NXP Semiconductors KMA199E,115

Overview

KMA199E from NXP Semiconductors is a pre-calibrated, single-package magnetic angle sensor system integrating magneto-resistive (MR) bridges and mixed-signal IC circuitry. It delivers ratiometric analog output voltage proportional to measured mechanical angle, supports user-programmable zero angle (0–180°), angular range (5–180°), and clamping voltages, and operates across −40 °C to +160 °C ambient temperature - enabling direct integration into automotive throttle, steering, and industrial rotary position sensing.

For engineers reviewing the KMA199E datasheet, KMA199E pinout, KMA199E application, or KMA199E equivalent, key selection considerations include its 0.04° angle resolution, CORDIC-based digital angle computation, One-Wire Interface (OWI) programming capability, magnet-lost and power-lost diagnostics, and fail-safe EEPROM with CRC/EDC supervision.

Technical Context

The KMA199E digitizes orthogonal differential MR bridge signals via an on-chip ADC, computes angle using a hardware CORDIC algorithm, and converts result to ratiometric analog output via internal DAC and output buffer. Signal path includes offset cancellation, digital filtering, averaging, and programmable angular range mapping.

Diagnostics are embedded in real time: magnet-lost detection triggers output clamping outside 4–96% VDD; power-lost detection connects OUT/DIGINT to remaining supply/ground via internal switches; EEPROM integrity is verified at power-on with CRC and corrected via 22-bit protected 16-bit words.

Key Specifications

Pinout & Package

Package: SOT880 - plastic single-ended multi-chip package with 3 in-line leads and 6 interconnections.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar magnetic angle sensor applications.

Compared with AS5055A-DSOM and TLE5012B E1000, the KMA199E uniquely combines factory-calibrated analog output, One-Wire programmability, and integrated diagnostics in a 3-pin SOT880 package - reducing BOM count and eliminating need for external ADC or communication interface logic.

Availability

KMA199E is available at Aetrix Electronics and suitable for automotive throttle position sensing, industrial rotary valve control, electric power steering auxiliary monitoring, and robot joint position feedback requiring stable component supply across extended temperature and long product lifecycles.

Supply support for KMA199E 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 sensor signal conditioning and embedded processing.

The KMA199E belongs to NXP's programmable magnetic angle sensor product line, designed specifically for high-reliability, contactless angular position measurement in thermally demanding environments where analog simplicity and diagnostic robustness are critical.

FAQ

What is the operating temperature range of the KMA199E?

The KMA199E operates from −40 °C to +160 °C ambient temperature, making it suitable for under-hood automotive applications and high-temperature industrial environments. This range is validated per IEC 60134 limiting values and includes full functionality of analog output, diagnostics, and EEPROM programming within the specified 10 °C to 70 °C programming ambient window.

How does the KMA199E handle magnet absence or power interruption?

The KMA199E implements dedicated hardware-level detection: magnet-lost condition pulls the OUT/DIGINT pin to <4% VDD or >96% VDD depending on diagnostic mode setting; power-lost detection closes internal switches to connect OUT/DIGINT to the remaining functional supply or ground rail. Both mechanisms provide deterministic, protocol-free fault signaling without requiring host processor interpretation - a core feature of the KMA199E design.

Can the KMA199E be reprogrammed in-system, and what interface is used?

Yes, the KMA199E supports in-system programming via its One-Wire Interface (OWI) on the OUT/DIGINT pin. Users can adjust zero angle, angular range, clamping voltages, and 32-bit identifier without removing the device from the PCB. Programming requires overdriving the output buffer with ≥20 mA current during command entry and uses a defined timing protocol with start/stop conditions, handover/takeover bits, and charge-pump enable sequence - all documented in the KMA199E datasheet.

What is the angular accuracy specification of the KMA199E, and how is it achieved?

The KMA199E achieves ±1.55° linearity error (Δφlin) and ≤0.8° temperature drift error (Δφtemp) over −40 °C to +140 °C. Accuracy stems from factory calibration of MR bridge offsets and sensitivities, on-chip CORDIC computation eliminating software interpolation errors, and analog output stage trimmed to maintain ratiometric behavior. These parameters are guaranteed under specified operating conditions including 4.5–5.5 V supply and ≥35 kA/m external magnetic field strength.

Does the KMA199E require external passive components for basic operation?

Yes, the KMA199E requires two external capacitors per datasheet recommendations: a 100 nF blocking capacitor (Cblock) between VDD and GND, placed as close as possible to the package; and a 0.33–22 nF load capacitance (CL) between OUT/DIGINT and GND. These components stabilize internal regulators, suppress switching noise from the CORDIC/DAC chain, and ensure stable OWI communication timing - omission risks output instability or programming failure.