NXP Semiconductors KMA199,115

Overview

KMA199 from NXP Semiconductors is a pre-calibrated, single-package magnetic angle sensor system integrating anisotropic magnetoresistive (AMR) bridges and mixed-signal IC. It delivers ratiometric analog output voltage proportional to measured mechanical angle, supports programmable zero angle (0–180°), angular range (5–180°), and clamping voltages, and operates across −40 °C to +160 °C for automotive throttle and steering position sensing.

For engineers reviewing the KMA199 datasheet, KMA199 pinout, KMA199 application, or KMA199 equivalent, this page provides verified functional architecture, diagnostic behavior under magnet-loss/power-loss conditions, CORDIC-based angle computation, EEPROM-programmable 32-bit identifier, and real-world design meaning of clamping voltage deviation (±0.3%VDD), angular error (±1.35° over full temp range), and update frequency (3.125 kHz).

Technical Context

The KMA199 digitizes orthogonal differential MR bridge signals via a 12-bit ADC, computes angle using on-chip CORDIC algorithm with offset cancellation and digital averaging, then converts result to ratiometric analog output via internal DAC and buffered output stage. Signal conditioning includes built-in transient protection and fail-safe EEPROM with CRC/EDC supervision.

It implements One-Wire Interface (OWI) on pin OUT/DATA for programming zero angle, angular range, clamping voltages, and user registers; power-loss detection pulls output to VDD or GND upon supply/ground interruption; magnet-loss and low-VDD diagnostics drive output into defined diagnostic bands (0–4%VDD or 96–100%VDD).

Key Specifications

Pinout & Package

Package: SOT880 - plastic single-ended multi-chip package with 3 in-line leads and 6 interconnections, optimized for surface-mount assembly and thermal dissipation (R_th(j-a) = 120 K/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar magnetic angular measurement applications.

Compared with KMA199, AS5055A shifts angle computation off-chip and removes integrated diagnostics, while TLE5012B adds SENT output and tighter low-VDD tolerance but increases system complexity and cost - KMA199 remains optimal for cost-sensitive, analog-input automotive modules needing proven AEC-Q100 Grade 0 reliability and self-contained fail-safe operation.

Availability

KMA199 is available at Aetrix Electronics and suitable for automotive throttle position sensing, steering angle monitoring, and brake pedal position detection requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.

Supply support for KMA199 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 company specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with leadership in automotive MCUs, radar, and sensor signal conditioning.

The KMA199 belongs to NXP's high-temperature magnetic sensor product line, designed specifically for contactless angular position feedback in harsh automotive environments where reliability, diagnostic coverage, and extended temperature operation are mandatory.

FAQ

What is the maximum angular range programmable in the KMA199?

The KMA199 supports a programmable angular range from 5° to 180°, configured via EEPROM using the One-Wire Interface. This range defines the mechanical rotation span mapped linearly to the analog output voltage (e.g., 5–95%VDD). The KMA199 achieves this with ±0.3%VDD clamping voltage stability, ensuring repeatable end-point definition across temperature and lifetime.

How does the KMA199 handle power loss on VDD or GND lines?

The KMA199 integrates dedicated power-loss detection circuitry that closes internal switches to connect the OUT/DATA pin directly to the remaining functional supply line - pulling output to ≤4%VDD if GND is lost, or ≥96%VDD if VDD is lost. This behavior is confirmed in Table 4 and Figure 4 of the datasheet and applies only with load resistance >5 kΩ, enabling unambiguous fault signaling without external components.

Does the KMA199 require an external magnet, and what field strength is needed?

Yes, the KMA199 requires an external rotating magnet aligned parallel to the sensor plane. It operates reliably above 35 kA/m magnetic field strength - a threshold that ensures insensitivity to magnet aging or air-gap variation. Below this level, magnet-loss detection activates, driving output into diagnostic bands (0–4%VDD or 96–100%VDD), as specified in Section 7.2 and Table 7.

Can the KMA199 output be used directly by a standard 12-bit microcontroller ADC?

Yes - the KMA199 delivers a ratiometric analog output spanning 5–95%VDD, fully compatible with standard 12-bit SAR or delta-sigma ADCs referenced to the same VDD. With typical supply noise rejection and 0.4–2.5 mV RMS output noise (Table 11), it achieves effective resolution better than 10 bits without oversampling. The KMA199's ±1.35° angular error remains bounded even at full temperature range.

What diagnostic functions are implemented in the KMA199 and how are they signaled?

The KMA199 implements four diagnostics: EEPROM CRC/EDC, magnet-loss, power-loss, and low-supply detection. All are signaled via the same OUT/DATA pin by forcing output into defined diagnostic voltage bands - specifically 0–4%VDD (low-band) or 96–100%VDD (high-band) - as detailed in Sections 7 and Table 5. No additional pins or protocols are required, simplifying ECU interface design.