Resolver sensor interface saves space with integration
PCB space is reduced with the PGA411-Q1 resolver to digital converter from Texas Instruments. It is believed to be the industry’s first resolver sensor interface with integrated power supply, exciter amplifier and functional safety features. It can simultaneously excite the resolver sensor coil and calculate the angle and velocity of a rotating motor shaft without the external components required by competitive solutions, says the company. Suitable applications are to increase system accuracy and stability for end equipment like 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.
According to the company, the bill of materials and PCB space is reduced by up to 50%, with the elimination of at least 10 external and passive components. The integrated exciter amplifier, high-voltage boost power supply with short protection, and programmable fault detection thresholds and filters allow the converter to support 4.0 to 7.0Vrms resolver sensors. It can often to eliminate the need for external circuitry, says the company.
The integrated built-in self-test performs an analogue and logic component self-check automatically upon start-up, enhancing latent fault coverage. The self-test and diagnostics enable engineers to develop systems that meet Automotive Safety Integrity Level (ASIL) D functional safety certification for ISO 26262.
Over-voltage, under-voltage and thermal offer protection, including separation of the high-current and high-voltage blocks from other parts of the device, which are susceptible to damage. The analogue front end’s integrated comparators remove the need for an external ADC, which reduces the effects of quantisation noise on the input signals from the sensor.
The converter can be paired with the company’s C2000 F28379 microcontrollers and DesignDRIVE Position Manager technology for functional safety redundancy.
The converter is available in a 64pin thermally enhanced TQFP PowerPad package. An evaluation module is also available.