# CMT2150A-ESR

**HopeRF Micro electronics** · RF Transceiver ICs · SOIC-14

CMT2150A-ESR from HopeRF Micro electronics, in a SOIC-14. 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 | LED | output | LED driver output, active low; it lights during transmission and flashes at 6 Hz (at least 5 times) when low battery is detected with LBD enabled. |
| 2 | VDD | power_in | Power supply input; recommended operating voltage 1.8 V to 3.6 V, absolute maximum -0.3 V to 3.6 V. |
| 3 | GND | power_in | Ground reference for the device. |
| 4 | RFO | output | Power amplifier RF output, specified into a matched 50 Ω load. |
| 5 | K7 | input | Push-button input 7 for the configurable button modes; not used in Toggle or PWM button modes. |
| 6 | K6 | input | Push-button input 6 for the configurable button modes; not used in PWM button mode. |
| 7 | K5 | input | Push-button input 5; in Matrix button mode it is one of the five matrix buttons (K1 on pin 11 through K5 on pin 7). |
| 8 | K4 | input | Push-button input 4 for the configurable button modes; in normal button mode it maps to data bit D3. |
| 9 | K3 | input | Push-button input 3 for the configurable button modes; not used in PWM button mode. |
| 10 | K2 | input | Push-button input 2 for the configurable button modes. |
| 11 | K1 | input | Push-button input 1 for the configurable button modes; in Matrix mode it is button B0. |
| 12 | DATA | bidirectional | Data pin for access to the embedded EEPROM; internally pulled up to VDD. |
| 13 | CLK | input | Clock pin for access to the embedded EEPROM; internally pulled up to VDD. |
| 14 | XTAL | input | 26 MHz single-ended crystal oscillator input, or external 26 MHz reference clock input through a coupling capacitor with amplitude 0.3 to 0.7 Vpp. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HopeRF Micro electronics |
| Package | SOIC-14 |
| Category | RF And Wireless |
| Pins | 14 |

## CAD (KiCad official)

- Symbol: `CMT2150A-ESR`
- Footprint: `Package_SO:SOIC-14_3.9x8.7mm_P1.27mm`
- 3D model: SOIC-14 (KiCad packages3D, STEP)
- 3D model files: `cmt2150a-esr-etched.step` / `cmt2150a-esr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cmt2150a-esr.step` / `cmt2150a-esr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [HopeRF Micro electronics datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586195209919479808) (31 pp, sha256 `b75622fd57894feb`, 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/cmt2150a-esr-datasheet.pdf)