MCZ33977EG - SPI Stepper Motor Gauge Driver | NXP | 24-SOIC
MPN: MCZ33977EG ✓ نشطMCZ33977EG نظرة عامة
A stepper motor gauge driver (also called an instrument cluster driver or single gauge driver) sits inside the power management hierarchy as a specialized motor driver IC that translates SPI micro-controller commands into the precise bipolar current waveforms required by air-core and permanent-magnet stepper movements. The MCZ33977EG belongs to NXP's 33977 family of dual H-bridge gauge drivers and is engineered to provide the back-EMF sensing, microstepping, and fault diagnostics that automotive dashboards demand.
Key electrical capabilities include dual H-bridge outputs capable of sourcing and sinking the 40 mA to 200 mA peak phase currents typical of 0W to 5W gauge coils, with integrated freewheeling diodes for inductive kick protection. The SPI port supports daisy-chaining multiple 33977 devices on a single microcontroller bus, reducing ECU pin count. Integrated fault detection covers open load, short to battery/ground, and thermal shutdown, with a fault flag relayed back over SPI to the host MCU. The wide 4.5V-5.5V supply range tolerates cranking transients common in 12V automotive systems when used with a pre-regulator.
Architecturally, the device pairs CMOS logic for SPI decoding with bipolar DMOS output stages, balancing digital noise immunity with the high peak current capability gauges need. The internal charge pump generates the gate drive for the high-side FETs, while cycle-by-cycle current limiting protects the coils during pointer overshoot.
Typical applications include automotive analog instrument clusters, industrial process indicators, HVAC damper stepper actuators, and any small-signal stepping motor drive where SPI control simplifies wiring versus parallel-logic drivers. The automotive-grade temperature rating and integrated protection make it well-suited for under-dash ECU placements.
When laying out this part, place the two motor bypass capacitors on each H-bridge supply pin as close to the SOIC body as possible and use a small R-C snubber across each motor terminal if the gauge harness exceeds 100 mm, since long cable lengths cause ringing that can confuse the internal back-EMF comparator.
This page synthesizes distributor pricing, drop-in same-package alternatives from NXP's 33996/33926 family, and practical design notes not found in the original Freescale/NXP datasheet, providing engineers with a single reference they can cite when selecting a stepper gauge driver.
بدائل مباشرة لـ MCZ33977EG — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع MCZ33977EG (نفس عامل الشكل والبصمة) — يختلف في Package, RoHS Status.
MCZ33977EGR2
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
MCZ33937EFR2
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
MCZ33977EF
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
MCZ33977EGR2G
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منها📋 بديل مرجعي (غير موجود في الكتالوج)
MCZ33977EG الحدود القصوى والخصائص الكهربائية
| Product Type | Stepper motor gauge driver IC |
| Control Interface | SPI (Serial Peripheral Interface) |
| البنية الطوبولوجية | Dual H-bridge with integrated control logic |
| جهد التغذية | 4.5 V to 5.5 V |
| Junction Operating Temperature | -40C to +150C |
| العلبة | 24-pin SOIC (wide body) |
| نوع التركيب | Surface Mount |
| عدد الدبابيس | 24 |
| مستوى حساسية الرطوبة (MSL) | 3 |
| Peak Reflow Temperature | 260C |
| Maximum Time at Peak Reflow Temperature | 40 s |
| Terminal Finish | Matte Tin (Sn) |
| JESD-609 Code | e3 |
| Temperature Grade | Automotive |
| حالة RoHS | Compliant (per JESD-609 e3 matte tin finish) |
تكوين أطراف MCZ33977EG
| دبوس 1 | OUT1A — H-bridge 1 output A (motor coil terminal) |
| دبوس 2 | OUT1B — H-bridge 1 output B (motor coil terminal) |
| دبوس 3 | PGND1 — Power ground return for H-bridge 1 |
| دبوس 4 | VPWR1 — Power supply input for H-bridge 1 (motor supply) |
| دبوس 5 | SCLK — SPI serial clock input |
| دبوس 6 | MOSI — SPI master-out slave-in (data input to device) |
| دبوس 7 | MISO — SPI master-in slave-out (data output from device) |
| دبوس 8 | CS — SPI chip select (active low) |
| دبوس 9 | RESET — Device reset input (active low) |
| دبوس 10 | FAULT — Open-drain fault flag output |
| دبوس 11 | VSUP — Logic supply input (5V) |
| دبوس 12 | GND — Logic ground |
| دبوس 13 | VPWR2 — Power supply input for H-bridge 2 (motor supply) |
| دبوس 14 | PGND2 — Power ground return for H-bridge 2 |
| دبوس 15 | OUT2A — H-bridge 2 output A (motor coil terminal) |
| دبوس 16 | OUT2B — H-bridge 2 output B (motor coil terminal) |
| دبوس 17 | NC — Not connected (per datasheet) |
| دبوس 18 | NC — Not connected (per datasheet) |
| دبوس 19 | NC — Not connected (per datasheet) |
| دبوس 20 | NC — Not connected (per datasheet) |
| دبوس 21 | NC — Not connected (per datasheet) |
| دبوس 22 | NC — Not connected (per datasheet) |
| دبوس 23 | NC — Not connected (per datasheet) |
| دبوس 24 | NC — Not connected (per datasheet) |
التطبيقات النموذجية
MCZ33977EG مناسب لـ 6 التطبيقs: Automotive Speedometer Gauge, Engine Tachometer Drive, Fuel Level Gauge, Engine Coolant Temperature Gauge, Industrial Process Indicator, HVAC Stepper Damper Actuator.
Automotive Speedometer Gauge
The MCZ33977EG drives the bipolar stepper coils of a 0-250 km/h automotive speedometer, sourcing and sinking phase currents in quadrature to position a magnetic pointer smoothly across the dial. Its 4.5V-5.5V supply aligns with the regulated 5V rail that follows the MCZ33996EKR2 switching pre-regulator, and the -40C to +150C automotive temperature rating survives under-dash thermal stress. SPI-controlled microstepping plus built-in open-load and short-to-battery diagnostics let the cluster MCU verify pointer health at every key-on without adding external sense resistors.
موصى به
Engine Tachometer Drive
In an analog tachometer cluster the MCZ33977EG's dual H-bridge produces the alternating bipolar currents that swing the needle between idle and redline in response to RPM SPI messages from the host MCU. The internal charge-pumped gate drive sustains full H-bridge output even at low battery conditions during cranking, while cycle-by-cycle current limiting prevents coil overheating if the needle becomes mechanically jammed. The 24-SOIC footprint allows a single driver to handle both the tachometer and an adjacent small gauge such as the coolant temperature indicator, halving cluster BOM.
موصى به
Fuel Level Gauge
The MCZ33977EG is a natural choice for the fuel-level stepper gauge because its SPI protocol can daisy-chain with the other gauge drivers in the cluster, keeping the MCU pin count fixed regardless of cluster complexity. Phase-current magnitude scales linearly with the measured tank level, and the device's back-EMF sensing helps the cluster software calibrate pointer end-of-travel stops at every ignition cycle, eliminating the slow drift seen with simple PWM-driven gauges.
موصى به
Engine Coolant Temperature Gauge
Coolant-temperature gauges place long wires near ignition coils and injector harnesses, and the MCZ33977EG's differential H-bridge output cancels common-mode noise while the integrated flyback diodes clamp inductive transients. SPI messages stream at 100 Hz from the host ECU so pointer jitter is suppressed, and the 150C junction rating supports cluster placement directly above the transmission tunnel.
موصى به
Industrial Process Indicator
Outside the automotive market, the MCZ33977EG drives panel-mount stepper indicators in industrial process control where a -40C to +150C thermal envelope and SPI-controlled precision are required. Examples include valve-position indicators, dosing-pump stroke counters, and boiler draught gauges where the dual H-bridge can move a single pointer across a 270-degree sweep without external sense resistors.
موصى به
HVAC Stepper Damper Actuator
In automotive HVAC modules the MCZ33977EG operates bipolar stepper dampers that redirect airflow between face, feet, and defrost vents. The device's daisy-chainable SPI interface lets a single MCU control up to eight damper motors in parallel, reducing wiring harness complexity. The 5V supply rail can be derived from the same 12V-to-5V pre-regulator that powers the cluster, sharing the BOM across modules.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ MCZ33977EG — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | MCZ33977EGR2 | MCZ33937EFR2 | MCZ33977EF | MCZ33977EGR2G |
|---|---|---|---|---|---|
| Package | 24-SOIC (wide body) | 24-SOIC - same | 24-SOIC - same | 24-SOIC - same | 24-SOIC - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Topology | Dual H-bridge stepper gauge driver | Dual H-bridge stepper gauge driver - identical | Dual H-bridge, similar SPI control | Dual H-bridge - identical | Dual H-bridge - identical |
| Control Interface | SPI | SPI - identical | SPI - identical | SPI - identical | SPI - identical |
| Supply Voltage | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V |
| Fault Diagnostics | Open-load, short-to-batt, short-to-gnd, thermal shutdown | Same diagnostics | Same diagnostics | Same diagnostics | Same diagnostics |
| RoHS / JESD-609 | Compliant, e3 (matte tin) | Compliant, e3 | Compliant, e3 | Compliant, e3 | Compliant, e3 |
أبرز الفروقات
- Dual H-bridge on a single 24-SOIC body reduces cluster BOM (مقابلMCZ33937EFR2)
- Standard SPI daisy-chain support for cluster scaling (مقابلMCZ33977EGR2G)
- Matte-tin (e3) terminal finish for lead-free assembly (مقابلMCZ33977EGR2)
ملاحظات التصميم
Estimated: at V_PWR=5V with both H-bridges delivering 150 mA continuous per phase the IC can dissipate roughly 0.5W. Across the full -40C to +150C junction range this is well within the SOIC thermal envelope, but if the design drives coils continuously at >200 mA add a copper pour on the VPWR/PGND pins to keep theta_JA below 60 C/W on the cluster PCB. Use 10 uF X7R bypass on each VPWR pin placed within 5 mm of the SOIC body.
Keep motor traces short and away from sensitive analog return paths. The 24-SOIC thermal pad is absent on this package, so route VPWR and PGND as wide traces (>=0.5 mm) on opposite sides of the SOIC to provide star-grounding for the two H-bridges. Place the SPI lines (SCLK, MOSI, MISO, CS) on a separate inner layer with ground guard traces to keep motor switching noise from coupling into the host MCU's SPI peripheral.
Do not exceed 5.5V on VSUP or VPWR. The 33977 does not include over-voltage protection, so a load-dump event reaching >18V on the upstream 12V bus will require a TVS clamp (such as SMBJ16A) ahead of the 5V pre-regulator to prevent catastrophic damage. Always assert RESET for at least 100 us after power-up before initiating SPI transactions to avoid spurious fault latches.
For wire harnesses longer than 100 mm from the 33977 SOIC body to the gauge coil, add a 100 ohm resistor in series with each OUTx pin and a 1 nF X7R capacitor to ground (snubber) to suppress ringing on the OUTx edges. The internal back-EMF comparator can mis-trigger on ringing longer than 50 ns, so this RC snubber is critical in dashboards where the gauge is mounted on the tip of the cluster while the driver PCB sits on the back shell.
معلومات الامتثال
RoHS compliance inferred from JESD-609 e3 matte-tin terminal finish and AEC-Q100 automotive temperature grade -40C to +150C junction. REACH and conflict-minerals status set to compliant per typical NXP automotive product declarations; verify with manufacturer compliance letter for full PPAP submission.
