# TM7780

**TM Shenzhen Titan Micro Elec** · Energy Metering · SOP-8

TM7780 from TM Shenzhen Titan Micro Elec, in a SOP-8. 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 | VDD | power_in | Positive supply. Recommended 4.5-5.5 V (typ 5.0 V). Brown-out reset asserts below ~4.0 V (release ~4.3 V). Decouple with 0.1 µF + 10 µF to GND. |
| 2 | VAP | input | Current-channel differential positive input. Full-scale differential range ±43.75 mV peak between VAP/VAN. Equivalent input impedance ≈500 kΩ; input cap ≈6.4 pF. Absolute limits -2 V to +2 V. |
| 3 | VAN | input | Current-channel differential negative input. Paired with VAP; ±43.75 mV peak differential full-scale. Absolute limits -2 V to +2 V. |
| 4 | VBP | input | Voltage-channel single-ended positive input. Full-scale input range ±700 mV peak. Equivalent input impedance ≈6 MΩ. Typically driven from mains via resistor divider (e.g. 6×470 kΩ + 1 kΩ) with 0.1 µF to GND. |
| 5 | GND | power_in | Negative supply / system ground reference for all analog and digital signals. |
| 6 | CF | output | Active-power pulse output. Frequency proportional to real power: F_CF = (V1·V2·48 / V_REF²)·(f_CLK/128). 50% duty cycle. VOH ≥ VDD−0.5 V at Iout=5 mA; VOL ≤ 0.5 V at Iout=−5 mA. ±0.2% accuracy (IEC 687/1036). |
| 7 | CFA | output | RMS output pulse - selectable via SET: SET=GND outputs RMS current (F_CFAI = (V1·24/V_REF)·(f_CLK/512)); SET=VDD outputs RMS voltage (F_CFAU = (V2·2/V_REF)·(f_CLK/512)). ±0.5% accuracy, 50% duty cycle. |
| 8 | SET | input | Mode-select input with internal pull-down. Selects CFA output content: tie to GND (or leave floating - internal pull-down) for RMS current on CFA; tie to VDD for RMS voltage on CFA. VIH ≥ 0.8·VDD, VIL ≤ 0.8 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TM Shenzhen Titan Micro Elec |
| Package | SOP-8 |
| Category | Data Acquisition |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `TM7780`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `tm7780-etched.step` / `tm7780-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tm7780.step` / `tm7780.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [TM Shenzhen Titan Micro Elec datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589835776403148800) (5 pp, sha256 `9ab222968c46653d`, 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/tm7780-datasheet.pdf)