed rail monitoring.
What is the purpose of the VPU pin on the INA3221AQRGVRQ1?
The VPU pin on the INA3221AQRGVRQ1 supplies bias voltage to the internal circuitry driving the open-drain Power Valid (PV) output. It must be connected to a stable voltage source - typically the same as VS or the highest monitored bus rail - to ensure correct logic-level assertion of the PV signal. Leaving VPU floating or connecting it to an unstable node may cause erratic PV behavior or failure to assert high when all rails meet thresholds.
Can the INA3221AQRGVRQ1 operate with a 2.5 V supply voltage?
No, the INA3221AQRGVRQ1 requires a minimum supply voltage of 2.7 V on the VS pin, as specified in the Recommended Operating Conditions table. Operation below 2.7 V may result in undefined behavior, incomplete ADC conversions, or failure to assert alert outputs reliably. The power-on reset threshold is 2.0 V, but functional operation is only guaranteed from 2.7 V to 5.5 V - so 2.5 V is outside the valid operating range.
INA3221AQRGVRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-VQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Current/Voltage Monitor
- Sensing Method:
- High/Low-Side
- Accuracy:
- ±0.25%
- Voltage - Input:
- 0V ~ 26V
- Current - Output:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-VQFN (4x4)
INA3221AQRGVRQ1 FAQ
1.How can I place an order for INA3221AQRGVRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA3221AQRGVRQ1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for INA3221AQRGVRQ1 reliable?
The price and inventory of INA3221AQRGVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA3221AQRGVRQ1 is usually 5 days.
3.What payment methods are accepted for INA3221AQRGVRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA3221AQRGVRQ1 transactions.
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4.How is shipping managed for INA3221AQRGVRQ1?
INA3221AQRGVRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA3221AQRGVRQ1 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for INA3221AQRGVRQ1?
For technical support, including INA3221AQRGVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA3221AQRGVRQ1 requirements.
6.How does Aetrix verify that INA3221AQRGVRQ1 is sourced from the original manufacturer or authorized distributors?
All INA3221AQRGVRQ1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that INA3221AQRGVRQ1 meets industry standards.
7.What is the process for return or replacement of INA3221AQRGVRQ1?
All INA3221AQRGVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with INA3221AQRGVRQ1, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The INA3221AQRGVRQ1 part is unused and in its original packaging.
Return procedure for INA3221AQRGVRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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