描述The PGA460 device is a highly-integrated system on-chip ultrasonictransducer driver and signal conditioner with an advanced DSP core. The device has a complimentarylow-side driver pair that can drive a transducer either in a transformer based topology using astep-up transformer or in a direct-drive topology using external high-side FETs. The device canreceive and condition the reflected echo signal for reliable object detection. This feature isaccomplished using an analog front-end (AFE) consisting of a low-noise amplifier followed by aprogrammable time-varying gain stage feeding into an ADC. The digitized signal is processed in theDSP core for both near-field and far-field object detection using time-varying thresholds. The main communication with an external controller is achieved by either a time-commandinterface (TCI) or a one-wire USART asynchronous interface on the IO pin, or a CMOS-level USARTinterface on the RXD and TXD pins. The PGA460 can be put in ultra-lowquiescent current low-power mode to reduce power consumption when not in use and can be woken up bycommands on the communication interfaces.The PGA460 also includes on-chip system diagnostics which monitortransducer voltage during burst, frequency and decay time of transducer to provide informationabout the integrity of the excitation as well as supply-side and transceiver-side diagnostics forovervoltage, undervoltage, overcurrent and short-circuit scenarios.特性Fully Integrated Solution for Ultrasonic Sensing Complimentary Low-Side Drivers With ConfigurableCurrent Limit Supporting Both Transformer Based and Direct Drive Topology for TransducerExcitationSingle Transducer for Both Burst/Listen or a Transducer Pair, Onefor Burst and the Other for Listen OperationLow-Noise Receiver WithProgrammable 6-Point Time-Varying Gain (32 to 90 dB) With DSP (BPF, Demodulation) for Echo EnvelopeDetectionTwo Presets of 12-Point Time-Varying Threshold for ObjectDetectionTimers to Measure Multiple Echo Distance andDuration Integrated Temperature SensorRecord Time for Object Detection up to 11 m128 Bytes of RAM for Echo Recording42 Bytes of User EEPROM to Store Configuration for FastInitializationOne-Wire High-Voltage Time-Command Interfaceor USART Asynchronous Interface CMOS Level USART InterfaceSensor Diagnostics (Decay Frequency and Time, Excitation Voltage), Supply,and Transceiver Diagnostics.All trademarks are the property of their respective owners.