NXP Semiconductors FXTH87EK116T1

Overview

FXTH87EK116T1 from NXP Semiconductors is a fully integrated tire pressure monitoring sensor (TPMS) with 8-bit S08 MCU core, on-die pressure sensor (90–1500 kPa), dual-axis (XZ) accelerometer (±90 g X, ±305 g Z), internal 315/434 MHz RF transmitter, and 16 kB FLASH/512 RAM - deployed in automotive wheel assemblies for real-time pressure, temperature, and motion telemetry.

For engineers reviewing the FXTH87EK116T1 datasheet, FXTH87EK116T1 pinout, FXTH87EK116T1 application, or FXTH87EK116T1 equivalent, key selection criteria include calibrated pressure range, LF receiver differential inputs (LFA/LFB), STOP4 low-power mode current (75–91 µA), RF modulation options (OOK/FSK), and HQFN24 package compatibility with TPMS PCB constraints.

Technical Context

The FXTH87EK116T1 integrates pressure, temperature, and dual-axis acceleration sensing with dedicated state machines that autonomously sequence measurement and RF transmission to minimize active MCU time. Its RF subsystem uses a PLL-based fractional-N divider with external crystal oscillator (X0/X1), supporting programmable data rates and Manchester/NRZ encoding into a 256-bit buffer.

Power management includes STOP1 (0.18–0.27 µA at 3.0 V) and STOP4 (75–91 µA) modes, wake-up via LFO-driven RTI (2–128 ms intervals), and hardware temperature restart up to +150 °C. The ADC10 provides six channels with ratiometric external voltage measurement capability on PTA0/PTA1.

Key Specifications

Pinout & Package

HQFN24 plastic thermally enhanced quad flat non-leaded package (SOT1575-1), 7 mm × 7 mm × 2.2 mm body, 1.0 mm pitch, pressure port side up.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar tire pressure monitor sensor applications.

Compared with FXTH87EK116T1, FXTH8713116T1 offers lower cost but sacrifices Z-axis motion awareness and LF command capability, while SP370-315 delivers higher RF robustness at the expense of integration density and autonomous motion response - making FXTH87EK116T1 optimal for compact, self-contained, vehicle-command-responsive TPMS designs.

Availability

FXTH87EK116T1 is available at Aetrix Electronics and suitable for automotive TPMS module manufacturing, heavy-duty trailer telemetry systems, and aftermarket wheel diagnostics equipment requiring stable component supply, long-lifecycle support, and AEC-Q200-aligned reliability.

Supply support for FXTH87EK116T1 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 headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.

The FXTH87 product line is designed specifically for ultra-low-power, high-reliability tire pressure monitoring systems - integrating sensing, processing, and RF transmission into a single die to meet stringent automotive qualification and 10+ year battery life requirements.

FAQ

What pressure range does the FXTH87EK116T1 support, and how is it calibrated?

The FXTH87EK116T1 supports a calibrated pressure range of 90 kPa to 1500 kPa, with a sensitivity of 2.80 kPa/LSB and offset of +87.20 kPa. Calibration is factory-trimmed and stored in on-chip parameter registers, enabling direct conversion of 10-bit pressure codes (PCODE) to absolute kPa values using the transfer function P = (2.80 × PCODE) + 87.20. This range covers passenger vehicles, light trucks, and many commercial applications.

Does the FXTH87EK116T1 include an integrated temperature sensor, and what is its accuracy?

Yes, the FXTH87EK116T1 includes an on-die temperature sensor with a transfer function of T(°C) = TCODE – 55, where TCODE is an 8-bit value. Accuracy is ±1 °C/LSB across –40 °C to +125 °C, verified by characterization. It is used for real-time pressure compensation and thermal event logging, and supports hardware-triggered restart at +95 °C.

How does the FXTH87EK116T1 achieve ultra-low power consumption in TPMS applications?

The FXTH87EK116T1 achieves ultra-low power via dedicated state machines that autonomously manage measurement and transmission sequences, minimizing MCU active time. STOP4 mode draws 75–91 µA (at 3.0 V, 25 °C) with LVD active, and wake-up is controlled by LFO-driven RTI interrupts (2–128 ms intervals). Combined with optimized ADC sampling and RF burst transmission, this enables >10-year battery life on a CR1632 cell.

What RF modulation schemes and data encoding options does the FXTH87EK116T1 support?

The FXTH87EK116T1 supports both OOK and FSK modulation on its 315 MHz or 434 MHz RF transmitter. Data encoding options include Manchester, Bi-Phase, and NRZ formats. The 256-bit RF data buffer supports variable-length interrupts, and the MCU has direct register-level access to the RF transmitter - enabling custom packet structures compliant with regional TPMS standards (e.g., SAE J2952, ETSI EN 302 208).

Is the FXTH87EK116T1 pin-compatible with other devices in the FXTH87 family?

Yes, the FXTH87EK116T1 features pin-for-pin electrical connections with other FXTH87-based customer applications, as confirmed in the official NXP datasheet Rev. 2.1. This includes identical GPIO mapping, LF receiver (LFA/LFB), crystal (X0/X1), and RF output pin assignments - allowing drop-in replacement in existing layouts when upgrading pressure range or accelerometer capability.