| Req. No. | Feature | Comment |
|---|
| 1 | Integrated Antenna | Wire or U.fl |
| 2 | Microcontroller / radio | STM32L072CZ / Murata CMWX1ZZABZ |
| 3 | Digital | IO With capacitors for filtering |
| 4 | Analogue | IO First order low pass filters (RC) |
| 5 | Battery | *See battery section |
| 6 | Max. sleep current |
|
| 7 | Voltage rail | 3.3V (nominal), 2.5 – 3.6V range |
| 8 | Battery measurement | CPU internal supply ADC |
| 9 | Sensor connectivity | I2C, UART, SPI. (Trade-off with IO) |
| 10 | Programming / debug interface | UART @ 115200 |
| 11 | Configuration interface | ST-LINK/V2 - JTAG/SWD |
| 12 | NFC | Integrated near Field Comms antenna |
| 13 | Temp operating range | -20 to 70 C |
| 14 | Low-cost accelerometer | On board |
| 15 | Low-cost push-button | On board |
| 16 | Low-cost Hall sensor | On board |
| 17 | Low cost temp and humidity | On board |
| 18 | Dimensions (w x l x h) | 24 x 37 x 1.5 mm |