NXP Semiconductors MM908E626AVPEKR2

Overview

MM908E626AVPEKR2 from NXP (formerly Freescale) is an integrated automotive stepper motor driver combining a 68HC08EY16 microcontroller and SMARTMOS analog control IC in a single 54-pin SOICW-EP package. It delivers 4 half-bridge outputs (R_DS(ON) ≤ 500 mΩ), embedded LIN physical layer, 16 KB flash/512 B RAM, and on-chip voltage regulation - enabling compact climate control and headlight leveling systems.

For engineers reviewing the MM908E626AVPEKR2 datasheet, MM908E626AVPEKR2 pinout, MM908E626AVPEKR2 application, or MM908E626AVPEKR2 equivalent, key selection criteria include LIN bus compliance, bipolar stepper phase control via HB1–HB4, BEMF-based stall detection, and thermal-safe operation up to 115 °C case temperature.

Technical Context

The MM908E626AVPEKR2 integrates two dies: an HC08 MCU die with 8 MHz bus frequency, 10-bit ADC, dual 16-bit timers, ESCI, SPI, and ICG; and an analog die featuring four protected half-bridges, autonomous watchdog, LIN transceiver, HVDD switchable 5 V output, and VSUP down-scaler for diagnostics. Communication between dies occurs via internal SPI with SS, MOSI, MISO, and SPSCK routed internally.

Its LIN interface supports 20 kbaud with programmable slew rate, recessive/dominant thresholds tied to VSUP, and wake-up capability. The BEMF module interfaces directly with PTD0/TACH0/BEMF to detect motor stall or coil faults, while FGEN input sets current-limit PWM period (0.1–20 kHz), not duty cycle.

Key Specifications

Pinout & Package

MM908E626AVPEKR2 uses a 54-pin SOICW-EP (wide-body surface-mount) package with exposed thermal pad (EP) for enhanced heat dissipation. Pin count and layout match Freescale's documented 54-SOICW footprint, supporting standard reflow profiles per JEDEC J-STD-020C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC33816AEK and DRV8837RGTR, MM908E626AVPEKR2 uniquely balances LIN-native communication, embedded 8-bit control, and four protected half-bridges in one package - making it the most direct solution for automotive stepper nodes where cost, size, and protocol alignment are critical.

Availability

MM908E626AVPEKR2 is available at Aetrix Electronics and suitable for automotive climate control, adaptive lighting, industrial valve actuation, and medical positioning systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MM908E626AVPEKR2 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 secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in automotive-grade mixed-signal integration.

The MM908E626AVPEKR2 belongs to NXP's SMARTMOS family - engineered specifically for cost-optimized, single-package motor control in automotive body electronics where LIN interoperability and functional safety are essential.

FAQ

What is the maximum continuous current per half-bridge output of the MM908E626AVPEKR2?

The MM908E626AVPEKR2 specifies a typical R_DS(ON) of 425 mΩ (HS) and 400 mΩ (LS) at 25 °C. With thermal derating and safe operating area constraints, each half-bridge supports ≥1.0 A continuous current under 115 °C case temperature conditions - verified by internal overcurrent shutdown thresholds of 3.0 A (HS) and 2.5 A (LS).

Does the MM908E626AVPEKR2 require an external LIN transceiver?

No, the MM908E626AVPEKR2 includes a fully compliant LIN physical layer integrated into its analog die. The LIN pin connects directly to the vehicle's single-wire LIN bus without external components - meeting ISO 17987-4 electrical requirements including dominant/recessive thresholds, slew rate, and bus leakage.

How does BEMF detection work on the MM908E626AVPEKR2, and which pin is used?

BEMF detection on the MM908E626AVPEKR2 uses the analog die's dedicated BEMF pin, which must be connected to MCU pin PTD0/TACH0/BEMF. The MCU's built-in BEMF counter module samples this signal to detect rotor position, enabling stall detection and coil failure diagnosis without external circuitry.

What is the function of the FGEN pin on the MM908E626AVPEKR2?

The FGEN pin on the MM908E626AVPEKR2 accepts a frequency input (0.1–20 kHz) that defines the period of the half-bridge current-limit PWM waveform. Unlike a standard PWM input, FGEN does not accept duty cycle control - the analog die autonomously generates the appropriate duty cycle based on sensed current and programmed limit levels.

Can the MM908E626AVPEKR2 drive unipolar stepper motors?

The MM908E626AVPEKR2 is optimized for bipolar stepper motor control using its four half-bridge outputs (HB1–HB4) in dual-H-bridge configuration. While unipolar operation is not supported natively, firmware can emulate unipolar drive by selectively enabling high-side switches - though this sacrifices torque and efficiency compared to native bipolar mode.