# CC2531F256RHAR

**Texas Instruments** · RF Transceiver ICs · VQFN-40-EP(6x6)

CC2531F256RHAR from Texas Instruments, in a VQFN-40-EP(6x6). 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 | DGND_USB | power_in | Ground connection for USB interface pads. |
| 2 | USB_P | bidirectional | USB differential data plus (D+) signal connection. |
| 3 | USB_N | bidirectional | USB differential data minus (D-) signal connection. |
| 4 | DVDD_USB | power_in | 3.3V power supply connection for USB pads. |
| 5 | P1_5 | bidirectional | Digital I/O port 1.5 pin. |
| 6 | P1_4 | bidirectional | Digital I/O port 1.4 pin. |
| 7 | P1_3 | bidirectional | Digital I/O port 1.3 pin. |
| 8 | P1_2 | bidirectional | Digital I/O port 1.2 pin. |
| 9 | P1_1 | bidirectional | Digital I/O port 1.1 pin with 20-mA drive capability. |
| 10 | DVDD2 | power_in | 2-V to 3.6-V digital power-supply connection. |
| 11 | P1_0 | bidirectional | Digital I/O port 1.0 pin with 20-mA drive capability. |
| 12 | P0_7 | bidirectional | Digital I/O port 0.7 pin. |
| 13 | P0_6 | bidirectional | Digital I/O port 0.6 pin. |
| 14 | P0_5 | bidirectional | Digital I/O port 0.5 pin. |
| 15 | P0_4 | bidirectional | Digital I/O port 0.4 pin. |
| 16 | P0_3 | bidirectional | Digital I/O port 0.3 pin. |
| 17 | P0_2 | bidirectional | Digital I/O port 0.2 pin. |
| 18 | P0_1 | bidirectional | Digital I/O port 0.1 pin. |
| 19 | P0_0 | bidirectional | Digital I/O port 0.0 pin. |
| 20 | RESET_N | input | Active-low reset signal input. |
| 21 | AVDD5 | power_in | 2-V to 3.6-V analog power-supply connection. |
| 22 | XOSC_Q1 | bidirectional | 32-MHz crystal oscillator pin 1 or external clock input. |
| 23 | XOSC_Q2 | bidirectional | 32-MHz crystal oscillator pin 2. |
| 24 | AVDD3 | power_in | 2-V to 3.6-V analog power-supply connection. |
| 25 | RF_P | bidirectional | Positive RF signal for LNA input during receive and PA output during transmit. |
| 26 | RF_N | bidirectional | Negative RF signal for LNA input during receive and PA output during transmit. |
| 27 | AVDD2 | power_in | 2-V to 3.6-V analog power-supply connection. |
| 28 | AVDD1 | power_in | 2-V to 3.6-V analog power-supply connection. |
| 29 | AVDD4 | power_in | 2-V to 3.6-V analog power-supply connection. |
| 30 | RBIAS | bidirectional | External precision bias resistor for reference current connection. |
| 31 | AVDD6 | power_in | 2-V to 3.6-V analog power-supply connection. |
| 32 | P2_4/XOSC32K_Q1 | bidirectional | Digital I/O port 2.4 or 32.768-kHz crystal oscillator pin 1. |
| 33 | P2_3/XOSC32K_Q2 | bidirectional | Digital I/O port 2.3 or 32.768-kHz crystal oscillator pin 2. |
| 34 | P2_2 | bidirectional | Digital I/O port 2.2 pin. |
| 35 | P2_1 | bidirectional | Digital I/O port 2.1 pin. |
| 36 | P2_0 | bidirectional | Digital I/O port 2.0 pin. |
| 37 | P1_7 | bidirectional | Digital I/O port 1.7 pin. |
| 38 | P1_6 | bidirectional | Digital I/O port 1.6 pin. |
| 39 | DVDD1 | power_in | 2-V to 3.6-V digital power-supply connection. |
| 40 | DCOUPL | power_in | 1.8-V digital power-supply decoupling connection; do not use for external circuit power. |
| 41 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | VQFN-40-EP(6x6) |
| Category | RF & Radio |
| Pins | 41 |

## CAD (KiCad official)

- Symbol: `CC2531F256RHAR`
- Footprint: `Package_DFN_QFN:QFN-40-1EP_6x6mm_P0.5mm_EP4.6x4.6mm`
- 3D model: VQFN-40-EP(6x6) (KiCad packages3D, STEP)
- 3D model files: `cc2531f256rhar-etched.step` / `cc2531f256rhar-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cc2531f256rhar.step` / `cc2531f256rhar.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/cc2531) (43 pp, sha256 `c45dac1eac9cf199`, retrieved 2026-10-07, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-4-5-20251001` (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/cc2531f256rhar-datasheet.pdf)