Basic Product Information
Part Number: ICM-42688-P
| Field |
Value |
| Manufacturer |
TDK InvenSense |
| Device Type |
ICM-42688-P |
| Package |
LGA-14 (2.5 x 3 x 0.91 mm) |
| Compliance |
RoHS / Green Compliant |
| Grade |
Industrial (-40°C to +85°C) |
Core Electrical Parameters
| Parameter |
Value |
Unit |
| Sensor Type |
6-Axis (3-Axis Gyro + 3-Axis Accel) |
– |
| Gyroscope Noise Density |
2.8 |
mdps/√Hz |
| Gyro Offset Temp Stability |
±5 |
mdps/°C |
| Gyro Full-Scale Range |
±15.6 / 31.2 / 62.5 / 125 / 250 / 500 / 1000 / 2000 |
dps |
| Gyro Data Resolution |
16 / 19 |
bit |
| Accelerometer Noise Density |
65 (XY) / 70 (Z) |
µg/√Hz |
| Accel Full-Scale Range |
±2 / 4 / 8 / 16 |
g |
| Accel Data Resolution |
16 / 18 |
bit |
| FIFO Size |
2 |
KB |
| FIFO Data Format |
20-bit (19-bit gyro + 18-bit accel) |
– |
| Max ODR |
32 |
kHz |
| Host Interface |
I3C (12.5 MHz) / I2C (1 MHz) / SPI (24 MHz) |
– |
| VDD Supply |
1.71 ~ 3.6 |
V |
| VDDIO Supply |
1.71 ~ 3.6 |
V |
| 6-Axis LN Mode Current |
0.88 |
mA |
| Standby Current |
7.5 |
µA |
| Programmable Interrupts |
2 |
– |
| External Clock Input |
Yes (RTC) |
– |
| Temperature Sensor |
Built-in |
– |
| Shock Reliability |
20,000 |
g |
| Operating Temperature |
-40 ~ +85 |
°C |
| APEX Motion Engine |
Pedometer, Tilt, Tap, Wake-on-Motion, Raise-to-Wake/Sleep |
– |
| MSL |
1 (Unlimited) |
– |
| ECCN |
EAR99 |
– |
Core Features & Advantages
The ICM-42688-P delivers industry-leading 6-axis inertial sensing precision in an ultra-compact 2.5 x 3 mm footprint, purpose-built for AR/VR head tracking and robotic navigation where sub-degree orientation accuracy is non-negotiable.
- Primary Function: High-precision 6-axis MEMS MotionTracking device combining a 3-axis gyroscope (2.8 mdps/√Hz noise) and 3-axis accelerometer (70 µg/√Hz noise) with on-chip APEX motion processing, 2 KB FIFO, and I3C/I2C/SPI host interface for real-time orientation and motion detection.
- Advantages:
- Industry-Lowest Gyro Noise at 2.8 mdps/√Hz: The ICM-42688-P achieves the lowest gyroscope noise density in its class, enabling drift-free orientation tracking over extended periods. Combined with ±5 mdps/°C offset temperature stability and external RTC clock input, it reduces angular walk to levels previously achievable only with significantly larger and more expensive tactical-grade IMUs.
- 20-Bit FIFO Data Format with 32 kHz ODR: The proprietary 20-bit FIFO encapsulates 19-bit gyroscope and 18-bit accelerometer data — providing 4–8× higher resolution than standard 16-bit IMUs. At 32 kHz maximum ODR with real-time clock synchronization, it captures high-frequency vibration and transient shock events that lower-rate sensors alias or miss entirely.
- APEX On-Chip Motion Processing: The integrated APEX engine offloads pedometer, tilt detection, tap detection, wake-on-motion, raise-to-wake/sleep, and significant motion detection from the host MCU — enabling always-on context awareness at microamp-level system power consumption without any firmware development overhead.
Typical Application Scenarios
- Industry: AR/VR / Robotics / Wearables / IoT / Sports Tech
- Equipment: VR headsets, AR glasses, drone flight controllers, robotic arms, fitness wearables, smartwatches
- Use Cases:
- AR/VR Head-Mounted Display 6-DoF Tracking: The 2.8 mdps/√Hz gyro noise and 32 kHz ODR enable drift-free head orientation tracking with <1° angular error over 30-second intervals — meeting the stringent requirements of VR motion-to-photon latency budgets. External RTC clock input allows synchronization with display refresh cycles for time-warped rendering.
- Robot Navigation with Dead Reckoning: In GPS-denied environments (warehouses, tunnels), the ultra-low gyro drift and 19-bit resolution allow extended dead-reckoning navigation with minimal positional error accumulation. The FIFO burst-read capability minimizes SPI bus occupancy, leaving bandwidth for other sensor fusion inputs.
- Wearable Always-On Activity Recognition: APEX wake-on-motion and pedometer functions operate at standby-level current (7.5 µA), allowing the host MCU to remain in sleep until a significant motion event triggers an interrupt. This extends battery life in smartwatches and fitness bands from days to weeks.
Market Reference Price
| Market |
Price Range |
Currency |
| Huaqiangbei Spot |
$1.00 – $3.50 |
USD |
| Overseas B2B |
$2.98 – $4.65 |
USD |
Related Models Comparison
| Model |
Difference |
Application |
| ICM-42605 |
Previous-gen, 3.8 mdps/√Hz gyro noise, 8 kHz ODR, no RTC, 16-bit only |
Cost-sensitive motion sensing without AR/VR precision |
| ICM-42686-P |
Higher gyro range (±4000 dps), 5.3 mdps/√Hz, same 32 kHz ODR |
High-angular-rate applications (drone acrobatics, industrial rotation) |
| ICM-40607 |
Lower-cost, 7 mdps/√Hz gyro noise, 8 kHz ODR, no APEX |
Basic motion detection in IoT and consumer devices |
| BMI270 |
Bosch, 5.9 mdps/√Hz gyro noise, built-in gesture recognition, 16-bit |
Wearable activity tracking with competitive pricing |
