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NXP Semiconductors MCZ33972EWR2
- Part No.:
- MCZ33972EWR2
- Manufacturer:
- NXP Semiconductors
- Category:
- Specialized
- Package:
- 32-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
MCZ33972EWR2.pdf
- Description:
- IC INTERFACE SPECIALIZED 32SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,556
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Product details
Overview
MCZ33972EWR2 from NXP Semiconductors is a 22-input automotive-grade multiple switch detection interface IC with suppressed wake-up, SPI communication, and integrated 22:1 analog multiplexer. It supports 8 programmable (switch-to-battery/ground) + 14 switch-to-ground inputs, operates from 5.5–26 V VPWR, delivers 100 µA sleep current, and interfaces directly to 3.3/5.0 V MCUs via SPI up to 6 MHz.
For engineers reviewing the MCZ33972EWR2 datasheet, MCZ33972EWR2 pinout, MCZ33972EWR2 application, or MCZ33972EWR2 equivalent, key selection considerations include its dual-mode operation (Normal/Sleep), configurable wetting current (2.0/16.0 mA), open-drain INT/WAKE outputs, AMUX analog read capability, and -40°C to 125°C AEC-Q100 qualified operation in SOICW-32 package.
Technical Context
The MCZ33972EWR2 implements a dedicated switch monitoring architecture with two independent current source/sink paths per input: 16 mA pulse + 2.0 mA sustain for contact wetting, referenced to a stable 4.0 V internal comparator threshold. Its SPI interface uses 24-bit command/response framing with CS-edge latching of switch states and INT flag, supporting both parallel and daisy-chained multi-device configurations.
Sleep mode employs a calibrated scan timer (100–300 µs per channel, ±10% accuracy) to monitor all 22 inputs at ultra-low quiescent current (70 µA typical), while Normal mode enables full register programming-including programmable wake-up bits, wetting current selection, analog channel routing, and tri-state control-only when VDD is applied and CS is asserted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range (VPWR) | 5.5 V to 26 V - powers internal logic, wetting/sustain current sources, and protection circuitry; withstands automotive load dump transients up to 40 V (33972A variant) or 38 V. |
| Sleep Current (IPWR(SS)) | 70 µA typical - enables battery-sensitive automotive body electronics (e.g., door modules, seat controls) with multi-year standby life. |
| Switch Inputs | 22 total: 8 programmable (SP0–SP7) + 14 ground-referenced (SG0–SG13) - supports mixed switch topologies without external pull resistors. |
| Wetting Current Options | 16.0 mA (pulse) / 2.0 mA (sustain) - ensures reliable contact cleaning on high-resistance mechanical switches; selectable per channel via SPI. |
| SPI Interface | 24-bit frame, 6 MHz max clock - provides deterministic status reporting with INT assertion on state change; CS falling edge latches inputs and enables SO output. |
| Analog Multiplexer | 22:1 AMUX with buffered output (AMUX pin) - allows MCU ADC sampling of raw switch voltages for diagnostics or analog sensor interfacing. |
| Operating Temperature | -40°C to +125°C - qualified per AEC-Q100 Grade 1, suitable for under-hood and interior automotive ECUs. |
Pinout & Package
MCZ33972EWR2 is housed in a 32-pin SOICW (Wide-body Small Outline Integrated Circuit) package with exposed pad (EW suffix), measuring 20.0 mm × 7.5 mm × 2.65 mm, RoHS-compliant and Pb-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Common reference | Ground return for logic, analog, and switch-to-battery inputs; exposed pad must be connected to system GND for thermal and EMI performance. |
| SI (Pin 2) | SPI data input | Receives 24-bit command words from MCU; data latched on SCLK falling edge; requires clean transitions to avoid spurious writes. |
| SCLK (Pin 3) | SPI clock input | Drives internal shift register; SO data valid on falling edge; must remain LOW during CS transitions to prevent clock glitches. |
| CS (Pin 4) | SPI chip select | Active-Low enable: falling edge latches switch states and INT flag, enables SO driver; rising edge clears INT (unless switch changed during CS LOW). |
| SP0–SP7 (Pins 5–8, 25–28) | Programmable switch inputs | Configurable as switch-to-battery or switch-to-ground via SPI register; 4.0 V comparator threshold; tolerate -14 V to VPWR. |
| SG0–SG13 (Pins 9–15, 18–24) | Ground-referenced switch inputs | Dedicated switch-to-GND only; same 4.0 V threshold; support external sensor biasing via internal current sources. |
| VPWR (Pin 16) | Battery supply input | Main power rail (5.5–26 V); supplies all wetting/sustain currents and internal regulators; requires external reverse-battery and transient protection. |
| WAKE (Pin 17) | Open-drain wake-up output | Pulled HIGH in Sleep mode; falling edge wakes device; can drive external power supply EN pin; withstands up to 40 V externally. |
| INT (Pin 29) | Open-drain interrupt output | Asserted LOW on enabled switch state change; internal 15–100 µA pull-up to VDD; cleared on CS rising edge (with caveats). |
| AMUX (Pin 30) | Analog multiplexer output | Buffered voltage output of selected SP/SG channel; supports MCU ADC sampling for contact resistance or analog sensor reading. |
| VDD (Pin 31) | Logic supply input | 3.3/5.0 V supply setting SPI I/O levels, SO driver strength, and INT/CS pull-up current; removal disables SPI and wake-up from INT/CS. |
| SO (Pin 32) | SPI data output | Tri-state until CS falls; shifts 24-bit status word MSB-first; data valid on SCLK falling edge; SO driver disabled when VDD absent. |
Key Features
| Feature | Design Value |
|---|---|
| Suppressed wake-up architecture | Prevents false wake-ups from EMI or slow switch transitions by requiring sustained state change before asserting WAKE/INT. |
| Configurable wetting current | Software-selectable 16 mA pulse (15–20 ms) + 2.0 mA sustain per channel ensures reliable contact cleaning across aging or contaminated switches. |
| Dual operating modes | Normal mode enables full SPI register access and real-time monitoring; Sleep mode reduces current to 70 µA while scanning all 22 inputs every ~200 µs. |
| Integrated analog multiplexer | 22:1 AMUX with low-offset (<±10 mV) and low-offset current (<±2 µA) enables diagnostic voltage measurement without external op-amps or muxes. |
| Robust automotive interface | Withstands -14 V reverse battery, 40 V load dump (33972A), and operates over -40°C to +125°C ambient; meets ISO 11898-2 EMC requirements. |
| Multi-device SPI topology support | Supports parallel (shared SCLK/CS/SI, individual SO/INT) or serial (daisy-chained SI→SO) configurations for scalable switch monitoring across large vehicle domains. |
Applications
| Automotive Door Module | Seat Position Control |
|---|---|
Use Scenario: Monitoring 18+ mechanical switches (lock/unlock, window up/down, mirror adjust) in a vehicle door panel with minimal PCB space and strict sleep-current budget. IC Role / Device Role / Timing Role: Centralized switch detection interface replacing discrete comparators, pull resistors, and GPIO expanders; handles wetting current, debouncing, and SPI status reporting. Use Value: Reduces BOM count by >12 components; achieves 70 µA sleep current enabling 10+ year battery backup; eliminates need for external analog front-end for switch diagnostics. |
Use Scenario: Detecting position switches (forward/back, recline, lumbar) and memory preset buttons in power seats, requiring accurate analog feedback for wear-leveling algorithms. IC Role / Device Role / Timing Role: Switch monitor with integrated AMUX output feeding MCU ADC to measure contact voltage drop and estimate switch resistance degradation over time. Use Value: Enables predictive maintenance alerts based on rising contact resistance; sustains 2.0 mA wetting current to maintain low-resistance path despite lubricant migration or oxidation. |
| Steering Column Switch Cluster | Roof Console Controls |
Use Scenario: Managing 22 function switches (cruise control, audio, phone, wiper, lights) mounted on steering wheel and column, subject to vibration, ESD, and wide temperature swings. IC Role / Device Role / Timing Role: High-immunity switch interface with suppressed wake-up logic preventing false triggers from mechanical bounce or conducted noise on long harness runs. Use Value: Eliminates software debouncing overhead in MCU; withstands -14 V reverse battery and 40 V transients; operates reliably at -40°C for cold-climate vehicle start-up. |
Use Scenario: Controlling sunroof, map lights, and air recirculation switches in overhead console where space, weight, and quiescent power are critical constraints. IC Role / Device Role / Timing Role: Low-power switch monitor using Sleep mode scan timer to cycle through all inputs every 200 µs while drawing <100 µA from vehicle battery. Use Value: Extends vehicle parasitic drain budget by >50 µA vs. discrete solutions; integrates 22-channel routing into single SOICW-32 footprint; simplifies layout with no external pull resistors needed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switch detection interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC33973EKR2 | Same 32-pin SOICW-EP package; adds watchdog timer and enhanced ESD (±8 kV HBM); identical switch count and wetting current options. | Required where system-level watchdog supervision is mandated (e.g., ASIL-B compliant modules); higher cost due to added safety features. | Select MC33973EKR2 when functional safety certification (ISO 26262) or higher ESD immunity is required; otherwise MCZ33972EWR2 offers optimal cost/performance for standard body electronics. |
| TPS65381AQDAGQ1 | TI automotive PMIC with integrated 12-channel switch monitor; lacks analog multiplexer and configurable wetting current; different SPI protocol (16-bit) and package (HTSSOP-38). | Used in power management subsystems where switch monitoring is secondary to voltage regulation; not suitable for pure switch-detection-only designs. | Choose TPS65381AQDAGQ1 only if consolidating power sequencing and switch monitoring into one IC; MCZ33972EWR2 remains superior for dedicated, high-channel-count, analog-capable switch interfaces. |
Compared with MC33972EWR2, MC33973EKR2 adds watchdog and ESD robustness at higher cost, while TPS65381AQDAGQ1 trades switch-channel flexibility and analog capability for PMIC integration-making MCZ33972EWR2 the most balanced choice for standalone, high-fidelity automotive switch monitoring.
Availability
MCZ33972EWR2 is available at Aetrix Electronics and suitable for automotive body control modules, seat position systems, steering column clusters, and roof console applications requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.
Supply support for MCZ33972EWR2 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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in automotive electronics and functional safety.
The MCZ33972EWR2 belongs to NXP's automotive system basis chip (SBC) and interface IC portfolio, designed specifically for robust, low-power switch monitoring in vehicle body electronics where reliability, EMI immunity, and extended temperature operation are mandatory.
FAQ
What is the maximum switch input voltage tolerance for MCZ33972EWR2?
The MCZ33972EWR2 supports a switch input voltage range of -14 V to VPWR, with absolute maximum rating of 40 V on all SP/SG pins. This enables direct connection to automotive battery rails and tolerance of load dump transients without external clamping diodes-critical for under-hood and door module deployments where voltage spikes are common. The device itself is rated for VPWR up to 50 V.
How does MCZ33972EWR2 achieve suppressed wake-up functionality?
MCZ33972EWR2 implements suppressed wake-up by requiring a sustained switch state change-verified across multiple consecutive scan cycles in Sleep mode-before asserting the WAKE or INT signal. This prevents false triggers from EMI-induced glitches, mechanical switch bounce, or slow voltage transitions, ensuring only valid user inputs wake the system and preserve battery life in always-on automotive modules.
Can MCZ33972EWR2 measure analog voltages from switches, and how is it implemented?
Yes, MCZ33972EWR2 includes a 22:1 analog multiplexer (AMUX) that routes any SP or SG input to the AMUX pin for external ADC sampling. The buffered output exhibits ±10 mV offset and ±2 µA input offset current, enabling accurate measurement of switch contact voltage drop to detect wear, corrosion, or contamination-without adding external op-amps or mux ICs to the design.
What are the wetting current options on MCZ33972EWR2, and why are they important?
MCZ33972EWR2 offers selectable wetting current: 16.0 mA pulse (15–20 ms duration) followed by 2.0 mA sustain current per channel. This ensures reliable cleaning of oxidized or contaminated mechanical switch contacts-especially critical in automotive environments where long service life and infrequent maintenance are expected. Both values are programmable per channel via SPI.
Is MCZ33972EWR2 pin-compatible with other members of the 3397x family?
MCZ33972EWR2 shares the same 32-pin SOICW package and pinout with MC33972TEW/R2 and MC33972ATEW/R2, differing only in internal mask revision and minor electrical specs (e.g., 33972A supports 40 V max switch input vs. 38 V). All variants use identical pin functions, timing, and SPI protocol-enabling drop-in replacement within the same temperature grade (-40°C to +125°C) and package type.
MCZ33972EWR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 32-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- Switch Monitoring
- Interface:
- SPI Serial
- Voltage - Supply:
- 8V ~ 26V
- Supplier Device Package:
- 32-SOIC
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
MCZ33972EWR2 FAQ
1.How can I place an order for MCZ33972EWR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MCZ33972EWR2 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 MCZ33972EWR2 reliable?
The price and inventory of MCZ33972EWR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCZ33972EWR2 is usually 5 days.
3.What payment methods are accepted for MCZ33972EWR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCZ33972EWR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCZ33972EWR2?
MCZ33972EWR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCZ33972EWR2 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 MCZ33972EWR2?
For technical support, including MCZ33972EWR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCZ33972EWR2 requirements.
6.How does Aetrix verify that MCZ33972EWR2 is sourced from the original manufacturer or authorized distributors?
All MCZ33972EWR2 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 MCZ33972EWR2 meets industry standards.
7.What is the process for return or replacement of MCZ33972EWR2?
All MCZ33972EWR2 units undergo pre-shipment inspection (PSI). If there is an issue with MCZ33972EWR2, 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 MCZ33972EWR2 part is unused and in its original packaging.
Return procedure for MCZ33972EWR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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