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Ultra-Low-Power Integrated MEMS Ultrasonic Time‑of‑Flight Range Sensor with Millimeter Accuracy

Chirp’s MEMS based ultrasonic technology leverages a Time‑of‑Flight (ToF) range sensor with a power-efficient digital signal processor (DSP) ASIC in a 3.5 × 3.5 mm package. The sensor handles a variety of ultrasonic signal-processing functions and algorithms, enabling customers flexible industrial design options for a broad range of use-case scenarios, including range-finding, presence and proximity sensing, object-detection and avoidance, and position-tracking.

Complementing Chirp’s long-range CH201 ultrasonic ToF sensor product, the CH101 provides accurate range measurements to targets at distances up to 1.2m. Using ultrasonic measurements, the sensor works in any lighting conditions, including full sunlight to complete darkness, and provides millimeter-accurate range measurements independent of the target’s color and optical transparency. The sensor’s wide Field‑of‑View (FoV) can be customized and enables simultaneous range measurements to multiple objects in the FoV.



  • Single ended, non‐inverting analog output
  • Enhanced RF immunity

Featured Markets

  • Augmented and Virtual Reality
  • Robotics
  • Obstacle avoidance
  • Mobile and Computing Devices
  • Proximity/Presence sensing
  • Ultra-low power remote presence-sensing nodes
  • Home/Building automation

Product Details

ProductOperationPackage Size
Current Consumption
(1sample/s, 1m Range)

Pulse-Echo3.5 × 3.5 × 1.26,
8-pin LGA
Up to 1.215 uAI²CField-of-View (FoV):
Configurable Up to 180°

Pitch-Catch3.5 × 3.5 × 1.26,
8-pin LGA
Up to 1.215 uAI²CField-of-View (FoV):
Configurable Up to 180°

Comprehensive Development Platform for MOD_CH101

Features & Benefits

  • Ultra-Low Power
  • Works in Any Lighting Condition
  • Detects objects of any color and optical transparency
  • Customizable field of view (FoV) up to 180°
  • Integrated 3.5 × 3.5 × 1.26 mm Package
  • Low-power SoC firmware for ultrasonic processing a wide-range of usage cases

CH101 Applications

Social Distancing



AR/VR Gaming

Ultra-low power and High Accuracy Ultrasonic ToF sensors accurately measure proximity breaches and provide warnings before crossing social distancing guidelines

Ultrasonic ToF sensors enable Cliff detection, material composition identification, and obstacle avoidance

Always-on ultra-low power Ultrasonic ToF sensors can detect the presence of a glass as well as the level of the liquid inside

Compact, low power ultrasonic ToF sensors enable user experiences in gaming under any lighting conditions

Additional Social Distancing Resources:

Additional Robotics Resources:

Liquid Level Detection:


Evaluation Tools

CH101 Development Kit

CH101 Omnidirectional Module

CH101 Module with 45° FoV & Particle Ingress Filter




Comprehensive development platform for CH101, with the ability to connect up to four additional CH101 modules.

Ultrasonic ToF omnidirectional sensor module for rapid prototyping and integration into product enclosures.

Ultrasonic ToF 45° FoV sensor module with PIF for rapid prototyping and mass production.

Acoustic Housing Options


Symmetrical 180° FoV horn to use with the CH101.

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