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EFM8BB21F16I-C-QFN20R
Public Made by Adomby adom
SKYWORKS SILICON LABS Microcontrollers (MCU/MPU/SOC), QFN-20-EP(3x3). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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EFM8BB21F16I-C-QFN20R
SKYWORKS SILICON LABS · Microcontrollers (MCU/MPU/SOC) · QFN-20-EP(3x3)
EFM8BB21F16I-C-QFN20R from SKYWORKS SILICON LABS, in a QFN-20-EP(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 | P0.1 | bidirectional | Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P0MAT.1, INT0.1, INT1.1, ADC0.1, CMP0P.1, CMP0N.1 and AGND. |
| 2 | P0.0 | bidirectional | Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P0MAT.0, INT0.0, INT1.0, ADC0.0, CMP0P.0, CMP0N.0 and VREF. |
| 3 | GND | power_in | Ground reference for the device. |
| 4 | VDD | power_in | Supply power input; the single supply is specified for 2.2 to 3.6 V on this QFN20 part, which has no 5 V regulator option. |
| 5 | RSTb / C2CK | input | Active-low reset input shared with the C2 debug clock (C2CK). |
| 6 | P2.0 / C2D | bidirectional | Multifunction I/O with crossbar capability, 5 V tolerant under bias; shared with the C2 debug data pin (C2D) and carries P2MAT.0, ADC0.20, CMP1P.9 and CMP1N.9. |
| 7 | P1.6 | bidirectional | Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P1MAT.6, ADC0.14, CMP1P.6 and CMP1N.6. |
| 8 | P1.5 | bidirectional | Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P1MAT.5, ADC0.13, CMP1P.5 and CMP1N.5. |
| 9 | P1.4 | bidirectional | Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P1MAT.4, ADC0.12, CMP1P.4 and CMP1N.4. |
| 10 | P1.3 | bidirectional | Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P1MAT.3, I2C0_SCL, ADC0.11, CMP1P.3 and CMP1N.3. |
| 11 | P1.2 | bidirectional | Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P1MAT.2, I2C0_SDA, ADC0.10, CMP1P.2 and CMP1N.2. |
| 12 | GND | power_in | Ground reference for the device. |
| 13 | P1.1 | bidirectional | Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P1MAT.1, ADC0.9, CMP1P.1, CMP1N.1, CMP0P.10 and CMP0N.10. |
| 14 | P1.0 | bidirectional | Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P1MAT.0, ADC0.8, CMP1P.0, CMP1N.0, CMP0P.9 and CMP0N.9. |
| 15 | P0.7 | bidirectional | Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P0MAT.7, INT0.7, INT1.7, ADC0.7, CMP0P.7 and CMP0N.7. |
| 16 | P0.6 | bidirectional | Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P0MAT.6, CNVSTR, INT0.6, INT1.6, ADC0.6, CMP0P.6 and CMP0N.6. |
| 17 | P0.5 | bidirectional | Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P0MAT.5, INT0.5, INT1.5, UART0_RX, ADC0.5, CMP0P.5 and CMP0N.5. |
| 18 | P0.4 | bidirectional | Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P0MAT.4, INT0.4, INT1.4, UART0_TX, ADC0.4, CMP0P.4 and CMP0N.4. |
| 19 | P0.3 | bidirectional | Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P0MAT.3, EXTCLK, INT0.3, INT1.3, ADC0.3, CMP0P.3 and CMP0N.3. |
| 20 | P0.2 | bidirectional | Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P0MAT.2, INT0.2, INT1.2, ADC0.2, CMP0P.2 and CMP0N.2. |
| 21 | GND | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | SKYWORKS SILICON LABS |
| Package | QFN-20-EP(3x3) |
| Category | Embedded Processors & Controllers |
| Pins | 21 |
CAD (KiCad official)
- Symbol:
EFM8BB21F16I-C-QFN20R - Footprint:
Package_DFN_QFN:UQFN-20-1EP_3x3mm_P0.4mm_EP1.85x1.85mm - 3D model: QFN-20-EP(3x3) (KiCad packages3D, STEP)
- 3D model files:
efm8bb21f16i-c-qfn20r-etched.step/efm8bb21f16i-c-qfn20r-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);efm8bb21f16i-c-qfn20r.step/efm8bb21f16i-c-qfn20r.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: SKYWORKS SILICON LABS datasheet (59 pp, sha256
68db19b3e729b537, retrieved 2026-10-09, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-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).
# EFM8BB21F16I-C-QFN20R
**SKYWORKS SILICON LABS** · Microcontrollers (MCU/MPU/SOC) · QFN-20-EP(3x3)
EFM8BB21F16I-C-QFN20R from SKYWORKS SILICON LABS, in a QFN-20-EP(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 | P0.1 | bidirectional | Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P0MAT.1, INT0.1, INT1.1, ADC0.1, CMP0P.1, CMP0N.1 and AGND. |
| 2 | P0.0 | bidirectional | Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P0MAT.0, INT0.0, INT1.0, ADC0.0, CMP0P.0, CMP0N.0 and VREF. |
| 3 | GND | power_in | Ground reference for the device. |
| 4 | VDD | power_in | Supply power input; the single supply is specified for 2.2 to 3.6 V on this QFN20 part, which has no 5 V regulator option. |
| 5 | RSTb / C2CK | input | Active-low reset input shared with the C2 debug clock (C2CK). |
| 6 | P2.0 / C2D | bidirectional | Multifunction I/O with crossbar capability, 5 V tolerant under bias; shared with the C2 debug data pin (C2D) and carries P2MAT.0, ADC0.20, CMP1P.9 and CMP1N.9. |
| 7 | P1.6 | bidirectional | Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P1MAT.6, ADC0.14, CMP1P.6 and CMP1N.6. |
| 8 | P1.5 | bidirectional | Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P1MAT.5, ADC0.13, CMP1P.5 and CMP1N.5. |
| 9 | P1.4 | bidirectional | Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P1MAT.4, ADC0.12, CMP1P.4 and CMP1N.4. |
| 10 | P1.3 | bidirectional | Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P1MAT.3, I2C0_SCL, ADC0.11, CMP1P.3 and CMP1N.3. |
| 11 | P1.2 | bidirectional | Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P1MAT.2, I2C0_SDA, ADC0.10, CMP1P.2 and CMP1N.2. |
| 12 | GND | power_in | Ground reference for the device. |
| 13 | P1.1 | bidirectional | Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P1MAT.1, ADC0.9, CMP1P.1, CMP1N.1, CMP0P.10 and CMP0N.10. |
| 14 | P1.0 | bidirectional | Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P1MAT.0, ADC0.8, CMP1P.0, CMP1N.0, CMP0P.9 and CMP0N.9. |
| 15 | P0.7 | bidirectional | Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P0MAT.7, INT0.7, INT1.7, ADC0.7, CMP0P.7 and CMP0N.7. |
| 16 | P0.6 | bidirectional | Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P0MAT.6, CNVSTR, INT0.6, INT1.6, ADC0.6, CMP0P.6 and CMP0N.6. |
| 17 | P0.5 | bidirectional | Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P0MAT.5, INT0.5, INT1.5, UART0_RX, ADC0.5, CMP0P.5 and CMP0N.5. |
| 18 | P0.4 | bidirectional | Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P0MAT.4, INT0.4, INT1.4, UART0_TX, ADC0.4, CMP0P.4 and CMP0N.4. |
| 19 | P0.3 | bidirectional | Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P0MAT.3, EXTCLK, INT0.3, INT1.3, ADC0.3, CMP0P.3 and CMP0N.3. |
| 20 | P0.2 | bidirectional | Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P0MAT.2, INT0.2, INT1.2, ADC0.2, CMP0P.2 and CMP0N.2. |
| 21 | GND | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | SKYWORKS SILICON LABS |
| Package | QFN-20-EP(3x3) |
| Category | Embedded Processors & Controllers |
| Pins | 21 |
## CAD (KiCad official)
- Symbol: `EFM8BB21F16I-C-QFN20R`
- Footprint: `Package_DFN_QFN:UQFN-20-1EP_3x3mm_P0.4mm_EP1.85x1.85mm`
- 3D model: QFN-20-EP(3x3) (KiCad packages3D, STEP)
- 3D model files: `efm8bb21f16i-c-qfn20r-etched.step` / `efm8bb21f16i-c-qfn20r-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `efm8bb21f16i-c-qfn20r.step` / `efm8bb21f16i-c-qfn20r.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [SKYWORKS SILICON LABS datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589930628188696576) (59 pp, sha256 `68db19b3e729b537`, retrieved 2026-10-09, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-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/efm8bb21f16i-c-qfn20r-datasheet.pdf)