CP Series
Every positive airway pressure device needs two measurements: mask pressure to verify therapy delivery and differential pressure to detect flow and mask leak. The CP Series integrates both in a single device, combining differential and gauge measurement with 64 configurable combinations and a 2‑millisecond response for CPAP, BiPAP, and APAP applications.
64
cofigurations
3 & 4
port options
dual sensor
solution
Integrated
snore detection
CP Series Overview
Most positive airway pressure designs require two pressure sensors: one for the differential measurement needed for breath detection and flow, and another for the gauge measurement needed for mask pressure monitoring. The CP Series replaces both with a single NimbleSense device, combining fully independent differential and gauge channels in one package and offering 64 configurable measurement combinations built specifically for CPAP, BiPAP, and APAP.
Integrated dual sensing
The CP Series combines a differential pressure sensor and a gauge pressure sensor in a single package. Differential measurement handles breath detection and inspiratory flow; gauge measurement handles mask pressure monitoring and therapy delivery verification. One device replaces two, reducing BOM cost, PCB footprint, and integration complexity across PAP platforms. Available in either a shared 3‑port configuration or a dedicated 4‑port configuration to match different circuit designs.
64 configurations
Four programmable differential pressure ranges, four programmable gauge pressure ranges, and four digital bandwidth filter options are independently selectable, yielding 64 possible configurations in a single device. Engineers can tune both sensors and filtering to the specific pressure and flow characteristics of each therapy mode, allowing a single PAP platform to support patients from infants to adults without stocking separate sensor variants for CPAP, BiPAP, and APAP pressure windows.
Snore detection (CP203/CP303)
CP203 and CP303 models include integrated snore detection. Snore events produce characteristic high‑frequency pressure signatures that the sensor detects and flags directly, providing PAP platforms with a snore signal they can use as a therapy‑adjustment trigger without requiring separate detection hardware or complex host‑processor algorithms. This built‑in capability helps manufacturers refine auto‑titration behavior while keeping system design simpler and more compact.
Integrated closed-loop control (CP202/CP302)
Stable PAP therapy depends on a control loop that continuously adjusts motor output to maintain target mask pressure through each breath cycle, patient movement, and mask-fit variations. CP202 and CP302 provide an integrated closed-loop control that drives the motor, eliminating the microcontroller round-trip required by software-based pressure regulation. The result is tighter regulation around the therapy target, faster response to patient breathing events, and more stable mask pressure delivery.
Fast 2-millisecond response
A 2‑millisecond update rate delivers breath‑by‑breath fidelity across both measurement channels. Inspiratory and expiratory transitions, mask leak events, and apnea detection all depend on distinguishing true pressure changes from the noise generated by the PAP motor and blower. The 2‑ms rate ensures the sensor keeps pace with the fastest physiologically relevant events in PAP therapy.
Advanced digital filtering (optional)
PAP motors and blowers generate broadband pressure noise that couples directly into the measurement path. The optional advanced digital filtering stage applies multi‑order filtering to both the differential and gauge channels, removing motor‑induced noise and delivering clean pressure outputs that accurately reflect patient and mask conditions without slowing the 2 ms update rate.
CP Series Product Offerings
Common Device Features: 3.3V supply
Long-Term Stability is measured after first 12 months
Short-Term Error Band (STEB) is measured over 24 hours, after auto-zero
Common Specifications
- Combines separate differential and gauge sensors in one device
- 64 possible configurations per device
- Optional advanced digital filtering
- Standard I2C and SPI interfaces
- Available in shared and dedicated port configurations for maximum flexiblity
- Temperature-compensated from 0°C to 50°C
- Supply voltage compensation
- Fully integrated compensation math
Features Matrix
| Product | Pressure Ports | Possible Configurations | Closed Loop Control | Overpressure Indicator | Snore Detection | Advanced Digital Filtering |
|---|---|---|---|---|---|---|
 | 3 | 64 |  |
|||
 | 3 | 64 |  | | |
|
 | 3 | 64 | | |
||
 | 4 | 64 | |
|||
 | 4 | 64 | | | |
|
 | 4 | 64 | | |
The CP202 and CP302 are available through a collaborative development program with our engineering team. Because these models require significant custom development, we reserve capacity for high-volume production programs where our engineering investment is well matched to program scale. If that describes your program, we want to hear from you.
Evaluation and Accessories
| Evaluation hardware and accessories | |||
|---|---|---|---|
 | Evaluation board EB02 supports CP201, CP203, CP301, and CP303 sensors. CP202 and CP302 require a custom development platform. | ||
 | Right angle adapters for reducing total Z-height. KP-ROR includes o-rings for an airtight seal. CP200 Series only. | ||
CP Series Typical Implementation
Resources
| Data Sheet and Other Series Documentation | Version | Date | Download |
|---|---|---|---|
| CP Series Data Sheet for CP201 and CP301 (DS-0005) | F | August 2024 |  |
| CP Series Data Sheet for CP203 and CP303 (DS-0012) | A | May 2025 | |
| Data Sheet Definitions (AN-0011) | A | February 2024 | |
| Pressure Sensor Handling & Assembly Instructions (AN-0010) | C | February 2026 | |
| Tubing Recommendations for Pressure Ports (AN-0014) | A | March 2026 | |
| CP Series Product Brief (PB-0005) | D | May 2025 | |
| Unique Features for Medical Applications (MB-0002) | C | May 2025 | |
| Evaluation Software | Version | Date | Download |
|---|---|---|---|
| EB02 Evaluation Software (PRT-0279) | G | December 2025 |  |
| EB01 Evaluation Software (PRT-0143) | E | February 2024 | |
| Drawings and CAD Files | Version | Date | Download |
|---|---|---|---|
| SM04 Package for CP201 and CP202 Sensors (IGS and STEP files) | A | March 2023 | |
| SM06 Package for CP301 and CP302 Sensors (IGS and STEP files) | A | March 2023 | |
| KP-ROR Package for Right Angle Adapters (STEP file) | A | February 2024 | |
Download models in over 50 formats
| Catalogs and Compliance Documentation | Version | Date | Download |
|---|---|---|---|
| Product Ordering Guide (PL-0001) | X | May 2025 | |
| NimbleSense Capabilities Brochure (MB-0001) | B | April 2023 | |
| Product Catalog (MB-0004) | F | May 2025 | |
| Certificate of RoHS Compliance (CS-0001) | A | May 2019 | |
| Statement of REACH-253 Compliance (CS-0002) | E | May 2026 | |
| Statement on Use of Conflict Minerals (CS-0003) | A | May 2019 | |
| Certificate of California Proposition 65 Compliance (CS-0006) | A | May 2019 | |
Videos
CPAP Application Video
CP Series Benefits Summary
CP Series Frequently Asked Questions
Why does a CPAP, BiPAP, or APAP device need both differential and gauge pressure measurements?
A PAP device must solve two distinct measurement problems simultaneously. Differential pressure, measured across the flow path, captures the dynamic signal of patient breathing: inspiration, expiration, flow rate, and the characteristic pattern of airway obstruction. Gauge pressure, referenced to ambient, captures the static pressure at the mask needed to verify that the therapy target is being delivered and maintained. Without differential measurement, the device cannot detect breath events or compute flow. Without gauge measurement, it cannot confirm that the pressure required to hold the airway open is present at the mask. Traditional designs use separate sensors for both; the CP Series integrates them into a single dual‑channel device.
How are the 64 measurement configurations derived and selected?
The CP Series contains two fully independent sensor channels: a differential pressure channel with four programmable pressure ranges and a gauge pressure channel with four programmable pressure ranges. Because each channel is configured independently, the base combination count is 4 differential ranges multiplied by 4 gauge ranges, for a total of 16 range pairs. Each of these pairs can be combined with one of four digital bandwidth filter options, bringing the total to 64 possible configurations per device. Active ranges, filters, and other settings are selected via software commands, allowing the same device to be tuned to the specific pressure windows and dynamic behavior of different PAP therapy modes without a hardware change.
What is the difference between the 3-port SM04 and 4-port SM06 housings?
The SM04 housing provides three pressure ports, with one port shared between the differential and gauge channels. It suits CPAP circuit topologies where both measurements reference a common point in the pneumatic path. The SM06 housing provides four ports, with fully dedicated ports for each channel, for designs where the differential and gauge channels must sample from physically separate locations in the airway, such as when the flow measurement tap and the mask pressure tap are at different points in the circuit. In both housings, a port on the bottom of the package measures ambient pressure for the gauge channel. Housing selection is typically determined by the pneumatic architecture of the PAP platform rather than by any functional difference in the sensors themselves.
How does snore detection work in the CP203 and CP303, and what does it output?
Snoring produces characteristic high-frequency pressure oscillations in the airway that are distinct from normal breathing patterns. CP203 and CP303 models include integrated signal processing that detects these oscillations directly from the differential pressure channel and flags them without requiring the host processor to analyze raw pressure waveforms. On PAP platforms, this snore signal serves as a therapy trigger: the device can increase delivered pressure in response to detected snoring before a full apnea event develops, improving responsiveness and comfort. The snore detection flag is available via the digital interface alongside the normal pressure data from both sensor channels.
How do I choose between the CP201, CP202, and CP203 models?
The three CP Series models share the same dual-sensor architecture, 64-configuration-range system, and 2‑millisecond update rate, differing only in their integrated capabilities. CP201 is the baseline device for designs that handle pressure control and breath detection entirely in system software. CP202 adds an integrated closed-loop control output for platforms that require hardware-level pressure regulation. Because it requires collaborative development with our engineering team, this model is offered through partnership engagements for high-volume production programs. CP203 adds integrated snore detection, with breath-pattern classification part of the therapy algorithm. Each model is available in SM04 and SM06 housing variants to match different pneumatic circuit topologies, as described above.
How does the CP Series’ long-term stability specification apply to therapy accuracy over the device’s lifetime?
The CP Series differential channel has a 2 Pa long‑term stability specification, and the gauge channel has 12 Pa, both measured after the first 12 months of operation. At a typical CPAP therapy pressure of 10 cmH₂O (approximately 980 Pa), a 2 Pa differential drift is roughly 0.2% of the therapy target, while a 12 Pa gauge drift is about 1.2%. This level of stability allows the sensor to maintain measurement integrity through a full annual service interval without recalibration, supporting the consistent therapy delivery that home‑use PAP devices are expected to provide over their service life.
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