TI公司的TDC1000是全集成的模拟前端(AFE),用来测量汽车,工业和消费类电子的水位,液体浓度,流量和接近距离,和TI的MSP430/C2000 MCU一起使用,提供完整的超声波检测解决方案.本文介绍了TDC1000主要特性,功能框图和几种应用电路,以及汽车超声波液体流量测量参考设计TIDA-00322主要特性,电路图和材料清单.

The TDC1000 is a fully integrated analog front-end (AFE) for ultrasonic sensing measurements of level, fluid identification/concentration, flow, and proximity/ distance applications common in automotive, industrial, medical, and consumer markets. When paired with an MSP430/C2000 MCU, power, wireless, and source code, TI provides the complete ultrasonic sensing solution.

TI’s Ultrasonic AFE offers programmability and flexibility to accommodate a wide-range of applications and end equipment. The TDC1000 can be configured for multiple transmit pulses and frequencies, gain, and signal thresholds for use with a wide-range of transducer frequencies (31.25kHz to 4MHz) and Q-factors. Similarly, the programmability of the receive path allows ultrasonic waves to be detected over a wider range of distances/tank sizes and through various mediums.

Selecting different modes of operation, the TDC1000 can be optimized for low power consumption, making it ideal for battery powered flow meters, level instrumentation, and distance/proximity measurements. The low noise amplifiers and comparators provide extremely low jitter, enabling picosecond resolution and accuracy for zero and low flow measurements.

TDC1000主要特性:

Automotive AEC-Q100 (TDC1000-Q1)
Measurement Range: Up to 8 ms
Operating Current: 1.8 µA (2 SPS)
Transmitter Channels TX1/TX2:
Supports Single or Dual-Transducer Application
Programmable Excitation: 31.25 kHz to 4 MHz, Up to 31 Pulses
Receiver Channels RX1/RX2:
STOP Cycle-to-Cycle Jitter: 50 ps_RMS
Low-Noise and Programmable Gain Amplifiers
Access to Signal Chain for External Filter Design
Programmable Threshold Comparator for EchoQualification
Automatic Channel Swapping for Differential Time-of-Flight (TOF) Measurement
Programmable Low Power Mode for Long TOF Measurements
Temperature Measurement
Interface to Two PT1000/500 RTDs
RTD-to-RTD Matching Accuracy 0.02℃_RMS
Operating Temperature Range: –40℃ to 125℃
TDC1000应用:
Fluid Level Sensing

图1。TDC1000功能框图

图2。TDC1000水平和浓度测量应用电路图

图3。TDC1000水流量表应用简化框图

汽车超声波液体流量测量参考设计TIDA-00322

TI reference design TIDA-00322 is an automotive liquid level and fluid identification measurement system. It is based on the dual-channel TDC1000-Q1 ultrasonic AFE and the real-time microcontroller C2000. This reference design can also be used with the TDC1000 for industrial/consumer applications. This solution supports 4.5-40V system capabilities with reverse battery protection. 

For prototyping and signal accessibility for product development, TI recommends using the TDC1000-C2000EVM as the hardware evaluation platform for automotive designs. For industrial or consumer designs, it is recommended to begin evaluation with the TDC1000-TDC7200EVM. This EVM has the ability of using the MSP430 or the TDC7200 as the stop-watch timer; usage of each depends on the time of flight accuracy requirement of the application.

液体流量测量参考设计TIDA-00322特性:

Dual Channel Analog-front-end for ultrasonic sensing
High voltage circuit to drive the transducer with 30V to penetrate deeper tanks
Input voltage range of 6V to 40V with reverse battery protection
Automotive qualified Bill of Material
External RTD Measurement  to monitor temperature changes that affect the medium’s speed of sound
CAN transceiver for flexibility of adding future CAN stack

图4。TIDA-00322板外形图

图5。TIDA-00322板电路图(1)

图6。TIDA-00322板电路图(2)

图7。TIDA-00322板电路图(3)

图8。TIDA-00322板电路图(4)

图9。TIDA-00322板电路图(5)
TIDA-00322板材料清单:


详情请见:
http://www、ti、com/product/tdc1000
和http://www.ti.com/lit/ug/tidu617a/tidu617a.pdf
以及http://www.ti.com/lit/df/tidrbi0/tidrbi0.pdf

tdc1000.pdf
tidu617a.pdf
tidrbi0.pdf