Analog, Mixed Signal and Power Management MC33912 LIN System Basis Chip with DC Motor Pre-driver and Current Sense Applications MC33912 Simplified Application Drawing • Door module: window • Lift, mirror, door lock, seat control switch • Seat position motors, occupancy sensor • Rain and light sensor, light control, sun roof • Wiper, turning light, cruise control 33912 VBAT VSENSE HS1 VS1 VS2 • Climate: small motors, control panel • Engine control: sensors, small motors The 33912G5 is a Serial Peripheral Interface (SPI) controlled System Basis Chip (SBC), combining many frequently used functions in an MCU based system, plus a Local Interconnect Network (LIN) transceiver. The 33912G5 has a 5.0 V, 50 mA low dropout regulator with full protection and reporting features. The device provides full SPI readable diagnostics and a selectable timing watchdog for detecting errant operation. The LIN Protocol Specification 2.0 and 2.1 compliant LIN transceiver has waveshaping circuitry that can be disabled for higher data rates. The LIN Physical Layer included inside the 33912G5 is also compliant with the SAEJ2602 Rev. 2, protocol specification approved at many car OEMs. Two 50 mA high side switches, that can be used to drive LEDs, and two 150 mA low side switches with output protection that can drive relays, used in DC motor applications. All outputs can be pulse-width modulated (PWM). Four high voltage inputs are available for use in contact monitoring, or as external wake-up inputs. These inputs can be used as high voltage Analog Inputs. The voltage on these pins is divided by a selectable ratio and available via an analog multiplexer. LIN INTERFACE LIN VDD MCU PWMIN ADOUT0 ADOUT1 MOSI MISO SCLK CS RXD TXD IRQ RST LGND PGND AGND Overview L1 L2 L3 L4 LS1 M LS2 ISENSEH ISENSEL HVDD HS2 WDCONF Features Parametric Table • Full-duplex SPI interface at frequencies up to 4.0 MHz Part Number • LIN transceiver capable of up to 100 kbps with wave shaping • Two 50 mA high side and two 150 mA low side protected switches Max Input Voltage MC33912G5AC 40V MC34912G5AC Output Current Internally Limited (thermal protection) Temperature Range Package -40°C to 125°C 32 LQFP -40°C to 85°C Development Tools Part Number Description • Configurable window watchdog KIT33912G5DGEVME • 5.0 V low drop regulator with fault detection and low voltage reset (LVR) circuitry Easy to use kit that includes a friendly graphical interface, an MC33912G5EVB, and a USB to SPI adaptor. Documentation • Current sense module to help controlling Document Number Title Description • Switched/protected 5.0 V output (used for Hall sensors) MC33912 Data Sheet Presents the specifications for the product SG1002 Selector Guide Analog and power management device comparison SG187 Selector Guide Automotive device comparison • Four high voltage analog/logic Inputs Questions • Q: What are the 33912G5 key functions? • A: The device integrates a 5.0 V, 50 mA voltage regulator, a SPI interface for diagnostics and low power management, a LIN module, two High Sides and Low Sides, a current sense module, and four Wake-up inputs. Benefits • Q: What are the key features? • Very low emissive device • A: The 33912G5 offers a configurable window watchdog, a low power mode with cyclic wake-up feature, and a selectable LIN slew rate. The high sides and low sides have PWM capability up to 10 kHz and over-temperature and current limitation protection. The goal of the high precision differential amplifier with selectable gain is to sense the voltage drop over a shunt resistor and accurate current sensors. The device allows the monitoring of the battery voltage, wake-up pins voltage, and the die temperature. • Official release at many car OEMs • Reduced usage of external components due to the high EMI and ESD performance. • Internal 5.0 V regulator to supply microcontroller • Fail Safe protection • Low Power Management to minimize the battery discharge • Able to control an external relay Freescale Semiconductor is a leading provider for over 25 years of highperformance products using SMARTMOS™ technology that combines digital, power and standard analog functions. The company supplies analog and power management ICs for the automotive, consumer, networking and industrial markets. Freescale’s analog and power ICs complement our broad portfolio of micro controllers, microprocessors, ZigBee® technology, digital signal processors, sensors, with development tools and support to provide system solutions to customers. • Save hall sensor supply • Q: What is the compliancy of the device? • A: The product is LIN2.1 and SAEJ2602-2 compliant. • Q: What are the EMC performances of the device? • A: The 33912G5 successfully passes the "Common EMC requirements on LIN interfaces" specification defined by Audi, BMW, Daimler, Porsche, and Volkswagen. The LIN module shows a high robustness against ESD-61000-4-2 (±11kV) without a bus capacitor, and a very low level in emission (50 dBμV max at low frequency). Learn More: For current information about Freescale products, please visit www.freescale.com. Freescale™ and the Freescale logo are trademarks of Freescale Semiconductor, Inc. All other product or service names are the property of their respective owners. © Freescale Semiconductor, Inc., 2009 All rights reserved. Document Number: MC33912FS, Rev. 1.0