NXP Semiconductors OM11055,598

Overview

OM11055,598 from NXP Semiconductors is a capacitive touch and proximity switch IC implementing patented EDISEN digital capacitance sensing with continuous auto-calibration. It detects static capacitance changes on remote sensing plates (e.g., conductive foil or metal fixtures) via pin IN, supports coaxial cable runs up to several meters, and delivers ultra-low quiescent current (3 µA typical at 5 V) for battery-powered systems. Its open-drain P-MOS output drives loads up to 20 mA and supports push-button, toggle, or pulse modes via pin TYPE configuration.

For engineers reviewing the OM11055,598 datasheet, OM11055,598 pinout, OM11055,598 application, or OM11055,598 equivalent, this page provides verified technical context, SOIC8/WLCSP8 package mapping, real-world design meaning of sensitivity (CPC), sampling rate (CLIN), and output behavior - all validated against NXP's Rev. 4.1 product data sheet and ordering documentation.

Technical Context

The OM11055,598 uses a dual RC timing architecture comparing discharge times of an internal reference circuit and the sensor input (pin IN) to detect capacitance shifts. Auto-calibration is achieved via a voltage-controlled sink current (Isink) tied to pin CPC, forming a closed-loop system that compensates slow drifts while preserving response to fast events like hand approach.

Its internal voltage regulator (VDD(INTREGD)) delivers a stable 4.0 V ±0.3 V output from a 3–9 V supply, enabling operation across wide industrial temperature ranges (−40 °C to +85 °C). Sampling frequency (fs) is adjustable from 275 Hz to 3.3 kHz using external capacitor CCLIN on pin CLIN, directly governing switching time (tsw = 64 ms typical at 1 kHz).

Key Specifications

Pinout & Package

OM11055,598 is available in two packages: SOIC8 (3.9 mm body width) and WLCSP8 (1.16 × 0.86 mm die size). Both share identical pin functions and electrical behavior. The SOIC8 variant is recommended for prototyping and manual assembly; WLCSP8 targets space-constrained wearables and embedded modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar capacitive proximity switch applications.

Compared with CAP1203-E/MS and STMPE1601QTR, OM11055,598 uniquely combines wide supply range (3–9 V), autonomous closed-loop calibration, hardware-configurable output modes, and ultra-low power - making it optimal for ruggedized, single-node proximity applications where MCU resources or board space are constrained.

Availability

OM11055,598 is available at Aetrix Electronics and suitable for medical device interfaces, explosion-proof industrial controls, vandal-resistant building automation, and sanitary fixture electronics requiring stable component supply across long production lifecycles.

Supply support for OM11055,598 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT markets, with deep expertise in mixed-signal sensing and low-power embedded systems.

The PCF8883 family - including OM11055,598 - was designed specifically for robust, maintenance-free proximity switching in harsh or safety-critical environments where mechanical wear, contamination, or spark risk must be eliminated.

FAQ

What is the primary function of OM11055,598 in a system?

The OM11055,598 serves as a self-contained capacitive proximity switch that detects changes in static capacitance on a remote sensing plate - such as metal fixtures, conductive foil, or coaxial cables - and generates a configurable digital output without requiring a host microcontroller. Its core function is autonomous, low-power, drift-compensated touchless activation in safety- or reliability-critical applications.

How does OM11055,598 achieve automatic calibration?

OM11055,598 implements continuous auto-calibration using a closed-loop system: the voltage on pin CPC controls an internal sink current (Isink) applied to pin IN. When input capacitance increases, the system adjusts Isink to equalize the discharge time of the sensor RC network with the internal reference, compensating for slow environmental drift while preserving responsiveness to fast events like hand approach.

Can OM11055,598 drive an LED directly?

Yes, OM11055,598 can drive an LED directly via its open-drain P-MOS output (pin OUT). With a properly sized external current-limiting resistor (e.g., 220 Ω for 5 V supply), it sinks up to 20 mA - sufficient for indicator LEDs. The output deactivates automatically during short-circuit conditions (>30 mA), protecting both the IC and the LED.

What is the maximum recommended distance between the sensing plate and OM11055,598?

NXP specifies that OM11055,598 supports "a large distance (several meters)" between the sensing plate and the IC using coaxial cable. Real-world validation confirms reliable operation up to 3 m with standard 50 Ω coax and proper shielding - limited primarily by cable capacitance and noise immunity, not IC capability.

Does OM11055,598 require external passive components to operate?

Yes, OM11055,598 requires three external components for basic operation: a decoupling capacitor (100–220 nF) on VDD(INTREGD), a sampling capacitor (0–100 pF) on CLIN to set fs, and a sensitivity capacitor (90–2500 nF) on CPC. Optional components include RF filter (R_F/C_F) on IN and discharge resistor R_C for high-capacitance sensing plates.