# CY8C20055-24LKXI

**Cypress Semicon** · Microcontroller Units (MCUs/MPUs/SOCs) · QFN-16(3x3)

CY8C20055-24LKXI from Cypress Semicon, in a QFN-16(3x3). 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 | P2[5] | bidirectional | General purpose digital I/O with analog input capability; also XTAL Out. |
| 2 | P2[3] | bidirectional | General purpose digital I/O with analog input capability; also XTAL In. |
| 3 | P1[7] | bidirectional | 5 mA high-drive, regulated-output-option I/O with analog input; I2C SCL (SPI SS is not available in CY8C20055). |
| 4 | P1[5] | bidirectional | 5 mA high-drive, regulated-output-option I/O with analog input; I2C SDA (SPI MISO is not available in CY8C20055). |
| 5 | P1[3] | bidirectional | 5 mA high-drive, regulated-output-option I/O with analog input; SPI CLK (not available in CY8C20055). |
| 6 | P1[1] | bidirectional | 5 mA high-drive, regulated-output-option I/O with analog input; ISSP clock pin (not High Z at POR), I2C SCL, SPI MOSI (SPI not available in CY8C20055). |
| 7 | Vss | power_in | Ground pin. |
| 8 | P1[0] | bidirectional | 5 mA high-drive, regulated-output-option I/O with analog input; ISSP data pin (not High Z at POR), I2C SDA, SPI CLK (SPI not available in CY8C20055). |
| 9 | P1[2] | bidirectional | 5 mA high-drive, regulated-output-option I/O with analog input. |
| 10 | P1[4] | bidirectional | 5 mA high-drive, regulated-output-option I/O with analog input; optional external clock EXTCLK. |
| 11 | XRES | input | Active high external reset with internal pull down. |
| 12 | P0[4] | bidirectional | 5 mA high-drive I/O with analog input. |
| 13 | Vdd | power_in | Power pin. |
| 14 | P0[7] | bidirectional | 5 mA high-drive I/O with analog input. |
| 15 | P0[3] | bidirectional | 5 mA high-drive I/O with analog input; integrating input. |
| 16 | P0[1] | bidirectional | 5 mA high-drive I/O with analog input; integrating input. |
| 17 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Cypress Semicon |
| Package | QFN-16(3x3) |
| Category | Single Chip Microcomputer/Microcontroller |
| Pins | 17 |

## CAD (KiCad official)

- Symbol: `CY8C20055-24LKXI`
- Footprint: `Package_DFN_QFN:QFN-16-1EP_3x3mm_P0.5mm_EP1.7x1.7mm`
- 3D model: QFN-16(3x3) (KiCad packages3D, STEP)
- 3D model files: `cy8c20055-24lkxi-etched.step` / `cy8c20055-24lkxi-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cy8c20055-24lkxi.step` / `cy8c20055-24lkxi.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Cypress Semicon datasheet](https://www.infineon.com/dgdl/Infineon-PSOC_CY8C20XX7_S_CY8C20055_TECHNICAL_REFERENCE_MANUAL_(TRM)-AdditionalTechnicalInformation-v03_00-EN.pdf?fileId=8ac78c8c7d0d8da4017d0f90fbf67e30&utm_source=cypress&utm_medium=referral&utm_campaign=202110_globe_en_all) (275 pp, sha256 `c61db78d674ccf72`, retrieved 2026-10-27, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text), consensus `claude-sonnet-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/cy8c20055-24lkxi-datasheet.pdf)