Allegro MicroSystems A17803 High-Speed Interface ICs
Allegro MicroSystems A17803 High-Speed Interface Integrated Circuits (ICs) are high-speed inductive position-sensor interface ICs designed to measure the rotational angle of metallic targets accurately. The ICs deliver position data through digital communication interfaces. Optimized for demanding automotive and industrial applications such as traction motors, electric power steering (EPS) motors, and transmission actuators, the devices combine a transmitting-coil driver, dual receiving inputs, advanced signal demodulation, and digital processing. The A17803 devices support up to 16-bit resolution at rotational speeds of up to 250,000 rpm, enabling precise and responsive motor position sensing in high-speed environments.
The A17803 incorporates sophisticated compensation and signal-conditioning algorithms, including offset correction, gain adjustment, harmonic compensation, and speed-based angle prediction to reduce sensing latency. These Allegro MicroSystems ICs offer a broad range of output interfaces, including SPI, SENT, motorSENT, PWM, and ABI, giving designers flexibility across different system architectures. In addition, the devices are AEC-Q100 Grade 0 qualified and developed as ASIL C(D) Safety Elements out of Context (SEooC) when used in accordance with the safety manual. These ICs are well-suited for safety-critical automotive applications that require robust, high-precision position sensing.
Features
- Highly integrated inductive position sensor interface ICs optimized for use in e-motor applications
- State-of-the-art signal conditioning algorithms ensure high accuracy over a wide range of system configurations
- Up to 16-bit resolution at up to 250K rpm for traction motor and motor position sensing applications
- Large output interface selection (SPI, SENT, motorSENT, PWM, and ABI)
- Surface mount 14-pin TSSOP (single die) package
- AEC-Q100 grade 0 qualified
- ISO 26262, ASIL-compliant
- Lead-free
Applications
- Transmission actuators
- Traction motors
- EPS electrical motors
- Other high-speed applications
Specifications
- 4.5V to 5.5V supply voltage (VCC) range
- Maximum supply current
- 23mA for A17803-M
- 20mA for A17803-S
- 0.047mA to 14.95mA transmitting coil tail current range
- Undervoltage flag threshold range
- 4V to 4.4V VCC rising
- 3.9V to 4.3V VCC falling
- 75mV to 150mV undervoltage/overvoltage detection hysteresis range
- Overvoltage flag threshold range
- 5.5V to 5.9V VCC rising
- 5.4V to 5.8V VCC falling
- 5ms maximum power-on time
- Transmitting coil driving
- 3MHz to 4MHz coil driving frequency range
- 1µH to 8µH transmitting coil inductance range
- 189Ω to 13,069V equivalent parallel resistance range
- 4.16kHz maximum rotational electrical frequency
- ±10mV allowed direct coupling amplitude
- Angle
- 16-bits via SPI
- 0µs typical response time
- 1µs typical refresh rate
- ±0.25° angle error
- 0.15° maximum lifetime start-up error drift
- 0.006° typical angle noise
- Noise-free 13-bit on angle
- General SPI
- 100kΩ minimum load resistance
- 20pF maximum load capacitance
- SPI interface timing
- 32-bit SPI message length
- 0.1MHz to 5MHz SPI clock frequency range
- 40% to 60% SPI clock duty cycle range
- 3kHz to 140kHz SPI frame rate range
- Digital output
- 0.35V to 4.3V saturation voltage range
- 1.2kΩ to 55kΩ output load resistance range
- 4.5V to 5.4V pull-up source voltage range
- 20µA maximum leakage current
- Maximum operational current
- 20mA sink
- 1mA source
- Short-circuit current limiter range
- 15mA to 30mA sink
- 10mA to 25mA source
- PWM interface
- Carrier frequency
- 125Hz to 6kHz typical setting range
- 16-step programmable options
- 2% to 8% low clamp output range
- 92% to 98% high clamp output range
- 1% typical output clamp step size
- Carrier frequency
- 82°C/W thermal resistance based on JEDEC standard JESD51-7
- -40°C to +160°C ambient operating temperature range
- +175°C maximum junction temperature
Functional Block Diagram
