# Ci24R1

**Nanjing Zhongke Microelectronics** · RF Transceiver ICs · SOIC-8

Ci24R1 from Nanjing Zhongke Microelectronics, in a SOIC-8. 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 | CSN | input | SPI chip selection digital input (Table 2.1 lists it as DI, pin function 'SPI chip selection'). |
| 2 | SCK | input | SPI clock digital input, with the maximum SPI rate stated as 10 MHz elsewhere in the datasheet. |
| 3 | DATA/IRQ | bidirectional | SPI data input/output and interrupt output (TX/RX hardware interrupt), with I/O voltage range 1.9-3.6V. |
| 4 | XC1 | input | Crystal oscillator input (analog input), used with a 16 MHz crystal with ±20 ppm tolerance. |
| 5 | XC2 | output | Crystal oscillator output (analog output), used with a 16 MHz crystal with ±20 ppm tolerance. |
| 6 | VDD | power_in | Power supply, +2.1 to +3.6 V DC. |
| 7 | ANT | passive | RF antenna port. |
| 8 | VSS | power_in | Ground, 0 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Nanjing Zhongke Microelectronics |
| Package | SOIC-8 |
| Category | RF And Wireless |
| Pins | 8 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply voltage (VDD) | VDD | -0.3 |  | 3.6 | V |  | 30 |
| Input voltage | VI | -0.3 |  | 3.6 | V |  | 30 |
| Power Dissipation |  |  |  | 100 | mW |  | 30 |
| Operation Temperature |  | -40 |  | 125 | ℃ |  | 30 |
| Storage Temperature |  | -40 |  | 125 | ℃ |  | 30 |
| ESD Performance HBM (Human Body Model) |  | -2000 |  | 2000 | V |  | 30 |
| Supply voltage | VDD | 2.1 |  | 3.6 | V |  | 30 |
| Supply current in Shutdown mode | ISHD | 2 |  | 4 | µA |  | 30 |
| RF operation frequency | FOP | 2400 |  | 2525 | MHz |  | 31 |
| Frequency deviation (2Mbps) | ΔFMOD(2Mbps) | -330 |  | 330 | KHz |  | 31 |
| Frequency deviation (1M/250Kbps) | ΔFMOD(1M/250Kbps) | -175 |  | 175 | KHz |  | 31 |
| Data rate | RGFSK | 250 |  | 2000 | Kbps |  | 31 |
| RF Output Power | PRF | -10 |  | 9 | dBm |  | 31 |
| Crystal frequency tolerance | ΔF | -20 |  | 20 | ppm |  | 31 |

## CAD (KiCad official)

- Symbol: `Ci24R1`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `ci24r1-etched.step` / `ci24r1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ci24r1.step` / `ci24r1.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Nanjing Zhongke Microelectronics datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588919853138370560) (40 pp, sha256 `89e71cb94574d531`, retrieved 2026-10-16, 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/ci24r1-datasheet.pdf)