NXP Semiconductors MM908E626AVPEK

Overview

MM908E626AVPEK 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), LIN physical layer compliance, embedded 16 KB flash/512 B RAM, and operates across -40 °C to +115 °C for climate control and headlight leveling systems.

For engineers reviewing the MM908E626AVPEK datasheet, MM908E626AVPEK pinout, MM908E626AVPEK application, or MM908E626AVPEK equivalent, key selection criteria include LIN bus interface timing, HB1–HB4 current-limiting configuration via FGEN, BEMF-based stall detection using PTD0/TACH0/BEMF, and thermal management of dual-die operation under 12 V automotive supply.

Technical Context

The MM908E626AVPEK integrates two physically separate dies: an HC08 MCU die (68HC908EY16 core, 8 MHz bus, 10-bit ADC, ESCI, SPI) and an analog SMARTMOS die (LIN transceiver, 4 half-bridges, voltage regulator, autonomous watchdog). Communication between dies occurs via dedicated SPI signals (SS, MOSI, MISO, SPSCK) and shared interrupt/reset lines (IRQ_A/RST_A).

Its LIN physical layer supports 20 kbaud with programmable slew rate, recessive/dominant thresholds referenced to V_SUP, and wake-up capability. The analog die provides diagnostic features including BEMF monitoring (VBEMFH/VBEMFL thresholds), current recopy (7.0 V/A ratio), and overcurrent shutdown (3.0–7.5 A per half-bridge).

Key Specifications

Pinout & Package

MM908E626AVPEK uses a 54-pin SOICW-EP (exposed pad) package with thermally enhanced construction. Pin assignments are split between MCU die (e.g., PTA0–PTA4, PTB1/AD1, PTC2/MCLK, PTD0/TACH0/BEMF, PTE1/RXD) and analog die (e.g., HB1–HB4, LIN, FGEN, BEMF, RST_A, IRQ_A, VSUP1–VSUP3, GND1–GND2, HVDD, VDD, VSS).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC33816AEKR2 and BD3901FV-ME2, MM908E626AVPEK uniquely balances embedded control (16 KB flash, ESCI, ADC), LIN interface, and 4-channel half-bridge drive in a compact SOICW-EP package-making it ideal for space-constrained, LIN-only automotive stepper applications where full CAN capability or external MCU coordination is unnecessary.

Availability

MM908E626AVPEK is available at Aetrix Electronics and suitable for automotive climate control, adaptive lighting, seat actuation, and power sunroof systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MM908E626AVPEK 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 develops high-reliability automotive ICs with focus on functional safety, power efficiency, and system integration for body electronics and powertrain applications.

The MM908E626AVPEK belongs to NXP's SMARTMOS family of integrated motor drivers, designed specifically for cost-effective, space-efficient LIN-based stepper motor control in automotive comfort systems.

FAQ

What is the maximum operating temperature for MM908E626AVPEK?

The MM908E626AVPEK has a specified operating case temperature range of -40 °C to +115 °C. Its junction temperature must not exceed +135 °C, with thermal coupling between the MCU and analog dies requiring careful PCB layout and heatsinking-especially when driving 1.0 A loads continuously through HB1–HB4. The exposed pad (EP) must be soldered to a thermal plane for reliable operation at maximum ratings.

How does MM908E626AVPEK implement BEMF-based stall detection?

The MM908E626AVPEK implements BEMF-based stall detection by routing the analog die's BEMF pin directly to MCU pin PTD0/TACH0/BEMF. The MCU's dedicated BEMF counter module samples this signal to identify zero-crossings and amplitude anomalies. When BEMF falls below VBEMFL (-5.0 mV) or exceeds VBEMFH (0 V) with insufficient hysteresis, the system triggers stall or coil-failure flags-enabling closed-loop position verification without external sensors.

Can MM908E626AVPEK drive a unipolar stepper motor?

No, MM908E626AVPEK is designed exclusively for bipolar stepper motors using its four half-bridge outputs (HB1–HB4) in dual-H-bridge configuration. It lacks the center-tap drive architecture required for unipolar steppers. Each half-bridge supports bidirectional current flow, enabling full-step, half-step, and microstepping modes-but only with 4-wire or 6-wire bipolar motors, not 5-wire unipolar variants.

What LIN baud rate does MM908E626AVPEK support by default?

The MM908E626AVPEK's LIN physical layer defaults to 20 kbaud with initial slew rate selection (SRS0:SRS1 = 00), as confirmed in Table 3 and Figure 4 of the datasheet. While the LIN specification allows 1–20 kbaud, the device's timing parameters-including t_TXD-LIN-LOW (≤6.0 µs) and slew rates (1.0–3.0 V/µs)-are characterized and guaranteed only at this default rate. Deviations require validation against LIN conformance test plans.

Is external decoupling required for MM908E626AVPEK's VDD and HVDD outputs?

Yes, external decoupling is mandatory: a minimum 10 µF low-ESR capacitor must be placed between VDD and VSS to stabilize the 5.0 V MCU supply, and a 1 µF ceramic capacitor is required between HVDD and VSS for the switchable 5.0 V output. These capacitors prevent voltage droop during high-current half-bridge switching events and ensure reliable LIN transceiver operation and ADC reference stability.