# SD8224C-4

**SHOUDING** · Touch Sensors · SOP-16

SD8224C-4 from SHOUDING, in a SOP-16. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | TP0 | bidirectional | Touch input port for key 0; sensitivity is adjusted with an external capacitor Cs0 of 1 to 50pF. |
| 2 | TP1 | bidirectional | Touch input port for key 1; sensitivity is adjusted with an external capacitor Cs1 of 1 to 50pF. |
| 3 | TP2 | bidirectional | Touch input port for key 2; sensitivity is adjusted with an external capacitor Cs2 of 1 to 50pF. |
| 4 | TP3 | bidirectional | Touch input port for key 3; sensitivity is adjusted with an external capacitor Cs3 of 1 to 50pF. |
| 5 | AHLB | input | Selects active-high or active-low output level (CMOS input with pull-down, default 0 = active high). |
| 6 | VDD | power_in | Positive supply voltage, 2.4V to 5.5V with internal regulator and LVR enabled (2.0V to 5.5V with them disabled). |
| 7 | TOG | input | Selects toggle (trigger) output mode versus direct output mode (CMOS input with pull-down, default 0). |
| 8 | LPMB | input | Selects fast mode (tied to VDD) or low-power mode (floating or tied to VSS, default 0). |
| 9 | MOT0 | input | Maximum key output time select bit 0 with MOT1: 120s, 64s, 16s or infinite (CMOS input with pull-up, default 1). |
| 10 | VSS | power_in | Negative supply voltage, ground. |
| 11 | OD | input | Selects open-drain output when 0 (CMOS input with pull-up, default 1 = CMOS output). |
| 12 | SM | input | Selects multi-key output (1, default) or single-key output (0) (CMOS input with pull-up). |
| 13 | TPQ3 | output | Direct output port corresponding to touch input TP3. |
| 14 | TPQ2 | output | Direct output port corresponding to touch input TP2. |
| 15 | TPQ1 | output | Direct output port corresponding to touch input TP1. |
| 16 | TPQ0 | output | Direct output port corresponding to touch input TP0. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | SHOUDING |
| Package | SOP-16 |
| Category | Sensors |
| Pins | 16 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Operating temperature | Top | -40 |  | 85 | °C |  | 8 |
| Storage temperature | TSTG | -50 |  | 125 | °C |  | 8 |
| Supply voltage | VDD | -0.3 |  | 6 | V | relative to VSS | 8 |
| Input voltage | VIN | -0.3 |  | 0.3 | V | VSS-0.3 to VDD+0.3 (max is VDD+0.3) | 8 |
| Operating voltage (internal regulator/LVR disabled) | VDD | 2 |  | 5.5 | V | internal regulator/LVR disabled; TA=25°C | 8 |
| Operating voltage (internal regulator/LVR enabled) | VDD | 2.4 |  | 5.5 | V | internal regulator/LVR enabled; TA=25°C | 8 |
| Internal regulator output | VREG | 2.1 | 2.2 | 2.3 | V |  | 8 |
| Internal LVR threshold | LVR | 2.2 | 2.3 | 2.4 | V |  | 8 |
| Operating current, low-power mode (1) | Iop1 |  | 4.5 | 6.8 | uA | VDD=3V low-power mode | 8 |
| Operating current, low-power mode (2) | Iop1 |  | 4 | 6 | uA | VDD=3V low-power mode | 8 |
| Operating current, fast mode, regulator and LVR enabled | Iop1 |  | 22 | 33 | uA | VDD=3V fast mode, internal regulator enabled, LVR enabled | 8 |
| Operating current, fast mode, regulator enabled, LVR disabled | Iop1 |  | 20 | 30 | uA | VDD=3V fast mode, internal regulator enabled, LVR disabled | 8 |
| Input low voltage | VIL | 0 |  | 0.2 | VDD |  | 8 |
| Input high voltage | VIH | 0.8 |  | 1 | VDD |  | 8 |
| Output sink current | IOL |  | 8 |  | mA | VDD=3V, VOL=0.6V | 8 |
| Output source current | IOH |  | -4 |  | mA | VDD=3V, VOH=2.4V | 8 |
| Input pull-up resistance | RPH |  | 30 |  | kohm | VDD=3V | 8 |
| Input pull-down resistance | RPL |  | 25 |  | kohm | VDD=3V | 8 |
| Key response time, fast mode | TR |  | 60 |  | mS | VDD=3V, fast mode | 8 |
| Key response time, low-power mode | TR |  | 160 |  | mS | VDD=3V, low-power mode | 8 |

## CAD (KiCad official)

- Symbol: `SD8224C-4`
- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`
- 3D model: SOP-16 (KiCad packages3D, STEP)
- 3D model files: `sd8224c-4-etched.step` / `sd8224c-4-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sd8224c-4.step` / `sd8224c-4.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [SHOUDING datasheet](docs/sd8224c-4-datasheet.pdf) (11 pp, sha256 `d1cbf6e89d56e892`, retrieved 2026-10-22, 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:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/sd8224c-4-datasheet.pdf)