Bosch Sensortec BMI423 is an always-on, low-power 6-axis IMU for wearables, hearables, and robotics. Its 24-bit accelerometer and gyroscope support extended motion ranges, voice-activity detection, activity and step recognition, tap detection, wrist-wear wake-up, and wrist gestures.
Standard specifications
| Product model | BMI423 |
|---|---|
| Axes | 6-axis IMU: 3-axis accelerometer and 3-axis gyroscope |
| Accelerometer range | Selectable ±2, ±4, ±8, ±16, and ±32 g |
| Gyro range | Selectable ±125, ±250, ±500, ±1000, ±2000, and ±4000 °/s |
| Accuracy | Bosch specifies offset, temperature drift, sensitivity error, and noise density; it does not state absolute angular accuracy in degrees on the public page. |
| Sampling rate | Selectable output data rate: 12.5 Hz–6.4 kHz (Bosch BMI423 product page) |
| Output type | 24-bit digital accelerometer and gyroscope data |
| Interface | I3C, I²C, and SPI; two interrupt pins |
| Supply voltage | VDD: 1.71–3.63 V; VDDIO: 1.08–3.63 V |
| IP rating | Bosch does not state an IP protection rating on the public product page or flyer. |
| Dimensions | 2.5 × 3.0 × 0.83 mm³ LGA package (typ.) |
Technical extensions
Official BMI423 technical data: accelerometer offset ±35 mg and gyroscope offset ±0.6 °/s; temperature drift ±0.25 mg/K and ±0.007 °/s/K; sensitivity error 0.25% (accelerometer) and 0.4% (gyroscope); typical noise density 90 µg/√Hz (accelerometer, ≤8 g), 120 µg/√Hz (≥16 g), and 0.005 °/s/√Hz (gyroscope). Current consumption: 575 µA high-performance, 315 µA low-power, 14 µA suspend (A+G). Includes 4 KB FIFO and high-performance, normal, low-power, and suspend modes. The official page lists activity, motion, step, tap, voice activity, wrist wear, and wrist gesture interrupts. Public page and flyer do not provide an IP rating or absolute angular accuracy in degrees.
Sources: Bosch Sensortec BMI423 product page; BMI423 product flyer; BMI423 datasheet.
