Safety System Basis Chip with Low Power, for ASIL D Systems

FS26 Active

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The FS26 family of automotive safety system basis chip (SBC) devices offer multiple power supply options designed to support entry and mid-range safety microcontrollers like the S32K3 series. FS26 devices also enable other microcontrollers targeting automotive electrification such as powertrain, chassis, safety and low-end gateway applications.

The FS26 features multiple switch mode regulators as well as LDO voltage regulators to supply the microcontroller, sensors, peripheral ICs and communication interface. FS26 offers a high-precision voltage reference available to the system and a reference voltage for 2 independent voltage-tracking regulators. In addition, various functionalities are available for system control and diagnostics such as analog multiplexer, GPIOS and selectable wake up events from I/O, long duration timer or SPI communication.

The FS26 is ISO 26262 compliant, covering ASIL B and ASIL D safety integrity levels. It features multiple fail-safe outputs, becoming a full part of a safety-oriented system partitioning, along with the latest on-demand latent fault monitoring.

Block Diagram

FS26 Safety SBC

FS26 Safety SBC with Low Power Fit for ASIL D
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Features

Power Management

  • 40 V DC maximum input voltage
  • Handle severe cranking operation (3.2 V battery) due to its BOOST controller
  • Low Power Off mode with very low sleep current (30 uA typ.)
  • Low Power Standby mode, VPRE active. LDO1 or LDO2 active selectable via OTP configuration (25 uA typ.)
  • Multiple switch mode regulators as well as LDO voltage regulators to supply the microcontroller, sensors, peripheral ICs and communication interface

System Solutions

  • System added value to save space and reduce complexity: LDT, AMUX, Dual Tracker, Vref
  • Programmable long duration timer (LDT) for system turn-off/wake-up control
  • Selectable wake-up sources from: WAKE/GPIO pins, LDT or SPI activity

Functional Safety

  • Scalable portfolio from automotive safety integrity levels ASIL B to ASIL D
  • Enable latent fault monitoring when system is running: ABIST on-demand
  • Independent monitoring circuitry
  • Dedicated interface for microcontroller monitoring
  • Simple and challenger watchdog function
  • Safety outputs with latent fault detection mechanism (RSTB, FS0B, FS1B)

Configuration and Enablement

  • LQFP48 pins with exposed pad for optimized thermal management
  • Permanent device customization via one-time-programming (OTP) fuse memory
  • Temporary OTP emulation mode for system development and evaluation
  • Ready to use S32K3 + FS26 hardware and software

Comparison Table

Part Number Description OTP Files and Report Safety Grade Package
MFS2613AMDA2AD S32K3 + FS26 EVB ASIL D S32K3X4EVB-Q257  DA2 Report, programming and configuration files ASIL D HLQFP48
MFS2613AMDA3AD S32K344 HVBMS Reference design DA3 Report, programming and configuration files ASIL D HLQFP48
MFS2613AMDA4AD S32K3 Body Control Module Reference design DA4 Report, programming and configuration files ASIL D HLQFP48
MFS2613AMDA6AD S32K344 48 V MC Development platform DA6 Report, programming and configuration files ASIL D HLQFP48
MFS2621AMDABAD AURIX TC38x, TC29x DAB Report, programming and configuration files ASIL D HLQFP48
MFS2613AMDDCAD FS26 + S32K324 + SAJ1110 + AG55X 5G T-BOX DDC Report, programming and configuration files ASIL D HLQFP48
MFS2633AMDALAD S32K3x8 and S32K396 MCU attach DAL report, programming and configuration file ASIL D HLQFP48
MFS2633AMDE4AD S32K396 Reference design DE4 report, programming and configuration file ASIL D HLQFP48
MFS2613AMDH3AD S32K344 400 V HVBMS Reference design (No VBST) DH3 report, programming and configuration file ASIL D HLQFP48
MFS2633AMDAHAD S32K396 BMS Reference Design DAH report, programming and configuration file ASIL D HLQFP48
MFS2633AMDAJAD S32K358 400 V and 800 V HVBMS Reference design DAJ report, programming and configuration file ASIL D HLQFP48
MFS2633AMDC3AD S32K358 400 V and 800 V HVBMS Reference design (wireless) DC3 report, programming and configuration file ASIL D HLQFP48
MFS2633AMDAKAD S32K358 400 V and 800 V HVBMS Reference design (No VBST) DAK report, programming and configuration file ASIL D HLQFP48
MFS2633AMDADAD RH850UA2x for BMS and ZCU Applications (VCORE = 1.09 V) DAD report, programming and configuration file ASIL D HLQFP48
MFS2623AMDAEAD RH850C, RH850P or RH850F for EPS, BMS, Motor control and DCDC applications (VCORE = 1.25 V) DAE report, programming and configuration file ASIL D HLQFP48
MFS2633AMDAMAD RH850UA2x for ADAS, Smart cockpit and 3.3 V applications (VCORE = 1.09 V) DAM report, programming and configuration file ASIL D HLQFP48
MFS2613AMDHKAD 5 V IO Systems for powertrain applications (BMS, Inverter) DHK report, programming and configuration file ASIL D HLQFP48

Note: Any FS26 OTP configuration where VBST is in front-end mode can also be used without it. Connect VBST_FB pin to the VSUP/VSUP_PWR node and follow our recommendations for the other unused pins in section ‘8. Connection of unused pins’ from the FS26 Product datasheet.

Note: Any FS26 OTP configuration where VMONEXT pin is enabled and assigned to the ABIST1 can also be used without it. Connect an external resistor bridge divider to apply 0.8 V at VMONEXT pin.

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