MCZ33970EG - Dual Gauge Driver IC with SPI, 24-SOIC | NXP
MPN: MCZ33970EG ✓ نشطMCZ33970EG نظرة عامة
A stepper motor gauge driver is a specialized motor driver IC that converts SPI commands from a microcontroller into the precise two-phase current waveforms that move a permanent-magnet rotor in automotive analog gauges. Compared with generic half-bridge or full-bridge motor drivers, gauge-specific drivers include integrated indexer logic, configurable microstepping, programmable damping algorithms to suppress pointer overshoot, and diagnostics for open/short detection on the H-Bridge coil outputs. The MCZ33970EG belongs to the motor driver IC family (motor driver -> motor & motion control -> power management IC -> semiconductor) and implements an improved damping algorithm that smooths pointer transitions between commanded positions.
Key features include SPI communication for command and diagnostic feedback, dual H-Bridge outputs capable of bipolar stepper motor excitation, programmable current levels for matching different gauge coil impedances, integrated flyback diodes for inductive load clamping, and an operating supply range compatible with 5V regulated logic. The device integrates enhanced pointer damping algorithms that reduce mechanical resonance in the gauge movement during rapid position changes. Operating junction temperature spans -40C to +150C, suiting the automotive under-dash environment.
The MCZ33970EG is used in instrument cluster applications driving air-core or d-copper stepper motors directly. The dual H-Bridge topology supports one stepper motor or two brushed DC loads per IC, and multiple devices can share the SPI bus to drive 3 to 5 gauges in a typical cluster. The wide operating temperature range and SPI programmability also make it suitable for industrial process indicators and HVAC control panels.
When designing with this part, keep SPI traces short and isolate the analog ground return for the H-Bridge outputs from the digital ground. Place bypass capacitors within 5 mm of the VCC and motor supply pins, and respect the absolute maximum ratings on inductive load clamping. The improved damping algorithm reduces but does not eliminate mechanical pointer overshoot; verify final pointer behavior on a representative gauge mechanism. This page synthesizes distributor inventory, drop-in alternatives, and design notes that complement the manufacturer datasheet.
بدائل مباشرة لـ MCZ33970EG — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
MCZ33971EG
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منها📋 بديل مرجعي (غير موجود في الكتالوج)
MCZ33972EG
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منها📋 بديل مرجعي (غير موجود في الكتالوج)
MCZ33970EG الحدود القصوى والخصائص الكهربائية
| Motor Type | Bipolar Stepper Motor / DC Brushed (dual H-Bridge) |
| Number of H-Bridges | 2 |
| Communication Interface | SPI (Serial Peripheral Interface) |
| Supply Voltage (Logic VCC) | 4.5 V to 5.5 V |
| Operating Temperature Range (TJ) | -40 C to +150 C |
| العلبة | 24-SOIC (300 mil / 7.5 mm body width) |
| نوع التركيب | Surface Mount |
| عدد الدبابيس | 24 |
| Integrated Flyback Diodes | Yes |
| Pointer Damping Algorithm | Improved (programmable) |
| Diagnostics | Open/short detection on coil outputs |
| Automotive Qualified | Yes (automotive cluster application) |
| حالة RoHS | Compliant |
| Lead-Free | Yes |
تكوين أطراف MCZ33970EG
| دبوس 1 | CS — SPI chip select (active low) |
| دبوس 2 | SCLK — SPI serial clock input |
| دبوس 3 | MOSI — SPI master-out slave-in data input |
| دبوس 4 | MISO — SPI master-in slave-out data output |
| دبوس 5 | VCC — 5V logic supply input |
| دبوس 6 | GND — Logic ground |
| دبوس 7 | OUT1A — H-Bridge 1 output A (stepper coil 1A) |
| دبوس 8 | OUT1B — H-Bridge 1 output B (stepper coil 1B) |
| دبوس 9 | NC — Not connected (per datasheet) |
| دبوس 10 | VS1 — Motor supply for H-Bridge 1 |
| دبوس 11 | GND_M1 — Motor ground return for H-Bridge 1 |
| دبوس 12 | NC — Not connected (per datasheet) |
| دبوس 13 | OUT2A — H-Bridge 2 output A (stepper coil 2A) |
| دبوس 14 | OUT2B — H-Bridge 2 output B (stepper coil 2B) |
| دبوس 15 | NC — Not connected (per datasheet) |
| دبوس 16 | VS2 — Motor supply for H-Bridge 2 |
| دبوس 17 | GND_M2 — Motor ground return for H-Bridge 2 |
| دبوس 18 | NC — Not connected (per datasheet) |
| دبوس 19 | FAULT — Diagnostic fault output (open drain) |
| دبوس 20 | RESET — Reset input (active low) |
| 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
MCZ33970EG مناسب لـ 6 التطبيقs: Automotive Speedometer and Tachometer Gauges, Automotive Fuel and Temperature Level Indicators, Process Control Panel Meters, HVAC and Building Automation Indicators, Motorcycle and Powersport Instrument Clusters, Marine Instrument Panel Gauges.
Automotive Speedometer and Tachometer Gauges
The MCZ33970EG's dual H-Bridge outputs and SPI-driven two-phase current waveforms directly drive the bipolar stepper motors behind automotive speedometer and tachometer pointers, replacing older air-core movements. The 4.5V to 5.5V logic interface connects directly to a 5V cluster MCU, while the motor supply rails can be powered from a separate 8V to 16V automotive bus. The integrated improved damping algorithm smooths pointer transitions when the speed or RPM signal changes rapidly, eliminating audible pointer flutter and reducing mechanical wear on the gauge mechanism. Designers typically use one MCZ33970EG per main gauge and a second IC for the smaller fuel and temperature indicators, sharing one SPI bus.
موصى به
Automotive Fuel and Temperature Level Indicators
The MCZ33970EG is ideal for fuel level and coolant temperature gauges where the pointer must move smoothly over a wide angular range in response to slow-changing sensor inputs. Its dual H-Bridge supports one stepper motor per IC, so designers commonly pair two MCZ33970EG devices - one for fuel and one for temperature - on a shared chip-select SPI bus. The -40C to +150C junction temperature range covers the under-dash thermal environment, while integrated flyback diodes clamp the inductive kick from the gauge coils without external Schottky components. Programmable damping lets the calibration engineer tune pointer response to match tank geometry and fluid slosh characteristics.
موصى به
Process Control Panel Meters
Industrial panel meters for pressure, flow, and level indication use bipolar stepper movements that benefit from the MCZ33970EG's integrated indexer and damping control. The SPI command interface allows the host PLC or industrial controller to drive multiple panel meters from a single bus, reducing wiring complexity in control cabinets. The wide -40C to +150C operating junction temperature suits unheated enclosures and outdoor process skids. Unlike raw H-Bridge drivers that require the host to generate two-phase step waveforms, the MCZ33970EG accepts high-level position commands and handles the commutation internally, simplifying PLC firmware development.
موصى به
HVAC and Building Automation Indicators
The MCZ33970EG fits setpoint and feedback indicators in commercial HVAC controllers and building automation panels, where smooth pointer motion conveys temperature or damper position to occupants. Its dual H-Bridge can drive one main temperature gauge plus one smaller fan-speed indicator per IC. The 5V logic interface connects directly to common HVAC MCUs, and the integrated flyback diodes keep the BOM lean for cost-optimized designs. SPI diagnostics allow remote detection of stuck pointers or open coil faults over the building automation network, reducing service calls for malfunctioning thermostats.
موصى به
Motorcycle and Powersport Instrument Clusters
Powersport vehicles including motorcycles, ATVs, and snowmobiles use compact instrument clusters with speed, RPM, and fuel gauges that must withstand vibration and temperature extremes. The MCZ33970EG's robust dual H-Bridge outputs and -40C to +150C operating range match these harsh environments. Its small 24-SOIC footprint simplifies integration into space-constrained cluster PCBs, and the integrated pointer damping reduces mechanical wear from vibration-induced overshoot. Designers can leverage the same SPI command structure shared with automotive clusters, accelerating firmware reuse across vehicle platforms.
موصى به
Marine Instrument Panel Gauges
Marine instrument panels for speed, RPM, fuel, and water temperature use bipolar stepper gauges with the same dual H-Bridge drive topology as automotive clusters. The MCZ33970EG's automotive-grade temperature range and integrated flyback protection suit the marine under-helm environment where humidity and temperature cycling stress electronics. Multiple MCZ33970EG devices can share a single SPI bus from the marine display controller, allowing expansion from a 2-gauge setup to a 5-gauge helm with the same firmware architecture.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ MCZ33970EG — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | MCZ33971EG | MCZ33972EG |
|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 24-SOIC (300 mil) | 24-SOIC (300 mil) - same | 24-SOIC (300 mil) - same |
| Number of H-Bridges | 2 | 2 | 2 |
| Communication Interface | SPI | SPI | SPI |
| Logic Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
| Operating Temperature (TJ) | -40 C to +150 C | -40 C to +150 C | -40 C to +150 C |
| Integrated Flyback Diodes | Yes | Yes | Yes |
| Pointer Damping | Improved (programmable) | Improved (programmable) | Improved (programmable) |
| Unit Price (qty 1000) | USD 4.25 | USD 4.50 (estimated similar tier) | USD 4.60 (estimated similar tier) |
أبرز الفروقات
- Integrated improved damping algorithm on-chip (مقابلDiscrete dual H-Bridge (e.g., L293D + external indexer))
- SPI command set with diagnostics (مقابلParallel-controlled gauge drivers)
- Integrated flyback diodes on both H-Bridges (مقابلDiscrete H-Bridge drivers without internal clamps)
ملاحظات التصميم
Place the VCC bypass capacitor (typically 100 nF ceramic plus 10 uF bulk) as close as possible to pin 5 to suppress logic transients when the H-Bridges switch. Keep the motor ground return (GND_M1, GND_M2) separated from the logic ground and join them at a single point near the IC. Short, wide traces on the H-Bridge output pins (OUT1A, OUT1B, OUT2A, OUT2B) reduce parasitic inductance that can stress the integrated flyback diodes during PWM commutation.
Estimated: at a continuous 200 mA per H-Bridge and a 1.5 V motor supply drop, each H-Bridge dissipates roughly 0.3 W, for a 1.5 W total package dissipation at full dual-channel load. The 24-SOIC (300 mil) package relies on PCB copper pour for heat removal; allocate at least 1 square inch of 2 oz copper on the motor supply pins to keep junction temperature rise within the 125 C ambient derating. Verify thermal performance on the final gauge cluster with thermocouple measurements under worst-case continuous pointer activity.
Do not connect the motor load supply (VS1, VS2) directly to the battery without reverse-battery and load-dump protection; the integrated clamps are sized for inductive flyback, not for 40 V load-dump transients. Always honor the minimum SPI clock high and low times specified in the datasheet when configuring the host MCU's SPI peripheral, especially at high bus speeds. Avoid leaving unused H-Bridge outputs floating - tie them to ground through a resistor if unused to prevent false fault triggering.
Route the SPI traces (CS, SCLK, MOSI, MISO) as a short bus with a ground reference plane beneath, and place a small series resistor (22 to 33 ohm) near the host MCU to damp ringing on long cables. The MISO line carries diagnostic feedback and should be tri-stated when CS is high to avoid bus contention when multiple MCZ33970EG devices share the SPI bus. Keep the FAULT pin pulled up to VCC with a 10 kohm resistor so the host MCU can detect open-drain fault conditions across the entire cluster.
معلومات الامتثال
RoHS and lead-free compliance confirmed by NXP product page and distributor data. AEC-Q100 status is not_qualified in this extracted snapshot - verify with NXP for the latest automotive qualification letter before use in safety-critical automotive subsystems. Halogen-free status not explicitly listed in verified data.
