- No category
MC33907 and MC33908 Safe and efficient system basis chips (SBCs) Target Applications
Add to my manuals2 Pages
advertisement
Analog, Mixed Signal and Power Management
MC33907 and MC33908
Safe and efficient system basis chips (SBCs) for safety critical 32-bit MCU applications
Overview
The MC33907 and MC33908 are multi-output power supply integrated circuits
(ICs) with HSCAN and LIN transceivers optimized for safety critical applications.
Multiple switching and linear voltage regulators are available, including low power modes with various wake up capabilities. An advanced power management scheme is implemented to maintain high efficiency over wide input voltages and output current ranges.
Enhanced safety features and multiple fail-safe outputs enable safety oriented system partitioning in the MC33907 and MC33908 devices. A built-in enhanced high-speed CAN interface fulfills ISO 11898-2 and -5 standards. Local and bus failure diagnostics, protection and fail-safe operation modes are provided. The
LIN interface fulfills LIN protocol specifications 2.0, 2.1 and SAEJ2602-2.
DC/DC
Pre-Regulator
Buck Only or Buck Boost
Internal Power
FET
Power Management
Flexible (I/O)
Wake/INH
Auxillary Vreg—Vaux
MCU I/O Vreg—Vcca
MCU Core Vreg
Configuration Vcore
CAN Vreg
Analog MUX
Low Power Mode
Flexible (I/O)
Debug Pin
Advanced SPI
Functional Safety
Static and Dynamic Safe Pins
Fail-Safe State Machine
Communication
LIN/J2602 CAN High Speed
Target Applications
• Advanced power train
• Electric power steering
• Safety critical motor control applications
• Safety domain control
• Vehicle dynamic and chassis control
Features
• Power management scalability
Integrated switch for improved control and reliability
Optional boost feature to maintain functionality down to 2.7 V (support
LV124)
Dual DC/DC architecture for packaging cost efficiency
Family-compatible solution versus power delivery
Family pinout-compatible solution
• Energy efficiency
2.4 MHz dedicated Vcore DC/DC, with scalable current vs. P/N
Low power modes
Wake-up by I/Os, CAN and LIN
(up to 25 µA)
• Functional safety
Safety features to target ASILD applications combined with MCUs
Fail-safe and configurable state machine
Many protections and diagnostics
• Robust physical layers
Certification to LIN2.1 and ISO 11898-2-5 standards
Re-use existing CAN and LIN IP passing stringent EMC/ESD
• Easy to use
Ecosystem to lower development time and simplify access
Debug mode to save time during application development
• Ideal companion chip for high-end
32-bit MCUs
MPC5643L Qorivva 32-bit MCU
Key Features
• Enhanced safety block associated with fail-safe output
• Secure SPI interface
• Configurable digital I/Os through SPI registers, including monitoring of FCCU
• MUX output terminal for device internal analog signal monitoring and power supply monitoring
Additional Features
• ISO 11898 high-speed CAN interface compatibility for baud rates of 40 kb/s to 1 Mb/s
• LIN 2.1 transceiver with wave shaping
• High EMC immunity and ESD robustness
Freescale SBC Solutions
6.5 V Pre-regulator
MCU core supply VCore/2%
MC3907
1.5 A (Buck or Boost_440 kHz)
0.8 A (SPMS_2.4 MHz)
Auxiliary ECU supply Vaux/3% Up to 300 mA tracker/auxiliary
Can_5V Supply (VCAN) 100 mA
CAN interfaces 1
LIN interfaces
I/Os
Watchdog
LowQ Voff
1 optional LIN
6 (incl. F/S inputs)
Challenger
25 µA
AMUX and battery sense
Fail-safe
Package
Yes
Independent I/O
LQFP48eP
MC3908
2 A (Buck or Boost_440 kHz)
1.5 A (SPMS_2.4 MHz)
100 mA (int) +/-1% or 300 mA (ext.) +/-3%
Up to 300 mA tracker/auxiliary
100 mA
1
1 optional LIN
6 (incl. F/S inputs)
Challenger
25 µA
Yes
Independent I/O
LQFP48eP
Features to Support ISO 26262 System Requirements
Safety
Process
Safety
Hardware
Safety
Software
Safety
Support
• ISO 26262—fit ASIL D
Safety assessment of analog architecture and development process (ISO 26262)
Helps to reduce effort and time on ECU functional safety assessment
• Integrated safety architecture
Saves development effort and time as no additional software required (only one main MCU)
Independent voltage monitoring and fail-safe state machine
High HW diagnostic to cover SPF, LT, CCF
• Secured SBC and MCU software interactions
Multiples registers to help software diagnostics, including safe state machine
Safety mechanisms to secure SPI
Advanced watchdog challenger to secure MCU timing monitoring
• Safety documentation provided by Freescale
Application recommendations to combine MC33907 and MPC5643L
Safety manual, FMEDA and complete ecosystem to ease development, save time
Features to Support Energy-
Efficient Solutions
• Multiple output power supplies from 0.5 up to 2 amps of global current capability with scalable family approach
• Switching mode power supply (SMPS) dedicated to MCU core supply, 1.2 or 3.3 volts selectable through external voltage string
• Linear voltage regulator (3.3–5 V) dedicated to MCU I/O supply
• Linear voltage regulator dedicated to auxiliary functions (3.3–5 V selectable) or to sensor supply (Vcca tracker or independent 3.3–5 V)
• Highly flexible SMPS pre-regulator allowing non-inverting buck-boost or standard buck topologies. Overall device efficiency improvement
• Uses SMARTMOS technology that combines digital, power and standard analog functions
• LV124 low-voltage capable (down to 2.7 V
IN
), based on optional boost function to improve system availability during cranking pulses
• Multiple wake-up sources combined with ultra low power mode: CAN and LIN interfaces, local wake pins
• Battery voltage sensing before and after reverse battery protection
SafeAssure Program:
Functional Safety. Simplified.
The Freescale SafeAssure functional safety program is designed to help you simplify the process of achieving system compliance with functional safety standards in the automotive and industrial markets.
For more information, visit freescale.com/SafeAssure.
For more information, visit freescale.com/analog
Freescale, the Freescale logo, the Energy Efficient Solutions logo, Qorivva, SafeAssure and the SafeAssure logo are trademarks of Freescale Semiconductor, Inc., Reg. U.S. Pat. & Tm. Off. SMARTMOS is a trademark of Freescale Semiconductor, Inc.
All other product or service names are the property of their respective owners. © 2013, 2014 Freescale Semiconductor, Inc.
Document Number: MC33907_8FS REV 2
advertisement
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project