Texas Instruments PGA450Q1EVM, User Manual

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Read This First
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2 SLDU007C – March 2012 – Revised November 2015
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Copyright © 2012–2015, Texas Instruments Incorporated
PGA450Q1EVM User’s Guide
8 OTP Memory can be programmed while programming the Development RAM
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9 Echo Data Stored in FIFO RAM Plotted in Excel
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10 LIN Master on GUI
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11 DEVRAM Target Options
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12 OTP Target Options
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13 DEVRAM STARTUP.A51 Example
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14 OTP STARTUP.A51 Example
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15 Evaluation Tab Setting
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16 Echo Analog Waveform Output (Channel1), Drive voltage (Channel 2)
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17 DAC Output of Filtered Signal (Channel 2) and Drive Voltage (Channel 1)
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18 Schematic, LIN
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19 Schematic, Power
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20 Schematic, RS232
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21 Schematic, USB Controller
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22 Schematic, PGA450-Q1 (TPIC8500-Q1)
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23 PCB Layout, Bottom
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24 PCB Layout, Top
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List of Tables
1 Jumpers
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2 Default Jumper Settings
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3 Default 0- Ω Resistor Setting
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4 Transducer and Transformer Manufacturer Part Numbers
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Trademarks
1 Read This First
The PGA450-Q1 is an interface device for ultrasonic transducers used in automotive parking assistance
and blind spot detection applications. The device functions as the driver and receiver for a wide range of
transducers with frequency ranges from 40 kHz to 70 kHz. The PGA450-Q1 device incorporates an
analog front end (AFE) and a 8051W microprocessor core. The AFE includes voltage regulators, an
amplifier, an ADC, an oscillator, and a temperature sensor. The PGA450-Q1 device also implements a
LIN 2.1 physical layer for communication. For more details, see the device data sheet.
2 EVM Overview
The features of this EVM are as follows:
• Single power-supply input for basic operation
• Example push-pull transformer and 58-kHz transducer
• LIN master transceiver
• RS-232 transceiver for UART testing and debug
• PC control with a graphical user interface and USB communications board
For a given PGA450Q1EVM installation, the following items apply:
• The PGA450Q1EVM can have either a through-hole or surface-mount transformer installed on it.
When a through-hole transformer is installed, ensure that the case corners are not touching the
surface mount pads.
• The PGA450Q1EVM can be used to drive either a single-ended or push-pull transformer. The selection
of the drive method is achieved through jumper selection.
• The USB communication board 5-V power supply must be enabled for LIN communication to work.
The 5-V power supply provides power to the LIN master transceiver installed on the board.
• In order to communicate with the PGA450-Q1 device using SPI, the 8051W inside the device must be