NXP Semiconductors MM908E625ACEK

Overview

MM908E625ACEK from NXP (formerly Freescale) is an automotive-grade integrated quad half-bridge driver with embedded HC08 MCU, LIN physical layer, and SMARTMOS analog control die. It delivers 4× low-R_DS(ON) half-bridge outputs (425 mΩ HS / 400 mΩ LS), 1× high-side switch (600 mΩ), 10-bit ADC, and operates across -40°C to +85°C in 54-pin SOICW-EP package - designed for mirror, door lock, and headlight leveling systems.

For engineers reviewing the MM908E625ACEK datasheet, MM908E625ACEK pinout, MM908E625ACEK application, or MM908E625ACEK equivalent, this page provides verified functional identity, validated pin roles, confirmed LIN 2.0–compliant transceiver behavior, real current-limiting thresholds (210–880 mA selectable), and exact thermal shutdown points (160°C HTI, 170°C HTR) - all traceable to Freescale Document Number MM908E625 Rev 10.

Technical Context

The MM908E625ACEK integrates two physically separate dies: an M68HC908EY16 MCU die (8 MHz bus, 16 KB flash, 512 B RAM) and a SMARTMOS analog die featuring autonomous watchdog (40 μs oscillator), cyclic wake-up, and LIN PHY with programmable slew rate (20 kBaud default). The dies communicate via internal SPI and share reset/interrupt signals (RST_A/IRQ_A).

Its four half-bridge drivers support configurable motor control modes - including step-motor commutation using BEMF feedback on PTD0 and FGEN-synchronized current limiting - while the HVDD switchable 5.0 V regulator powers external Hall sensors. All power MOSFETs include short-circuit, overtemperature, and overcurrent protection with diagnostic recopy via ADOUT.

Key Specifications

Pinout & Package

MM908E625ACEK uses a 54-pin SOICW-EP (exposed pad) package with dual-die construction: MCU die occupies top-left quadrant, analog die occupies bottom-right; exposed pad (EP) serves as primary thermal path to PCB ground plane.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar integrated motor driver with LIN applications.

Compared with MC33883 and TCANI1051, MM908E625ACEK uniquely combines MCU, LIN PHY, and four protected half-bridges in one package - eliminating interposer traces, reducing EMC risk, and cutting bill-of-materials by ≥7 components versus discrete solutions.

Availability

MM908E625ACEK is available at Aetrix Electronics and suitable for automotive mirror control, door lock actuation, and headlight leveling applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MM908E625ACEK 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 leader in automotive and industrial embedded processing, acquired Freescale in 2015 and maintains full technical continuity for legacy HC08-based analog-integrated products.

The MM908E625ACEK belongs to NXP's SMARTMOS automotive power integration family - engineered specifically for body electronics modules needing compact, LIN-connected motor control with built-in diagnostics and thermal resilience.

FAQ

What is the maximum continuous current rating for each half-bridge output in MM908E625ACEK?

Each half-bridge output (HB1–HB4) supports 2.0 A continuous current at TJ = 25°C with adequate PCB copper pour. Derating applies above 85°C ambient: at 125°C junction, max continuous current drops to ~1.3 A due to thermal limits. The device features low-side overcurrent shutdown at 2.8–7.5 A and high-side shutdown at 4.0–7.5 A - both with fast response (<1 μs) and automatic retry after fault clearance. This protects against short circuits while maintaining reliable operation in automotive environments.

Does MM908E625ACEK support LIN 2.1 or only LIN 2.0?

MM908E625ACEK implements the LIN 2.0 physical layer as specified in ISO 17987-2:2013, including recessive/dominant voltage thresholds, slew rate control (20 kBaud default), and bus fault tolerance. It does not support LIN 2.1 protocol enhancements such as sleep/wake synchronization or enhanced checksum - those require software-layer implementation in the embedded HC08 MCU, which is feasible but not hardware-accelerated. The LIN transceiver in MM908E625ACEK remains fully interoperable with LIN 2.1 master nodes in standard frame transmission mode.

How is the BEMF signal used in MM908E625ACEK for motor stall detection?

In MM908E625ACEK, the BEMF pin outputs a voltage proportional to back-electromotive force generated during motor rotation. For stall detection, this signal must be connected directly to PTD0/TACH0/BEMF on the MCU die. The dedicated BEMF counter module then measures zero-crossings or amplitude decay - triggering an interrupt if BEMF falls below VBEMFL (-5 mV) for >100 ms. This enables closed-loop stall detection without external comparators or ADC sampling, reducing latency and component count in stepper motor positioning systems.

Can MM908E625ACEK drive three-wire Hall-effect sensors directly?

Yes - MM908E625ACEK drives three-wire Hall-effect sensors directly via its HVDD pin (regulated 5.0 V output) and H1–H3 input terminals. HVDD supplies up to 60 mA at ±2.5% regulation, meeting typical Hall sensor supply requirements (4.5–5.5 V, <20 mA). The H1–H3 pins accept open-collector outputs and include internal pull-ups; no external resistors are needed. This eliminates two external components per sensor versus discrete solutions - a key advantage in space-constrained mirror and seat modules.

What is the function of the FGEN pin in MM908E625ACEK?

The FGEN pin in MM908E625ACEK sets the switching frequency for half-bridge and high-side current limiting - accepting a 0.1–20 kHz square wave input. It is not a standard PWM input; the device derives period only and auto-generates optimal duty cycle for inrush control and thermal management. FGEN synchronizes current-limiting pulses across all four half-bridges and the HS output, ensuring consistent motor torque and preventing phase imbalance in multi-load applications like dual-mirror systems.