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NXP Semiconductors MC33912BACR2
- Part No.:
- MC33912BACR2
- Manufacturer:
- NXP Semiconductors
- Category:
- Power Management - Specialized
- Package:
- 32-LQFP
- Datasheet:
-
MC33912BACR2.pdf
- Description:
- IC SYSTEM BASIS CHIP 32LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,654
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Product details
Overview
MC33912BACR2 from NXP Semiconductors is a LIN System Basis Chip (SBC) integrating a LIN 2.0/2.1 transceiver, 5.0 V/60 mA LDO regulator, two 50 mA high-side switches, two 160 mA low-side switches, four high-voltage wake-up/analog inputs, and current sense functionality - all in a single 32-pin LQFP package. It serves as the central power, communication, and I/O interface for automotive body control modules driving DC motors and sensors.
For engineers reviewing the MC33912BACR2 datasheet, MC33912BACR2 pinout, MC33912BACR2 application, or MC33912BACR2 equivalent, this device supports SPI-controlled diagnostics, configurable window watchdog, LIN bus wake-up from Sleep/Stop modes, and analog multiplexed voltage sensing - critical for door, seat, mirror, and climate control subsystems requiring AEC-Q100-compliant integration.
Technical Context
The MC33912BACR2 implements a SMARTMOS-based architecture with integrated LIN physical layer compliant to SAE J2602-2 and ISO 17987-4, supporting up to 100 kbps with selectable waveshaping. Its dual-domain power system separates VS1 (logic/regulator supply) and VS2 (high-side driver supply), enabling independent fault management and reverse-battery protection via external diodes.
SPI communication operates at up to 4.0 MHz with full-duplex capability and hardware-level CS-driven tri-state control on MISO. The device features three operational states - Normal (full functionality), Sleep (VDD off, wake-up via LIN/Lx/cyclic sense), and Stop (VDD on, limited current, wake-up via CS/LIN/Lx/cyclic reset) - each with distinct current consumption profiles and diagnostic flag sets.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LIN Compliance | SAE J2602-2, ISO 17987-4, LIN 2.0/2.1 - ensures interoperability with automotive master nodes and conformance to EMC immunity/emission requirements. |
| VDD Regulator | 5.0 V ±5%, 60 mA max output - powers MCU peripherals and provides low-voltage reset (LVR) with 4.5 V threshold and hysteresis. |
| HS Switches | 2 × 50 mA high-side outputs with 7 Ω RDS(on) @ 25°C - suitable for Hall sensor biasing and small solenoid control with overtemperature shutdown at 160°C. |
| LS Switches | 2 × 160 mA low-side outputs with 2.5 Ω RDS(on) @ 25°C - drive DC motors and relays with active energy clamping up to VSUP +5.0 V. |
| Wake-up Inputs | 4 × high-voltage digital/analog inputs (L1–L4), 18–40 V tolerant - support contact monitoring and battery-sensed wake-up without external level-shifting. |
| Current Sense | Differential ISENSEH/ISENSEL inputs with 29×/14× gain selection - enables real-time motor current feedback with ±15 mV input offset and 70 dB CMRR. |
| Operating Temp | -40°C to +125°C ambient - qualified per AEC-Q100 Grade 1, enabling deployment in engine bay-adjacent and interior body modules. |
Pinout & Package
MC33912BACR2 is housed in a 32-pin LQFP (7 mm × 7 mm, 0.8 mm pitch) with exposed thermal pad. Pin assignments follow NXP's standardized SBC layout: VS1/VS2 power domains separated, dedicated AGND/LGND/PGND planes, and SPI/LIN/IRQ/RST signals routed to minimize noise coupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| HS1, HS2 | High-side switch outputs | Drive loads referenced to battery (VS2); internally protected against overcurrent, short-circuit, and overtemperature. |
| LS1, LS2 | Low-side switch outputs | Sink up to 160 mA; feature active clamp during inductive turn-off and open-load detection. |
| L1–L4 | Wake-up/analog inputs | Accept 18–40 V inputs; configurable as digital wake sources or 4-channel analog multiplexer inputs with selectable divider ratios. |
| VSENSE | Battery voltage monitor | Direct connection to battery line with internal 5.25× divider; self-protected against reverse polarity. |
| HVDD | Hall sensor supply | Switchable 5.0 V output (±2% matching to VDD); requires 1–10 µF ceramic capacitor with 0.1–5 Ω ESR. |
| VDD | Main regulator output | Primary 5.0 V supply for MCU and logic; requires 2–100 µF capacitor with 0.1–10 Ω ESR and supports 60 mA load. |
| ISENSEH / ISENSEL | Current sense differential inputs | Measure motor phase current with programmable gain (29× or 14×); reject common-mode noise up to 3.0 V. |
| LIN | LIN bus transceiver I/O | Single-wire half-duplex interface; supports dominant/recessive states, wake-up detection, and J2602-compliant undervoltage thresholds. |
Key Features
| Feature | Design Value |
|---|---|
| Configurable window watchdog | Timing set via external resistor (20–200 kΩ) yielding 8.5–108 ms period; disables on WDCONF pin open - prevents MCU lockup without fixed timeout constraints. |
| SPI diagnostics interface | Full-duplex 4.0 MHz operation with register-mapped status flags (HSSR, LSSR, LINSR) - enables real-time fault reporting of HS/LS/LIN events without polling overhead. |
| Integrated analog multiplexer | Routes L1–L4 and VSENSE to ADOUT0; supports temperature sensing (ADOUT0 = 2.8 V @ 25°C, 10.5 mV/K gain) - eliminates need for external ADC or signal conditioning. |
| Three-power-state architecture | Normal (4.5 mA typical), Stop (62 µA @ 13.5 V), Sleep (33 µA @ 13.5 V) - extends battery life in always-on vehicle systems while retaining fast wake-up response. |
| LIN transceiver with waveshaping | Adjustable rise/fall times via internal circuitry; disable option enables >100 kbps data rates - balances EMC compliance and high-speed diagnostics in constrained wiring harnesses. |
Applications
| Door Module Control | Seat Position Adjustment |
|---|---|
Use Scenario: Power window lift, mirror fold/unfold, and door lock actuation in automotive door modules. IC Role / Device Role / Timing Role: MC33912BACR2 acts as the primary LIN slave node, managing HS/LS switching for motor direction control, current sensing for stall detection, and LIN wake-up from sleep during key-fob proximity events. Use Value: Integrates 5 V regulation, LIN PHY, and dual HS/LS drivers - reduces BOM count by 4+ discrete ICs and eliminates external current-sense amplifiers. | Use Scenario: Motorized seat fore/aft, recline, and lumbar adjustment with occupancy sensing feedback. IC Role / Device Role / Timing Role: MC33912BACR2 supplies regulated 5 V to seat position sensors, drives bidirectional DC motors via LS1/LS2 PWM, and monitors current to detect mechanical binding or end-of-travel. Use Value: On-chip analog multiplexer reads seat occupancy sensor voltage (Lx inputs) and battery voltage (VSENSE) - avoids external voltage dividers and improves measurement accuracy. |
| Rain/Light Sensor Interface | Climate Control Panel |
Use Scenario: Signal conditioning and LIN communication for ambient light and rain-drop detection modules mounted on windshield. IC Role / Device Role / Timing Role: MC33912BACR2 conditions analog outputs from photodiode and capacitive rain sensors using L1–L4 inputs and ADOUT0, then reports status over LIN to body controller. Use Value: Built-in 4-channel analog mux with 0.8 V hysteresis on Lx thresholds enables robust wet/dry state detection without software debouncing. | Use Scenario: Fan speed control, HVAC damper actuation, and display backlight dimming in cabin climate systems. IC Role / Device Role / Timing Role: MC33912BACR2 drives small BLDC fans via HS1/HS2 PWM, senses motor current for closed-loop speed regulation, and supplies 5 V to touch-panel microcontroller. Use Value: Integrated current sense amplifier with 70 dB CMRR rejects EMI from nearby high-current fan drivers - improves current measurement fidelity in noisy environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LIN SBC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC33912G5AC | 2.5-generation revision with enhanced ESD (±6 kV on LIN), improved ISO 7637-2 pulse 3b immunity, and lower LIN EMC emissions. | Targeted for new designs requiring higher EMC robustness in premium vehicle platforms; same pinout and firmware compatibility. | Select MC33912G5AC when J2602 conformance, LIN bus noise immunity, or field-reliability under transient stress are top priorities. |
| TLF35584ESV50 | Infineon LIN SBC with 3.3 V VDD output, integrated CAN transceiver, and ASIL-B functional safety support - no current sense or HV analog inputs. | Used in safety-critical clusters where CAN+LIN coexistence and ISO 26262 compliance are mandatory; lacks motor pre-driver capability. | Choose TLF35584ESV50 only if CAN interface and ASIL-B certification are required; not a functional replacement for motor control roles of MC33912BACR2. |
Compared with MC33912G5AC, the MC33912BACR2 offers identical core functionality but lower EMC/ESD performance; compared with TLF35584ESV50, it provides superior motor drive integration and analog sensing at the cost of safety certification and CAN support - making MC33912BACR2 optimal for cost-sensitive, non-safety body electronics.
Availability
MC33912BACR2 is available at Aetrix Electronics and suitable for automotive door modules, seat control systems, climate panels, and lighting control units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MC33912BACR2 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-grade mixed-signal ICs.
The MC33912BACR2 belongs to NXP's System Basis Chip product line, designed specifically to consolidate power management, LIN communication, and intelligent I/O into single-package solutions for automotive body electronics - reducing system complexity and improving reliability.
FAQ
What is the operating temperature range supported by the MC33912BACR2?
The MC33912BACR2 is rated for -40°C to +125°C ambient temperature operation and qualified to AEC-Q100 Grade 1 standards. This range covers under-hood and interior automotive environments, including door modules and seat controls where thermal cycling and sustained high temperatures occur. Junction temperature limits extend to 150°C with thermal shutdown activation at 160°C to protect internal circuitry.
Does the MC33912BACR2 support LIN 2.1 and SAE J2602-2 conformance?
Yes, the MC33912BACR2 fully complies with LIN Protocol Specification 2.0 and 2.1, as well as SAE J2602-2 conformance testing requirements. Its LIN physical layer includes J2602-specific features such as undervoltage detection (5.0–6.0 V threshold), hysteresis (400 mV), and robust wake-up sensitivity (5.3–5.8 V), ensuring interoperability with certified LIN master nodes in production vehicles.
How does the current sense function work on the MC33912BACR2?
The MC33912BACR2 integrates a differential current sense amplifier with selectable gain (29× or 14× via CSGS bit) and auto-zero capability. ISENSEH and ISENSEL pins accept shunt voltage drops up to 3.0 V common-mode, providing analog output on ADOUT1. With 70 dB CMRR and 60 dB SVR, it delivers accurate motor current feedback even in electrically noisy environments - essential for stall detection and torque control in DC motor applications.
Can the MC33912BACR2 be used in both Normal and Sleep modes simultaneously?
No - the MC33912BACR2 operates in one of three mutually exclusive modes: Normal (full functionality), Sleep (VDD off, wake-up via LIN/Lx/cyclic sense), or Stop (VDD on, limited current, wake-up via CS/LIN/Lx/reset). Mode transitions are controlled by SPI commands and hardware events; simultaneous mode operation is not supported. The device automatically enters Sleep when VDD is disabled and LIN bus activity or Lx input transitions occur.
What external components are required for stable operation of the MC33912BACR2?
The MC33912BACR2 requires an external 2–100 µF capacitor on VDD (0.1–10 Ω ESR), a 1–10 µF capacitor on HVDD (0.1–5 Ω ESR), and a 10 kΩ series resistor on VSENSE for transient protection. For Lx inputs used digitally, 33 kΩ series resistors are mandatory per ISO 7637-2. No external pull-ups are needed on SPI lines due to internal configuration, but LIN bus requires a 20–60 kΩ pull-up to VSUP.
MC33912BACR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 32-LQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- System Basis Chip
- Current - Supply:
- 4.5mA
- Voltage - Supply:
- 5.5V ~ 27V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-LQFP (7x7)
MC33912BACR2 FAQ
1.How can I place an order for MC33912BACR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33912BACR2 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 MC33912BACR2 reliable?
The price and inventory of MC33912BACR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33912BACR2 is usually 5 days.
3.What payment methods are accepted for MC33912BACR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33912BACR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33912BACR2?
MC33912BACR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33912BACR2 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 MC33912BACR2?
For technical support, including MC33912BACR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33912BACR2 requirements.
6.How does Aetrix verify that MC33912BACR2 is sourced from the original manufacturer or authorized distributors?
All MC33912BACR2 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 MC33912BACR2 meets industry standards.
7.What is the process for return or replacement of MC33912BACR2?
All MC33912BACR2 units undergo pre-shipment inspection (PSI). If there is an issue with MC33912BACR2, 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 MC33912BACR2 part is unused and in its original packaging.
Return procedure for MC33912BACR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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