NXP Semiconductors NTM88K135ST1

Overview

NTM88K135ST1 from NXP Semiconductors is a fully integrated tire pressure monitoring sensor (TPMS) with dual-axis accelerometer architecture, 10-bit compensated pressure and accelerometer sensing, and internal 315/434 MHz RF transmitter. It integrates an S08 8-bit MCU, 16 kB flash, 512 bytes SRAM, and supports ASK/OOK LF reception at 125 kHz for vehicle TPMS applications.

For engineers reviewing the NTM88K135ST1 datasheet, NTM88K135ST1 pinout, NTM88K135ST1 application, or NTM88K135ST1 equivalent, this device delivers AEC-Q100 qualified operation across –40 °C to +125 °C, low-power Stop1 mode (0.18 µA), and configurable X/Z-axis accelerometer ranges (–80/+90 g and –360/+400 g) optimized for wheel-mounted pressure and motion sensing.

Technical Context

The NTM88K135ST1 implements a dedicated TPMS signal chain: pressure and dual-axis acceleration data are digitized via low-power 10-bit AFEs, processed by the S08 MCU, and transmitted via a PLL-based RF transmitter with fractional-N divider and OOK/FSK modulation. Its 125 kHz LF receiver uses differential LFA/LFB inputs with automated Manchester decoding for wake-up and configuration commands.

Power management includes three low-power modes (Stop1, Stop4, LF sniff), real-time interrupt driven by LFO (2–128 ms intervals), and independent clock domains: HFO (0.5–4 MHz bus), MFO (125 kHz), and LFO (504–1512 Hz). The device uses external 26 MHz crystal for RF carrier synthesis and supports client SPI access to peripherals, registers, and memory.

Key Specifications

Pinout & Package

NTM88K135ST1 is housed in a 4 mm × 4 mm × 1.98 mm HQFN24 thermal-enhanced quad flat package (SOT1931-1(D)) with wettable flank terminals and 0.5 mm pitch. The top-side pressure port enables direct tire cavity contact.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NTM88K135ST1, NTM88K125ST1 offers wider acceleration coverage on both axes for enhanced motion profiling, while NTM88K145ST1 reassigns high-sensitivity range to X-axis-enabling layout-driven axis optimization without changing firmware or RF stack.

Availability

NTM88K135ST1 is available at Aetrix Electronics and suitable for automotive TPMS design, vehicle safety system integration, and industrial pressure telemetry applications requiring stable component supply and long-life battery operation.

Supply support for NTM88K135ST1 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 automotive, industrial, and IoT applications, delivering secure, energy-efficient, and scalable silicon solutions.

The NTM88Kxx5S product line is designed specifically for automotive tire pressure monitoring, integrating sensing, processing, and RF/ LF communication into a single AEC-Q100 qualified die for under-wheel deployment.

FAQ

What is the pressure measurement range supported by the NTM88K135ST1?

The NTM88K135ST1 supports a pressure range of 90 kPa to 1518 kPa. This full-scale range accommodates all standard passenger and light-truck tire inflation pressures, with 10-bit compensated sensing ensuring accuracy across temperature and supply variations. The NTM88K135ST1 maintains this specification under AEC-Q100 conditions from –40 °C to +125 °C.

How does the NTM88K135ST1 manage power consumption in battery-operated TPMS applications?

The NTM88K135ST1 achieves ultra-low power operation with a Stop1 mode current of 0.18 µA typical, enabling >10-year battery life. It uses multiple low-power states-including Stop4 (75 µA), LF sniff (4.8 µA), and RF transmit (5.7 mA at 315 MHz)-all managed by its LFO-driven real-time interrupt system. The NTM88K135ST1's power architecture is validated for automotive duty cycles with periodic wake-up and burst transmission.

What RF and LF communication capabilities does the NTM88K135ST1 provide?

The NTM88K135ST1 integrates a programmable RF transmitter operating at 315 MHz or 434 MHz with OOK/FSK modulation and data rates up to 38.4 kbps, plus a 125 kHz differential LF receiver with ASK/OOK demodulation and automated Manchester decoding. The NTM88K135ST1 uses these interfaces for bidirectional communication: RF for pressure telemetry to the ECU, and LF for wake-up, configuration, and diagnostics.

What are the accelerometer ranges configured in the NTM88K135ST1?

The NTM88K135ST1 is configured with X-axis range –80 g to +90 g and Z-axis range –360 g to +400 g. These ranges are factory-set for optimal discrimination between rotational motion (X) and vertical impact events (Z), supporting both continuous monitoring and shock-triggered wake-up. The NTM88K135ST1's dual-axis architecture enables orientation-aware behavior without external calibration.

Is the NTM88K135ST1 qualified for automotive use, and what standards does it meet?

Yes, the NTM88K135ST1 is qualified per AEC-Q100 Rev. H for automotive applications. It meets stringent requirements for temperature cycling, mechanical shock, humidity, and electromagnetic compatibility in under-wheel environments. The NTM88K135ST1's qualification covers full operation from –40 °C to +125 °C and includes lifetime reliability validation aligned with automotive OEM specifications.