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NXP Semiconductors MCZ33970EG
- Part No.:
- MCZ33970EG
- Manufacturer:
- NXP Semiconductors
- Category:
- Motor Drivers, Controllers
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MCZ33970EG.pdf
- Description:
- IC MTR DRV BIPLR 4.5-5.5V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,509
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Product details
Overview
MCZ33970EG from NXP (formerly Freescale) is a dual two-phase stepper motor gauge driver IC with SPI interface, 4096-step resolution, 340° pointer sweep, and air-core movement emulation for automotive instrument clusters. It integrates four H-bridge drivers, internal clock calibration, RTZ functionality, and operates from 5 V logic supply with VPWR up to 41 V.
For engineers reviewing the MCZ33970EG datasheet, MCZ33970EG pinout, MCZ33970EG application, or MCZ33970EG equivalent, this page delivers verified technical context, exact pin functions, real-world automotive gauge use cases, and validated alternative options - all grounded in Freescale's Rev. 3.0 documentation and official parametric data.
Technical Context
The MCZ33970EG implements a fully integrated state machine for dual-gauge control, using ROM-based microstepping timing tables to achieve fixed acceleration (4500°/s²) and velocity (400°/s) profiles without MCU intervention. Its analog microstepping delivers 12 steps per degree across 340° mechanical sweep.
It features dual independent H-bridge pairs (SIN0±/COS0± and SIN1±/COS1±), each capable of sourcing/sinking up to 40 mA continuously, with flyback clamping and overtemperature shutdown (155–180°C). The SPI interface supports up to 3 MHz operation with strict setup/hold timing and status feedback via SO.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | Dual two-phase stepper motor gauge driver with air-core emulation and RTZ capability |
| Pointer Resolution | 4096 discrete steady-state positions - enables precise analog-style needle positioning |
| Max Sweep Angle | 340° mechanical rotation - covers full automotive gauge arc (e.g., speedometer, tachometer) |
| Microstepping | 12 steps per degree - provides smooth, jitter-free pointer motion indistinguishable from air-core motors |
| Output Current | 40 mA continuous per H-bridge output - sufficient to drive standard MMT-licensed instrumentation motors |
| Supply Range | VPWR = 6.5–26 V (operational), VDD = 4.5–5.5 V - supports direct battery connection and 5 V logic rail |
| SPI Speed | Up to 3.0 MHz - allows fast position updates and diagnostics without MCU bandwidth penalty |
| Thermal Shutdown | 155–180°C junction - protects against coil short or ambient overheating in enclosed dash environments |
Pinout & Package
MCZ33970EG is housed in a 24-pin SOICW (wide-body) package with exposed thermal pad, Pb-free (EG suffix), rated for -40°C to +125°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–4, 21–24 | H-Bridge Outputs (COS0+, COS0−, SIN0+, SIN0−, SIN1−, SIN1+, COS1−, COS1+) | Eight dedicated half-bridge outputs driving two independent two-phase stepper motors; each sources/sinks current to generate sine/cosine coil fields |
| 5–8, 17–20 | GND | Eight ground pins - provide low-impedance return path for both power H-bridges and logic, plus thermal dissipation |
| 9 | CS | Active-low chip select - enables SPI communication and controls SO tri-state; internal pull-up ensures safe default state |
| 10 | SCLK | SPI serial clock input - clocks SI data on falling edge and SO data on rising edge; internal pull-down prevents spurious transitions |
| 11 | SO | SPI serial output - tri-stateable, outputs 16-bit status word first, then FIFO data; high-impedance when CS = high |
| 12 | SI | SPI serial input - accepts 16-bit command words MSB-first; ignored unless CS = low |
| 13 | RTZ | Multiplexed output - drives non-driven coil during Return-to-Zero sequence to ensure deterministic zeroing |
| 14 | VDD | 5.0 V logic supply - powers SPI interface, state machine, and internal regulator; must be decoupled near pin |
| 15 | RST | Active-low reset - forces internal logic to known default state; internal pull-up eliminates need for external resistor |
| 16 | VPWR | Battery voltage input - powers H-bridge drivers and internal regulators; withstands load dump up to 41 V |
Key Features
| Feature | Design Value |
|---|---|
| Air-core movement emulation | ROM-based acceleration/deceleration profile replicates analog motor inertia and settling behavior - reduces MCU processing load by >90% vs. open-loop step control |
| Calibratable internal oscillator | Software-tunable ±10% accuracy via 8 µs CS pulse - eliminates external crystal while maintaining tight pointer velocity control across temperature |
| Return-to-Zero (RTZ) with accumulator | Integrated sigma-delta ADC measures back-EMF during RTZ to detect true mechanical zero - avoids reliance on end-stop switches or optical sensors |
| Backward compatibility | Pin- and register-compatible with MC33991 - enables drop-in upgrade path for existing designs with enhanced damping and diagnostics |
| Dual independent gauge control | Separate position/velocity registers (POS0R/POS1R, VELR) and enable bits (PE0/PE1) - allows asynchronous operation of speedometer and fuel gauge with independent fault reporting |
| Comprehensive diagnostics | Status register reports real-time pointer position, velocity, direction, MOV0/MOV1 motion flags, overtemperature, VPWR OV/UV, and CAL faults - enables predictive maintenance in vehicle networks |
Applications
| Automotive Speedometer | Automotive Tachometer |
|---|---|
|
Use Scenario: Digital cluster displaying vehicle speed derived from CAN or wheel-speed sensor signals. IC Role / Device Role / Timing Role: Dual-gauge driver controlling speedometer needle position via SPI commands; uses internal state machine to execute smooth acceleration/deceleration profiles matching vehicle dynamics. Use Value: Eliminates need for external motion controller; 4096-step resolution ensures sub-km/h precision at full scale (240 km/h = 0.058°/step). |
Use Scenario: Engine RPM display synchronized to crankshaft position sensor data in ICE or hybrid powertrains. IC Role / Device Role / Timing Role: Second gauge channel (Gauge 1) driven independently to render tachometer needle with identical microstepping fidelity and air-core feel. Use Value: Enables single-chip dual-gauge solution - reduces BOM count vs. discrete drivers and avoids inter-channel timing skew. |
| Electric Vehicle Battery Gauge | Automotive Fuel Level Indicator |
|
Use Scenario: State-of-charge visualization in EV dashboards, updated dynamically based on battery management system telemetry. IC Role / Device Role / Timing Role: Gauge 0 configured for slow, damped movement mimicking analog voltmeter response to SOC changes - suppresses jitter from noisy voltage readings. Use Value: Analog microstepping (12 steps/degree) and programmable damping prevent distracting needle oscillation during regenerative braking events. |
Use Scenario: Mechanical fuel level indicator driven by resistive sender unit output, requiring stable, low-noise positioning. IC Role / Device Role / Timing Role: Uses RTZ function with sigma-delta ADC to auto-calibrate zero point at tank fill; maintains accuracy despite sender drift over time. Use Value: Eliminates manual calibration during assembly; RTZ accumulator tolerates ±10% sender tolerance without recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual stepper gauge driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC33991DW | Predecessor with identical pinout and register map but no air-core emulation, lower max velocity (300°/s), and no RTZ accumulator ADC | Lacks calibrated oscillator and sigma-delta RTZ sensing - requires external zeroing method and exhibits less natural pointer motion | Select only for legacy cost-sensitive designs where firmware cannot support MCZ33970EG's enhanced features |
| NCP5623T | Triple 200 mA LED driver with I²C interface - no stepper control, no microstepping, no RTZ, no gauge-specific state machine | Designed for RGB backlighting, not instrumentation motors - cannot replace MCZ33970EG in any gauge application | Not a functional alternative; included only as common mis-selection in distributor cross-reference systems |
Compared with MC33991DW, MCZ33970EG adds air-core emulation, tighter clock calibration, and RTZ ADC - enabling smoother motion and self-calibrating zero without hardware changes. NCP5623T serves entirely different functions and offers no gauge-driving capability.
Availability
MCZ33970EG is available at Aetrix Electronics and suitable for automotive instrument clusters, EV dashboard subsystems, and industrial panel meters requiring stable component supply, long lifecycle support, and AEC-Q100-compliant performance.
Supply support for MCZ33970EG 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, with deep expertise in embedded analog and mixed-signal solutions.
The MCZ33970EG belongs to NXP's automotive gauge driver product line, designed specifically to replace air-core meters with stepper-based digital clusters while preserving OEM-grade pointer dynamics and diagnostic rigor.
FAQ
What is the maximum operating temperature for the MCZ33970EG?
The MCZ33970EG has a specified operating junction temperature range of -40°C to +150°C, with thermal shutdown activating between 155°C and 180°C. Its 24-pin SOICW package features an exposed thermal pad and RθJA of 60°C/W, enabling reliable operation in under-hood or dashboard environments when mounted on thermally optimized PCBs.
Does the MCZ33970EG require an external crystal or oscillator?
No, the MCZ33970EG contains a built-in calibratable RC oscillator. It achieves ±10% frequency accuracy after software calibration using an 8 µs pulse on the CS pin - eliminating need for external timing components while maintaining precise pointer velocity control across temperature and voltage.
How does the MCZ33970EG implement Return-to-Zero (RTZ)?
The MCZ33970EG performs RTZ using its integrated sigma-delta ADC to monitor back-EMF on the non-driven coil during forced rotation. This RTZ accumulator counts induced voltage pulses to detect true mechanical zero without switches or optical sensors - a feature confirmed in Freescale's Rev. 3.0 datasheet Section 3.3 and Figure 8.
Is the MCZ33970EG pin-compatible with the MC33991?
Yes, the MCZ33970EG is backward pin- and register-compatible with the MC33991. Both share identical 24-pin SOICW footprint, SPI command structure, and memory map - allowing direct replacement in existing designs while enabling immediate access to improved damping algorithms, air-core emulation, and RTZ diagnostics.
What is the purpose of the eight GND pins on the MCZ33970EG?
The MCZ33970EG allocates eight dedicated GND pins (pins 5–8 and 17–20) to separately route high-current H-bridge return paths and low-noise logic grounds. This minimizes crosstalk between motor switching noise and sensitive analog/digital circuitry - a design requirement explicitly documented in the Functional Pin Description section of the Freescale MC33970 datasheet.
MCZ33970EG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Motor Type - Stepper:
- Bipolar
- Motor Type - AC, DC:
- -
- Function:
- Driver - Fully Integrated, Control and Power Stage
- Output Configuration:
- Half Bridge (8)
- Interface:
- SPI
- Technology:
- -
- Step Resolution:
- -
- Applications:
- -
- Current - Output:
- 40mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Voltage - Load:
- 6.5V ~ 26V
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
MCZ33970EG FAQ
1.How can I place an order for MCZ33970EG through Aetrix?
Please submit a Request for Quotation (RFQ) for MCZ33970EG on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MCZ33970EG reliable?
The price and inventory of MCZ33970EG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCZ33970EG is usually 5 days.
3.What payment methods are accepted for MCZ33970EG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCZ33970EG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCZ33970EG?
MCZ33970EG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCZ33970EG order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MCZ33970EG?
For technical support, including MCZ33970EG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCZ33970EG requirements.
6.How does Aetrix verify that MCZ33970EG is sourced from the original manufacturer or authorized distributors?
All MCZ33970EG products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MCZ33970EG meets industry standards.
7.What is the process for return or replacement of MCZ33970EG?
All MCZ33970EG units undergo pre-shipment inspection (PSI). If there is an issue with MCZ33970EG, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MCZ33970EG part is unused and in its original packaging.
Return procedure for MCZ33970EG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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