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NXP Semiconductors MC33972APEKR2
- Part No.:
- MC33972APEKR2
- Manufacturer:
- NXP Semiconductors
- Category:
- Specialized
- Package:
- 32-SSOP (0.295", 7.50mm Width) Exposed Pad
- Datasheet:
-
MC33972APEKR2.pdf
- Description:
- SWITCH DETECTION INTERFACE, 22-S
- Quantity:
- Payment:
- Shipping:
Inventory:1,878
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Product details
Overview
MC33972APEKR2 from NXP Semiconductors is a 32-pin SOICW-EP automotive-grade multiple switch detection interface IC with suppressed wake-up functionality. It monitors up to 22 switch inputs (8 programmable SPx + 14 SGx), delivers status via 3.3/5.0 V SPI, and provides analog multiplexing via AMUX output - enabling robust human-interface sensing in vehicle door modules, seat controls, and center consoles.
For engineers reviewing the MC33972APEKR2 datasheet, MC33972APEKR2 pinout, MC33972APEKR2 application, or MC33972APEKR2 equivalent, this page delivers verified electrical specs (VPWR = 5.5–26 V, IPWR(SS) = 100 µA max), real-world SPI timing (tVALID = 55 ns), wetting current options (2.0/16.0 mA), and validated alternatives for automotive body electronics design.
Technical Context
The MC33972APEKR2 implements dual-mode operation (Normal/Sleep) with hardware-suppressed wake-up logic that prevents false triggers during transients. Its internal 4.0 V reference comparator evaluates all 22 switch inputs against configurable thresholds, while the 22:1 analog multiplexer buffers and routes selected inputs to AMUX for MCU ADC sampling.
It integrates dedicated wetting current control (pulse/sustain modes), programmable scan timers (±10% accuracy), and open-drain INT/WAKE outputs with internal pull-ups - all powered from VPWR (5.5–26 V) and referenced to user-supplied VDD (3.1–5.25 V) for SPI level setting and SO driver bias.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range (VPWR) | 5.5 V to 26 V - supports full automotive battery range including cold-crank (6 V) and load-dump (26 V) conditions without external regulation. |
| Sleep Mode Supply Current | 100 µA max at VPWR = 10 V - enables long-term battery-off monitoring in door latch, ignition key, or trunk release systems. |
| Switch Input Count | 22 total: 8 programmable (SP0–SP7) + 14 ground-referenced (SG0–SG13) - eliminates discrete resistor networks and reduces BOM count by >15 components per node. |
| SPI Interface | 3.3 V / 5.0 V compatible, 6 MHz max clock - interoperates directly with common automotive MCUs (e.g., S32K, RH850, TC3xx) without level shifters. |
| Wetting Current Options | Selectable 2.0 mA or 16.0 mA - ensures reliable contact cleaning on low-energy switches (e.g., membrane keys) or high-resistance mechanical contacts. |
| Analog Multiplexer Output | AMUX pin provides buffered analog voltage (±10 mV offset) - allows MCU to measure potentiometer wiper position, thermistor resistance, or sensor voltage without external op-amps. |
| Interrupt Latency | 5.0 µs typical (Normal mode) - guarantees sub-10 µs response to switch closure for safety-critical functions like brake pedal detection. |
Pinout & Package
MC33972APEKR2 uses a 32-pin SOICW-EP (exposed pad) package, RoHS-compliant with EK suffix. The exposed pad must be connected to GND for thermal and EMI performance per NXP layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Common reference | Ground return for logic, analog, and switch-to-battery inputs - must be low-impedance connection to system GND plane. |
| SI, SCLK, CS, SO | SPI interface | Standard 4-wire SPI: SI receives commands, SO returns status, CS enables transfer, SCLK synchronizes data - all tolerant of 3.3/5.0 V logic levels. |
| SP0–SP7 (Pins 5–8, 25–28) | Programmable switch inputs | Configurable as switch-to-battery or switch-to-ground via SPI register - each supports wetting current and analog readback via AMUX. |
| SG0–SG13 (Pins 9–15, 18–24) | Ground-referenced switch inputs | Dedicated low-side switch detection - no configuration needed; all 14 inputs support analog multiplexing and wake-up capability. |
| VPWR (Pin 16) | Main power input | Battery supply input requiring external reverse-polarity and transient protection - powers all internal wetting/sustain currents and logic blocks. |
| VDD (Pin 31) | Logic supply | 3.3/5.0 V supply setting SPI I/O voltage levels and SO driver strength - removal disables SPI but preserves Sleep mode operation. |
| INT (Pin 29) | Open-drain interrupt | Active-low signal indicating switch state change - internal 15–100 µA pull-up to VDD; requires external pull-up if VDD is absent during Sleep. |
| WAKE (Pin 17) | Wake-up control | Open-drain output/input - HIGH in Sleep mode; falling edge wakes device; also accepts external wake signal when pulled LOW. |
| AMUX (Pin 30) | Analog multiplexer output | Buffered analog voltage from selected SP/SG input - enables MCU ADC measurement of resistive sensors or potentiometers without external circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Suppressed wake-up logic | Hardware-level filtering prevents false wake events from ESD, load dump, or battery ripple - critical for meeting ISO 16750-2 automotive immunity requirements. |
| Configurable wetting current | 2.0 mA or 16.0 mA selectable per channel - ensures reliable contact cleaning across diverse switch types (membrane, toggle, rocker) without overdriving. |
| Integrated analog multiplexer | 22:1 AMUX with ±10 mV offset and 250 µA drive capability - replaces external analog switches and op-amp buffers in sensor interface designs. |
| Programmable scan timer | Calibrated ±10% accuracy in Sleep mode - enables deterministic low-power polling intervals for battery-sensitive applications like keyless entry receivers. |
| Thermal shutdown protection | 155 °C trip point with 5–15 °C hysteresis - safeguards against overheating during sustained high-current wetting operation in enclosed modules. |
Applications
| Door Module Switch Monitoring | Seat Position Sensing |
|---|---|
|
Use Scenario: Real-time detection of window switch, lock actuator, mirror control, and interior light toggle in automotive door modules. IC Role / Device Role / Timing Role: Centralized switch interface IC handling 22 inputs with <5 µs interrupt latency and SPI status reporting every 10 ms. Use Value: Reduces microcontroller GPIO usage by 22 pins and eliminates 22 external pull-up resistors and debounce RC networks. |
Use Scenario: Reading multi-position seat adjustment switches (forward/back, recline, height) and memory button presses in premium seating systems. IC Role / Device Role / Timing Role: Programmable SP/SG inputs detect mechanical switch closures while AMUX reads potentiometer wiper voltage for continuous position feedback. Use Value: Enables single-chip solution for both discrete switch detection and analog position sensing - cutting PCB area by 35% vs. discrete implementation. |
| Center Console Control Panel | Trunk/Liftgate Release Interface |
|
Use Scenario: Managing HVAC, infotainment, and vehicle settings buttons on center console with tactile feedback and backlight control. IC Role / Device Role / Timing Role: SPI-connected switch monitor providing debounced status and wake-up capability to main MCU during sleep states. Use Value: Achieves <100 µA sleep current while maintaining instant wake-on-button-press - extending battery life in parked vehicle scenarios. |
Use Scenario: Detecting mechanical trunk release lever, liftgate kick-sensor activation, and emergency interior release switch. IC Role / Device Role / Timing Role: High-voltage-tolerant (−14 V to 40 V) switch interface with wetting current ensuring reliable operation despite corrosion or contamination. Use Value: Meets OEM requirements for >10-year field reliability in harsh under-vehicle environments with no maintenance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switch detection interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC33971AEK | 20-input version (no SP0–SP1), identical SOICW-EP package, same VPWR range and wetting current options. | Lacks two programmable inputs - suitable only where ≤20 switches are required and no mixed battery/ground topology is needed. | Select MC33971AEK when pin count and cost optimization outweigh need for full 22-input flexibility. |
| TLV8542IPWR | Low-power dual op-amp (not a switch detector); requires external comparators, multiplexers, and SPI interface logic. | Not functionally equivalent - demands significant additional circuitry and firmware to replicate basic MC33972APEKR2 functionality. | Only consider TLV8542IPWR for highly customized analog-sensing-only applications where integrated switch detection is undesirable. |
Compared with MC33972APEKR2, MC33971AEK offers identical architecture and qualification at lower channel count, while TLV8542IPWR requires full custom design to achieve even basic switch monitoring - making MC33972APEKR2 the optimal choice for production automotive body electronics.
Availability
MC33972APEKR2 is available at Aetrix Electronics and suitable for automotive door modules, seat control units, center console interfaces, and trunk release systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MC33972APEKR2 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 ASIL-B qualified power management and interface ICs.
The MC33972APEKR2 belongs to NXP's automotive body electronics portfolio, designed specifically to replace discrete switch interface circuits in vehicle interior control modules while meeting AEC-Q100 Grade 1 (-40°C to +125°C) requirements.
FAQ
What is the maximum switch input voltage tolerance for MC33972APEKR2?
The MC33972APEKR2 supports a switch input voltage range of −14 V to 40 V DC. This rating applies to both SP and SG inputs and covers automotive load-dump transients and reverse-battery conditions. External clamping is required for transients exceeding 40 V to prevent damage, as specified in Table 3 of the NXP datasheet Rev. 20.
Does MC33972APEKR2 support both 3.3 V and 5.0 V SPI communication?
Yes, MC33972APEKR2 supports 3.3 V and 5.0 V SPI communication through its VDD pin, which sets the logic level for SI, SO, CS, and SCLK. The device operates with VDD between 3.1 V and 5.25 V, and all digital interface parameters (e.g., VIH/VIL thresholds, SO drive strength) are guaranteed across this range per Table 4.
How does the wetting current function work on MC33972APEKR2?
The MC33972APEKR2 provides selectable wetting current of either 2.0 mA or 16.0 mA on all SP and SG inputs. It operates in pulse mode (15–20 ms duration) during switch closure detection and sustain mode for continuous contact cleaning. Configuration is done via the Wetting Current Register using SPI commands, as detailed in Section 6.3 of the datasheet.
Can MC33972APEKR2 operate without VDD applied?
MC33972APEKR2 can remain in Sleep mode without VDD, drawing only 100 µA from VPWR. However, SPI communication is disabled, and wake-up via CS or INT is not possible. Normal mode operation and register programming require VDD ≥ 3.1 V. Wake-up via WAKE pin remains functional even without VDD, as confirmed in Section 5.3 of the datasheet.
What is the purpose of the AMUX pin on MC33972APEKR2?
The AMUX pin on MC33972APEKR2 is the analog multiplexer output that provides a buffered voltage from any of the 22 switch inputs (SP0–SP7 or SG0–SG13) selected via the Analog Select Register. It enables direct MCU ADC measurement of resistive sensors (e.g., potentiometers, thermistors) with ±10 mV offset and 250 µA drive capability - eliminating external signal conditioning circuitry.
MC33972APEKR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 32-SSOP (0.295", 7.50mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Multiple Switch Detection
- Interface:
- SPI
- Voltage - Supply:
- 3.1V ~ 5.25V
- Supplier Device Package:
- 32-SSOP-EP
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
MC33972APEKR2 FAQ
1.How can I place an order for MC33972APEKR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33972APEKR2 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 MC33972APEKR2 reliable?
The price and inventory of MC33972APEKR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33972APEKR2 is usually 5 days.
3.What payment methods are accepted for MC33972APEKR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33972APEKR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33972APEKR2?
MC33972APEKR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33972APEKR2 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 MC33972APEKR2?
For technical support, including MC33972APEKR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33972APEKR2 requirements.
6.How does Aetrix verify that MC33972APEKR2 is sourced from the original manufacturer or authorized distributors?
All MC33972APEKR2 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 MC33972APEKR2 meets industry standards.
7.What is the process for return or replacement of MC33972APEKR2?
All MC33972APEKR2 units undergo pre-shipment inspection (PSI). If there is an issue with MC33972APEKR2, 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 MC33972APEKR2 part is unused and in its original packaging.
Return procedure for MC33972APEKR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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