High-integration resolver interface for accurate angle sensing

June 10, 2016 // By Graham Prophet
The PGA411-Q1 resolver-to-digital converter from Texas Instruments is a resolver sensor interface with integrated power supply, exciter amplifier and functional safety features. The new device is capable of simultaneously exciting the resolver sensor coil and calculating the angle and velocity of a rotating motor shaft without the external components required by competitive solutions.


The device’s architecture helps enable designers to increase system accuracy and stability for end equipment such as hybrid electric vehicle/electric vehicle (HEV/EV) traction inverters, electric power steering, integrated start-stop generators, industrial alternating current (AC) servo motor control and robotic arm control.


The PGA411-Q1 offers;

- A high level of integration, saving PCB space by up to 50%; its integrated exciter amplifier, high-voltage boost power supply with short protection, and programmable fault detection thresholds and filters support a wide range of 4-Vrms and 7-Vrms resolver sensors and often eliminate the need for external circuitry.

- Advanced functional safety features: The integrated built-in self-test (BIST) performs an analogue and logic component self-check automatically upon startup, enabling enhanced latent fault coverage. The self-test and built-in diagnostics, TI says, largely eliminate the need for external protection and enable engineers to develop systems that meet Automotive Safety Integrity Level (ASIL) D functional safety certification for International Organization for Standardization (ISO) 26262.

- System stability and accuracy: The device architecture provides overvoltage, undervoltage and thermal protections, including separation of the high-current and high-voltage blocks from other parts of the device, like the analogue front end (AFE), which are highly susceptible to damage. The AFE’s integrated comparators remove the need for an external analogue-to-digital converter, which helps enable stability by reducing the effects of quantization noise on the input signals from the sensor.

- Built-in programmable features such as an internal clock, AFE, and increased diagnostics and protection enable engineers to scale the device to fit a range of resolver sensors and system needs. Designers can easily change internal parameters and move to a new platform design without the extensive engineering effort typically required to redesign hardware or debug a new system.


Developers can pair the PGA411-Q1 resolver-to-digital converter with TI’s C2000 F28379 microcontrollers (MCUs) and DesignDRIVE Position Manager technology for functional safety redundancy. The DesignDRIVE Position Manager technology gives engineers access to the