INA3221

@@ -0,0 +1,60 @@+# INA3221++**Texas Instruments** · Current / power monitor · VQFN-16++Monitors current and bus voltage on three separate rails over I2C, each through its own external shunt, so one chip watches a whole supply tree. It reports shunt and bus voltage per channel from 0 to 26 V, and two open-drain alerts (warning and critical) trip against per-channel limits without host polling. Address pins allow several devices on one bus. A three-rail extension of the INA219 idea for multi-supply boards.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | IN-3 | input | Analog input. Connect to load side of the channel 3 shunt resistor. Bus voltage is the measurement from this pin to ground. Common-mode range 0V to 26V. |+| 2 | IN+3 | input | Analog input. Connect to supply side of the channel 3 shunt resistor. Common-mode range 0V to 26V. |+| 3 | GND | power_in | Analog ground reference for the device. |+| 4 | VS | power_in | Power supply, 2.7V to 5.5V. Bypass to GND with a 0.1µF ceramic capacitor. |+| 5 | A0 | input | Digital input. I2C/SMBus address select pin. Connect to GND, SCL, SDA, or VS to select one of four programmable device addresses (see Table 7-1). |+| 6 | SCL | input | I2C/SMBus serial clock line. Open-drain input; requires an external pull-up resistor (typ 10kΩ). |+| 7 | SDA | bidirectional | I2C/SMBus serial data line. Open-drain input/output; requires an external pull-up resistor (typ 10kΩ). |+| 8 | Warning | output | Averaged measurement warning alert. Open-drain digital output; requires an external pull-up resistor to VPU. |+| 9 | Critical | output | Conversion-triggered critical alert. Open-drain digital output; requires an external pull-up resistor to VPU. |+| 10 | PV | output | Power valid alert. Open-drain digital output; requires an external pull-up resistor to VPU. |+| 11 | IN-1 | input | Analog input. Connect to load side of the channel 1 shunt resistor. Bus voltage is the measurement from this pin to ground. Common-mode range 0V to 26V. |+| 12 | IN+1 | input | Analog input. Connect to supply side of the channel 1 shunt resistor. Common-mode range 0V to 26V. |+| 13 | TC | output | Timing control alert. Open-drain digital output; abs-max 26V. |+| 14 | IN-2 | input | Analog input. Connect to load side of the channel 2 shunt resistor. Bus voltage is the measurement from this pin to ground. Common-mode range 0V to 26V. |+| 15 | IN+2 | input | Analog input. Connect to supply side of the channel 2 shunt resistor. Common-mode range 0V to 26V. |+| 16 | VPU | power_in | Pull-up supply voltage used to bias the power valid (PV) output circuitry and typically the alert open-drain pull-ups. |+| 17 | Thermal Pad | passive | Exposed thermal pad on package bottom. Must be connected to ground or left floating. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | 3-channel current / bus-voltage monitor |+| Channels | 3 (external shunts) |+| Bus voltage | 0-26 V |+| Interface | I2C / SMBus |+| Alerts | Warning + critical (open-drain) |+| Supply | 2.7-5.5 V |+| Package | VQFN-16 |++## Ordering variants++- `INA3221AIRGVR (VQFN-16)`+- `INA3221AIRGVT (VQFN-16, small reel)`++## CAD (KiCad official)++- Symbol: `Power_Management:INA3221 (KiCad official)`+- Footprint: `Package_DFN_QFN:Texas_RGV0016A_VQFN-16-1EP_4x4mm_P0.65mm_EP2.1x2.1mm`+- 3D model: VQFN-16 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/ina3221.pdf) (50 pp, sha256 `01dd1c52a7675638`, retrieved 2026-08-17, tier: manufacturer)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/ina3221-datasheet.pdf)

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