PGA460 Texas instruments

PGA460

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PGA460

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Описание

The PGA460 device is a highly-integrated system on-chip ultrasonic transducer driver and signal conditioner with an advanced DSP core. The device has a complimentary low-side driver pair that can drive a transducer either in a transformer based topology using a step-up transformer or in a direct-drive topology using external high-side FETs. The device can receive and condition the reflected echo signal for reliable object detection. This feature is accomplished using an analog front-end (AFE) consisting of a low-noise amplifier followed by a programmable time-varying gain stage feeding into an ADC. The digitized signal is processed in the DSP 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-command interface (TCI) or a one-wire USART asynchronous interface on the IO pin, or a CMOS-level USART interface on the RXD and TXD pins. The PGA460 can be put in ultra-low quiescent current low-power mode to reduce power consumption when not in use and can be woken up by commands on the communication interfaces.The PGA460 also includes on-chip system diagnostics which monitor transducer voltage during burst, frequency and decay time of transducer to provide information about the integrity of the excitation as well as supply-side and transceiver-side diagnostics for overvoltage, undervoltage, overcurrent and short-circuit scenarios.

Fully integrated solution for ultrasonic sensing
Complimentary low-side drivers with configurable current limit supporting both transformer based and direct drive topology for transducer excitation
Single transducer for both burst/listen or a transducer pair, one for burst and the other for listen operation
Low-noise receiver with programmable 6-point time-varying gain (32 to 90 dB) with DSP (BPF, demodulation) for echo envelope detection
Two presets of 12-point time-varying threshold for object detection
Timers to measure multiple echo distance and duration
Integrated temperature sensor
Record time for object detection up to 11 m
128 bytes of RAM for echo recording
42 bytes of user EEPROM to store configuration for fast initialization
One-wire high-voltage time-command interface or USART asynchronous interface
CMOS level USART interface
Sensor diagnostics (decay frequency and time, excitation voltage), supply, and transceiver diagnostics

Type	Integrated
Features	Transformer drive
Gain (min) (dB)	32
Gain (max) (dB)	90
Number of input channels	1
Supply voltage (min) (V)	6
Supply voltage (max) (V)	28
Operating temperature range (°C)	-40 to 105
Interface type	OWU (one-wire UART), TCI (time-command interface), UART, USART
Rating	Automotive