ATT7022EU-N

@@ -0,0 +1,88 @@+# ATT7022EU-N++**HiTrend Tech Shanghai** · Energy Metering · LQFP-44(10x10)++ATT7022EU-N from HiTrend Tech Shanghai, in a LQFP-44(10x10). Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | Reset | input | External reset input, active-low, Schmitt-trigger. Internal 47 kΩ pull-up. |+| 2 | IRQ | output | Interrupt output. After power-on reset IRQ goes low; goes high after calibration parameters are written. When an enabled interrupt event occurs IRQ is driven low; goes high again after the interrupt-flag register is read. |+| 3 | V1P | input | Channel 1 (current channel) positive analog input. Fully differential, max signal ±0.7 Vp. Channel 1 has a PGA (gain set via register). ESD protection on-die. |+| 4 | V1N | input | Channel 1 (current channel) negative analog input. Fully differential pair with V1P, max signal ±0.7 Vp. Channel 1 has a PGA (gain set via register). |+| 5 | REFCAP | passive | 1.2 V internal voltage reference bypass / external drive point. Decouple with 10 µF in parallel with 0.1 µF ceramic. |+| 6 | V3P | input | Channel 3 (current channel) positive analog input. Fully differential, max ±0.7 Vp. PGA present, gain set via register. ESD-protected. |+| 7 | V3N | input | Channel 3 (current channel) negative analog input. Pair with V3P, max ±0.7 Vp. |+| 8 | AGND | power_in | Analog ground reference for the ADCs and reference source. Tie to the PCB analog ground plane. |+| 9 | V5P | input | Channel 5 (current channel) positive analog input. Fully differential, max ±0.7 Vp. Has PGA with programmable gain. |+| 10 | V5N | input | Channel 5 (current channel) negative analog input. Pair with V5P, max ±0.7 Vp. |+| 11 | AGND | power_in | Analog ground reference for the ADCs and reference source. |+| 12 | AVCC | power_in | Analog supply. Nominal 3.3 V ±10%. Decouple with 10 µF and 0.1 µF ceramic close to the pin. |+| 13 | V2P | input | Channel 2 (voltage channel) positive analog input. Fully differential, max ±0.7 Vp. ESD-protected. |+| 14 | V2N | input | Channel 2 (voltage channel) negative analog input. Pair with V2P, max ±0.7 Vp. |+| 15 | AGND | power_in | Analog ground reference for the ADCs and reference source. |+| 16 | V4P | input | Channel 4 (voltage channel) positive analog input. Fully differential, max ±0.7 Vp. ESD-protected. |+| 17 | V4N | input | Channel 4 (voltage channel) negative analog input. Pair with V4P, max ±0.7 Vp. |+| 18 | AVCC | power_in | Analog supply (second pin). Nominal 3.3 V ±10%. Decouple with 10 µF and 0.1 µF ceramic. |+| 19 | V6P | input | Channel 6 (voltage channel) positive analog input. Fully differential, max ±0.7 Vp. ESD-protected. |+| 20 | V6N | input | Channel 6 (voltage channel) negative analog input. Pair with V6P, max ±0.7 Vp. |+| 21 | V0P | input | Channel 0 (voltage channel) positive analog input. Fully differential, max ±0.7 Vp. ESD-protected. Note: on ATT7026E/ATT7028E this pin is NC. |+| 22 | V0N | input | Channel 0 (voltage channel) negative analog input. Pair with V0P. NC on ATT7026E/ATT7028E. |+| 23 | GND | power_in | Digital ground. |+| 24 | TEST | input | Factory test pin. Must be tied to ground in the application. |+| 25 | NC | unconnected | No connect. |+| 26 | SEL | input | Three-phase three-wire (low) / three-phase four-wire (high) mode select, Schmitt-trigger. Internal pull-up (~300 kΩ) programmable, or floating. |+| 27 | CF1 | output | Frequency (high-going pulse) output for active-power calibration; can also be used for active-energy metering. |+| 28 | CF2 | output | Frequency (high-going pulse) output for reactive-power calibration; can also be used for reactive-energy metering. |+| 29 | NC | unconnected | No connect. |+| 30 | CF3 | output | Frequency (high-going pulse) output for apparent-power calibration; can also be used for apparent-energy metering. NC on ATT7028E. |+| 31 | CF4 | output | Frequency (high-going pulse) output for fundamental active-power calibration; can also be used for fundamental active-energy metering. NC on ATT7026E/ATT7028E. |+| 32 | SLEEP | input | Sleep-mode control, active high. Drive high to enter sleep mode (~1 µA); drive low for normal operation. |+| 33 | GND | power_in | Digital ground. |+| 34 | VCC | power_in | Digital supply. Nominal 3.3 V ±5%. Decouple with 10 µF in parallel with 100 nF ceramic. |+| 35 | CS | input | SPI chip-select from the host MCU, active-low, Schmitt-trigger. When CS is high, DOUT is high-impedance. Internal ~300 kΩ pull-up (programmable) or floating. |+| 36 | SCLK | input | SPI serial clock, driven by the host MCU. Schmitt-trigger input suitable for opto-isolated drive. Internal ~300 kΩ pull-up (programmable) or floating. |+| 37 | DIN | input | SPI serial data input from the host MCU. Data is latched on the falling edge of SCLK. Schmitt-trigger. Internal ~300 kΩ pull-up (programmable) or floating. |+| 38 | DOUT | tri_state | SPI serial data output. Data is presented on the rising edge and valid on the falling edge of SCLK. High-Z when CS is high. |+| 39 | VDD | power_out | 1.8 V internal digital LDO output. Decouple with a 10 µF tantalum in parallel with 100 nF ceramic; do not load externally beyond decoupling. |+| 40 | REVP | output | Logic output that goes high whenever any phase has negative power; returns low once all three phases are positive again. |+| 41 | VCC | power_in | Digital supply (second pin). Nominal 3.3 V ±5%. Decouple with 10 µF in parallel with 100 nF ceramic. |+| 42 | OSCI | input | System crystal input, or external clock input. Recommended crystal 5.5296 MHz. On-chip oscillator startup circuit with ~10 MΩ feedback resistor. |+| 43 | OSCO | output | System crystal output. Connects to the other crystal terminal. |+| 44 | GND | power_in | Digital ground. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | HiTrend Tech Shanghai |+| Package | LQFP-44(10x10) |+| Category | Data Acquisition |+| Pins | 44 |++## Ordering variants++Same part, different packaging or reel option.++- `ATT7022EU-N`+- `ATT7026E`+- `ATT7028E`++## CAD (KiCad official)++- Symbol: `ATT7022EU-N`+- Footprint: `Package_QFP:LQFP-44_10x10mm_P0.8mm`+- 3D model: LQFP-44(10x10) (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [HiTrend Tech Shanghai datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586176339389403136) (68 pp, sha256 `cbbc53f2f4b7e6fc`, retrieved 2026-08-17, tier: lcsc)+- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.+- **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/att7022eu-n-datasheet.pdf)