Infineon TLE9842QX Automotive Embedded Power IC for BLDC Motor Control

TLE9842QX Product Overview

The TLE9842QX is a highly integrated embedded power IC from Infineon Technologies in the MOTIX™ series, specifically designed for motor drive applications in automotive body control. This device is based on the Arm® Cortex®-M0 core and integrates a LIN transceiver, voltage regulator, and MOSFET gate driver. It operates on a 5V supply and supports a maximum junction temperature of 150°C.

The core advantage of the TLE9842QX lies in its single-chip solution. The on-chip integration includes a 32-bit microcontroller, 48KB Flash, 6KB RAM, high-side switches, low-side switches, and gate drivers for DC or brushless DC (BLDC) motor control. This device significantly reduces PCB area and BOM costs, making it ideal for automotive electronics modules with limited space and stringent reliability requirements.

The chip is fully AEC-Q100 qualified and features comprehensive diagnostic and protection functions (over-temperature, over-current, under-voltage, short-circuit protection), establishing it as a standard choice for automotive body motor control applications.

TLE9842QX Core Features

• High-Performance ARM Core: Integrates an Arm® Cortex®-M0 processor with a maximum frequency of 40MHz, delivering efficient control algorithm processing capability.

• Integrated Motor Drive: Features a built-in gate driver for PMOS high-side and NMOS low-side configurations, capable of directly driving small DC motors. It also integrates 2 high-side switches and 4 low-side switches.

• Non-Volatile Memory: Includes 48KB Flash (with ECC) and 6KB RAM, supporting fast and reliable program updates via LIN.

• Communication Interface: Integrates a LIN transceiver (compliant with LIN 2.2 and SAE J2602 standards) and a UART interface, enabling easy connection to the vehicle body network.

• Power Management: Built-in 5V low-dropout regulator (LDO) with external 5V/3.3V supply options, allowing direct power supply from a 12V automotive battery.

• Analog Peripherals: Integrates a 10-bit ADC (with 6 input channels) and 2 independent high-precision measurement units for current sensing and sensor signal acquisition.

• PWM Unit: Integrates a Capture/Compare Unit 6 (CCU6) and a General Purpose Timer unit (GPT12), supporting complex PWM signal generation and motor control modes.

• Protection and Diagnostics: Provides a programmable window watchdog, over-temperature protection, over-current protection, short-circuit protection, and under-voltage reset.

• Automotive Grade: Operating voltage range from 5.5V to 27V, extended junction temperature range from -40°C to 150°C, with ESD immunity of ±4kV (HBM).

• Package: Housed in a VQFN-48 package (7mm × 7mm) with a 0.5mm pin pitch, suitable for compact automotive module designs.

  
  

TLE9842QX Application Scenarios

Automotive Body Motor Control: Window lift motors, sunroof motors, wiper motors, electric seat adjustment motors.

• HVAC Systems: Blower motors, air flap actuators, cooling fan motors.

• Small Pump Applications: Fuel pumps, water pumps, air pumps, vacuum pumps.

• Lighting and Actuators: LED matrix control, relay drivers, small solenoid valves.

• Comfort Modules: Electric mirror folding/adjustment, power tailgate drive modules.

• Industrial and General Motor Control: Small DC motor and BLDC motor control equipment.

  
  

TLE9842QX Key Advantages

• Fully Integrated Single-Chip Solution: Integrates MCU, LIN, power supply, MOSFET drivers, and I/O, reducing external components by over 70% and significantly decreasing PCB size and system costs.

• Optimized for 12V Automotive Systems: Internal voltage regulator and protection circuitry withstand 40V transients, allowing direct battery power without additional power management ICs.

• Complete Motor Control Kit: Provides free configuration tools and driver libraries (including sensorless BLDC, FOC, and brushed DC motor algorithms), significantly shortening product development cycles.

• High Reliability and Diagnostic Capability: AEC-Q100 qualified with built-in multiple safety mechanisms (watchdog, CRC check, clock monitoring), suitable for safety-critical body electronics environments.

• Low-Power Modes: Supports sleep and stop modes with sleep current as low as 25µA, meeting automotive low quiescent current requirements.

• Small Package Size: 7mm × 7mm VQFN-48 package, suitable for mounting on the back of motors or in tight spaces.

  
  

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FAQ:

1. What is the Infineon TLE9842QX and what is it used for?
   The TLE9842QX is an automotive‑qualified embedded power IC that integrates a 32‑bit Arm Cortex‑M0 microcontroller, a LIN transceiver, MOSFET gate drivers, and power supply circuits into a single chip. It is specifically designed for intelligent brushless DC (BLDC) motor control in automotive applications such as HVAC blowers, water pumps, oil pumps, and radiator fans.

2. What makes the TLE9842QX a true "embedded power" solution for motor control?
   Unlike a discrete design that requires a separate MCU, gate driver, and voltage regulator, the TLE9842QX combines all three functions on one die. This integration reduces PCB area, simplifies supply‑chain management, and improves reliability by minimizing external interconnections. The on‑chip drivers can directly drive a 3‑phase MOSFET bridge for BLDC motors, eliminating the need for an external pre‑driver IC.

3. What kind of BLDC motors can the TLE9842QX control, and what control algorithms does it support?
   It is optimized for sensorless and sensor‑based BLDC motors up to approximately 200 W. The Cortex‑M0 core has enough processing power to run trapezoidal (six‑step) commutation as well as field‑oriented control (FOC) with a single‑shunt current‑sensing scheme. The integrated analog front‑end, including a 12‑bit ADC and programmable gain amplifiers, enables precise phase‑current measurement for smooth torque control.

4. How does the TLE9842QX handle communication with the vehicle network?
   The chip integrates a LIN 2.2 transceiver, making it a natural fit for LIN‑based automotive sub‑systems. The MCU runs a LIN protocol stack and responds to commands from the vehicle's main body controller (BCM) or zone controller. A built‑in auto‑addressing feature allows multiple identical LIN nodes to be distinguished without manual configuration.

5. What are the power supply features of the TLE9842QX? Can it operate directly from a 12 V car battery?
   Yes. The device includes a wide‑input voltage regulator that operates from 5.5 V to 28 V, with transient tolerance up to 40 V, directly from the automotive 12 V rail. It generates the 5 V and 1.5 V supplies needed by the MCU core and I/O internally, and also provides a 5 V output to power external sensors or a Hall‑effect encoder.

6. What memory and peripheral resources does the TLE9842QX provide?
   It features 36 KB of Flash memory, 4 KB of SRAM, and 512 bytes of EEPROM emulation Flash. Peripherals include a 12‑bit ADC with multiple channels, a general‑purpose timer, a capture‑compare unit for PWM generation, and GPIOs with interrupt capability. The memory size is tailored for compact LIN‑slave applications; the code is typically generated using Infineon's motor‑control libraries that optimize Flash usage.

7. What automotive qualifications does the TLE9842QX hold, and what is its temperature range?
   The device is AEC‑Q100 qualified and designed for harsh automotive under‑hood environments. It operates over an ambient temperature range of ‑40 °C to +150 °C (junction temperature up to 175 °C). This makes it suitable for placement directly on the motor housing or within the engine compartment where extreme temperatures are common.

8. How do I program and debug the TLE9842QX? What development tools are available?
   The chip is programmed via a single‑wire debug interface (SWD) through the LIN pin or dedicated debug pins. Infineon provides the TLE984x evaluation board and the "ConfigWizard" tool, which generates initialization code and motor‑control parameters graphically. The IAR Embedded Workbench and Keil MDK IDEs support the TLE9842QX, and Infineon's motor‑control software library (IMC) provides ready‑to‑use FOC and six‑step algorithms.

9. What protection and diagnostic features are built into the TLE9842QX?
   The device includes over‑temperature shutdown, over‑current and short‑circuit protection for the gate drivers, and under‑voltage lockout for the logic supply. A watchdog timer monitors the MCU operation, and the LIN transceiver reports bus faults. These features help meet functional safety requirements up to ISO 26262 ASIL‑A without an external supervisor IC.

10. What are the most common automotive applications for the TLE9842QX?
    It is widely used in automotive auxiliary motor drives: HVAC blowers, engine‑cooling fans, electric water pumps, oil pumps, fuel pumps, and active grille shutters. Its single‑chip integration, LIN communication, and high‑temperature capability make it a compact, reliable, and cost‑effective solution for distributed intelligent motor control in modern vehicles.