Our approach in automotive ASIC developments
- APQP, PPAP according to ISO/TS16949
- Functional safety ISO26262 (ASIL B/C) compliance
- FMEA, FMEDA
- Testability definition early in development
- Systematic design (6σ) and verification flow with SOA checks, embedded in design environment
- EMC, ISO and ESD/LU compliance
- High test coverage (incl. bridging patterns, transitional patterns, …) levels
- Production test outlier detection (PAT, SBIN, …) and defect screening (Vstress, Iddq, …)
- AEC-Q100 qualification
- Robustness validation and safe launch
- Strong OSAT and foundry partners with automotive qualified processes with long longevity
- Failure analysis and 8D reporting
A TMR angle sensor interface ASIC for in-vehicle applications with dynamic compensation for offset, gain and distortion errors to achieve very high angle accuracy performance. The SiP sensor module is connected directly (no PCB) to the automotive wiring harness.
This ASIC has an auto-calibration sequence that allows to compensate for non-idealities introduced by the magnet and mechanical (e.g. tilting) assembly process. It includes a high accuracy read-out chain (16-bit AFE), system diagnostics and HV tolerance on VCC (-18, +27V) and digital interface pins (-6V, +18V). Several diagnostic measures have been implemented to achieve ASIL-B safety level (SEooC).
High vibration tolerances and high ambient temperature (160degC operating temperature) do not allow the use of a PCB. Therefore a SiP (System-in-Package) solution is delivered with integrated SMD components for ESD/EMC, TMR sensor and the ASIC.
- Best angle accuracy (0.2deg) on the market (2016) through dynamic compensation (during rotation)
- High angle dynamic profile (accelerations upto 300krpm/s)
- High EMC/ESD durability with only in-package components: ESD (ISO10605) and EMC (ISO11452, ISO7637, CISPR25)
- Wheatstone bridge differential chopped SINE and COSINE readout channels with 16-bit Delta-Sigma ADCs
- Active slope control (load dependent self-adjustment)
- “Beyond” AECQ-100 Grade-0 (-40C to 175C)
- Functional safety ISO26262 ASIL-B (SEooC)
- Output protocols: SENT, PWM, UVW (Hall emul.), ABZ
- 0.18um BCD process
- Embedded DSP
- Decimation / Filtering
- ATAN calculation (using CORDIC)
- Static compensation
- On-chip calibration procedure for EOL testing
- Calculates sensor distortion components (HD1..HD3)
- Can also compensate mechanical non-idealities like magnet tilting etc
- Dynamic compensation
- Active during normal operation (while rotating)
- Compensates for drifts of gain, offset, orthogonality, HD4 distortion parameters
- Test & memory control Digital diagnostics for ASIL B
The ASIC interfaces with 3 half-bridge TMR (Tunnel Magneto Resistance) sensors to monitor the speed of a rotating magnetized subject, commonly used in automotive safety critical applications like ABS (see picture), electronic parking breaks or hill-hold control.
The design supports True 0-Hz (standstill) functionality upto 20kHz. Automotive compliance is guaranteed through careful EMC/ESD aware design and compliance to ISO pulses. Through an OWI (One-Wire-Interface), this ASIC can be programmed and diagnosed in the field. Low noise, high-gain amplifiers are integrated to support a wide gain range from 1.5V/V to 192V/V.
This mixed-signal ASIC includes on-chip DSP sequencer to distinguish between rotation/vibration while compensating offset and tracking the gain.
- TMR magnetic sensor (3 half-bridges)
- Wide input range (5mV to 600mV) with DC offset of 200mV
- Extremely low jitter output over entire signal range (<0.1%)
- On-chip DSP to distinguish between rotation/vibration
- Functional safety ISO26262 ASIL B
- Miswiring of supply (-18V to +24V)
- System level ESD pulses (4kV)
- EMC requirements (EMI,EME, ISO-pulses )
- One-Wire-Interface (OWI), AK, PWM, current modulation
- 2- or 4-pins package
- 0.18um BCD process
The ASIC contains all major automotive communication protocols like CAN (HS-CAN, SW-CAN), J1850, PWM and OWI. It interfaces with the car ECU (Engine Control Unit) and has a HV (High-Voltage) switch matrix to support multiple car brands.
The output driver includes a D/A converter, an output buffer, open-circuit detection circuits and bi-directional data transfer circuits. The main challenges in this development were accuracy and settling requirements in combination with the wide range of capacitive loading and leakage at high temperatures.
- 12 bit resolution / 13 bit accuracy
- Load resistor/load capacitor: >5kΩ/330pF –600nF
- Step response time (10% to 90%): < 200μs
- dynamic element matching techniques
- class AB operation with current boosting
- Ratiometric 4.5V -16V
- Designed for EMC
- -40 – 170 ºC
- 0.45um CMOS
The ASIC generates the required voltages for ignition, startup and normal operation of the lamps. Included are the igniter, H-bridge and the H-bridge driver, which operates the lamp in AC for higher durability.
A power regulation loop generates an accurate PWM power control to the lamp up to 35W. The loop stability of the whole system is analyzed using Matlab.
- Drive and control the ballast for a XENON HID head lamp from a 12V battery
- Asynchronous DC-DC controller
- Over/under-voltage, over-current and over-temperature protection
- EMC, Schaffner pulse immunity (ISO 7637-2)
- Max. 36V power supply
- -40°C to 150°C
- 0.35um BCD 50V technology
The low-power GMR (giant magneto resistive) readout ASIC is co-integrated with the GMR sensors on a single die and it is used for crankshaft and transmission speed and direction sensing.
It contains a speed and a direction analog readout channel, a multiplexed SAR ADC and a digital processing unit, containing an adaptive algorithm for vibration and air gap variation tolerant sensing and direction detection and PWM communication with the car’s control unit.
- GMR (Giant Magneto Resistive) sensor readout ASIC
- Wheatstone bridge signal conditioning
- Digital processing included
- Air gap variation tolerant
- Vibration tolerant sensing
- Direction detection
- Dynamic self calibration
- Low power (2.5V Vdd in 0.65um technology)
- Low jitter performance
- High sensitivity and large air gap capability
- Large frequency range (up to 15 kHz)
- Three-wire digital voltage interface (PWM)
- VHDL-AMS modelling of the sensor by ICsense
- Multiplexed 200 kS/s 12-bit SAR ADC
- AEC-Q100 qualified
- Temperature range -40°C to 200°C
- 0.65um BiCMOS technology
- Module style package with two integrated capacitors:
- 4.7nF between Q and GND
- 47nF between Vs and GND
This high-voltage ASIC drives the solenoid coil of a fuel injection unit found in modern car engines. The fuel injection unit requires both timing and voltage programmability to optimally control the combustion process of the engine.
The ASIC contains over-current and over-temperature protection and reliable-injector diagnosis (valid bit). It is designed in an OnSemi I2T100 technology qualified for automotive applications.
- Voltage 65V boosted
- Currents of up to 25A (offchip driver) with 0.5% precision
- Timing of 126usec to 2000usec with 0.5% precision
- Power supply system, diagnosis and protection features
- I2T100 technology (0.7um CMOS with HV extensions)
- Temperature range of -40°C to 125°C
The IC permanently measures battery voltage, battery current, battery temperature and battery lifetime to compute the State-Of-Charge (SOC) and the State-Of-Health (SOH) of batteries.
The ASIC targets applications such as high-voltage battery systems (Li-Ion) for vehicles (trains, cars, motorbikes, …) as well as Lead-Acid battery systems (12V, 24V and 42V). This ASIC has been developed as a general purpose platform for battery control applications.
- Accurate current, voltage and temperature measurements of battery
- State-of-Health, State-of-Charge computation
- High flexibility to fit many different applications through external component selection
- Automotive qualified: temperature, six sigma, EMC (DPI), ESD
- I3T50 technology
- Junction temperature: -40°C to 150°C
This automotive ASIC contains a dual H-bridge driver for climate control applications. The driver controls the permanent magnet DC motor of the air-conditioning fan speed in a car.
The IC can be used for pulse count and potentiometer feedback systems with permanent magnet DC motors. In pulse count applications, the IC detects the DC motor commutation pulses and creates a pulse for every detected commutation pulse. These pulses can then be fed back to a microcontroller for position sensing and control.
- 2 H-bridge drivers with over-current detection and protection
- Mode selection circuit for the half-bridges in parallel versus sequential mode
- Pulse detection circuit, one per H-bridge with programmable threshold levels
- Power on reset (POR) and over-voltage shutdown circuitry
- Thermal shutdown circuitry
- Low quiescent current state
- Junction temperature: -40°C to 150°C
- 0.7um CMOS 100V technology
The ASIC contains the automotive interface to a monolithically integrated mass airflow sensor. It interfaces between the LV (Low Voltage) core circuitry, an NTC resistor for temperature sensing, discrete components and optional auxiliary sensor components.
The interface ASIC forms the physical layer for the SENT, PSI5 and PWM protocol.
- Frequency (PWM), PSI5 or SENT output
- HV (50V) interface module, 6 voltage regulators and low-TC oscillator
- Miswiring protection
- ESD +4kV HBM
- Compliance with emission and immunity tests (ISO7673 / IEC CISPR 25 / ISO11452)
- Temperature ranges: -40°C – 125°C (extended range upto 150°C)
- 0.18um CMOS BCD