NXP Semiconductors MM908E626AVDWB

Overview

MM908E626AVDWB from NXP (formerly Freescale) is an integrated automotive stepper motor driver combining a 68HC08EY16 MCU core and SMARTMOS analog control IC in a single 54-pin SOICW-EP package. It delivers four low-R_DS(ON) half-bridge outputs (425 mΩ HS / 400 mΩ LS), LIN physical layer interface, 16 KB flash/512 B RAM, and embedded voltage regulation (5.0 V @ 60 mA) - enabling compact climate control and headlight leveling systems.

For engineers reviewing the MM908E626AVDWB datasheet, MM908E626AVDWB pinout, MM908E626AVDWB application, or MM908E626AVDWB equivalent, key selection criteria include LIN bus compliance (20 kbaud), BEMF-based stall detection, programmable current limiting (210–880 mA), thermal shutdown (170 °C), and integrated autonomous watchdog with cyclic wake-up capability.

Technical Context

The MM908E626AVDWB integrates two die: an HC08 MCU die (68HC908EY16 core, 8 MHz bus, 10-bit ADC, ESCI, SPI, dual 16-bit timers) and an analog SMARTMOS die providing LIN transceiver, four half-bridge drivers, HVDD switchable 5 V output, internal 5 V regulator, and autonomous watchdog. Communication between dies occurs via dedicated SPI signals (SS, MOSI, MISO, SPSCK) routed internally - no external traces required.

Its LIN interface complies with ISO 17987-4 at 20 kbaud with programmable slew rate (SRS0:SRS1=00), recessive/dominant thresholds referenced to V_SUP, and wake-up sensitivity at V_SUP/2. The analog die supports BEMF monitoring (VBEMFH = 0 V, VBEMFL = −5 mV, hysteresis = 30 mV) and FGEN-driven current limitation with 0.1–20 kHz input frequency range.

Key Specifications

Pinout & Package

MM908E626AVDWB is housed in a 54-pin SOICW-EP (wide-body surface-mount) package with exposed thermal pad (EP) for enhanced heat dissipation. Package dimensions comply with JEDEC MS-013AC, lead finish is Pb-free (RoHS-compliant).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC33816AEKR2, MM908E626AVDWB offers lower system cost and smaller PCB area for LIN-only, single-stepper applications; compared with TC78H660FTG, it delivers full system integration (MCU + LIN + regulation + diagnostics) but with less peak current capability.

Availability

MM908E626AVDWB is available at Aetrix Electronics and suitable for automotive climate control, adaptive lighting, and seat positioning systems requiring stable component supply across extended temperature ranges (−40 °C to +115 °C case).

Supply support for MM908E626AVDWB 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 highly integrated solutions.

The MM908E626AVDWB belongs to NXP's legacy SMARTMOS automotive driver family, designed specifically for cost-optimized, space-constrained stepper motor control in body electronics with LIN connectivity and embedded diagnostics.

FAQ

What is the operating temperature range for the MM908E626AVDWB?

The MM908E626AVDWB is rated for operation from −40 °C to +115 °C case temperature (T_C). Its junction temperature limit is 135 °C, and thermal protection triggers reset at 170 °C and interrupt at 160 °C. This makes MM908E626AVDWB suitable for under-hood and cabin-mounted automotive applications where ambient extremes are expected.

How does the MM908E626AVDWB implement BEMF-based stall detection?

The MM908E626AVDWB provides a dedicated BEMF pin that outputs an analog signal proportional to back-electromagnetic force during motor rotation. This signal must be connected to the MCU's PTD0/TACH0/BEMF pin. The internal BEMF module compares the signal against thresholds (−30 mV to 0 V) with 30 mV hysteresis - enabling MM908E626AVDWB to detect zero-crossing loss and trigger stall alerts without external components.

Can the MM908E626AVDWB drive a 2-phase bipolar stepper motor?

Yes, the MM908E626AVDWB can drive a 2-phase bipolar stepper motor using HB1–HB4 as two independent H-bridges. Each pair (e.g., HB1/HB2 for Phase A, HB3/HB4 for Phase B) supports full-step, half-step, and microstepping when controlled by the embedded HC08 MCU's timer modules and BEMF feedback - all within a single MM908E626AVDWB device.

What LIN baud rate does the MM908E626AVDWB support?

The MM908E626AVDWB implements the LIN physical layer per ISO 17987-4 at a nominal 20 kbaud. Its slew rate is factory-configured (SRS0:SRS1 = 00), with propagation delays ≤6.0 µs and rise/fall times controlled to meet LIN timing tolerances. No external LIN transceiver is needed - the LIN pin connects directly to the vehicle bus.

Is external decoupling required for the MM908E626AVDWB voltage regulator outputs?

Yes, external decoupling is mandatory: a ≥10 µF low-ESR capacitor must be placed between VDD and VSS, and a high-quality ceramic capacitor (≥100 nF) between VREFH and VREFL. The HVDD output also requires a local 10 µF capacitor. These ensure stability of the 5.0 V regulators and accurate ADC reference performance - critical for reliable MM908E626AVDWB operation in noisy automotive environments.