The car camera reference design provides a complete solution for 76GHz to 81GHz radar sensor modules. The onboard power supply converts the car battery input into radar simulation front end (AFE), processor, and voltage track required for controller local area network (CAN-FD) transceiver with elastic data transmission rate. After treatment, the target data is transmitted via the included CAN-FD physical layer (PHY).
characteristic
The design is spatial optimization, which can be installed on a single PCB (about 50mm × 71mm)
The power is optimized, reduced size, and improves efficiency.
Single-chip 76GHz to 81GHz car radar sensor integrates DSP and MCU, providing target data via CAN-FD
Wide input voltage range, 36V battery external supply voltage, up to 42V voltage
Diagnostic and monitoring function applications for ASIL B
application:
ADAS radar system
Blind Point Monitoring System (BSD)
Lane Transform Assist System (LCA)
Front / back side to the car warning system (F / RCTA)
Independent emergency brake (AEB)
Adaptive Cruise Control (ACC)
In the above design, the mainly involved circuitry is AWR1642, LP87702-Q1, TPS7A52-Q1, LM53625-Q1, Tcan1042GV-Q1.
The AWR1642 is an integrated DSP and MCU 76GHz to 81GHz single-chip automotive radar sensor, AWR1642 device is an automotive radar sensor in which the FMCW radar sensor single-chip solution can simplify the 76 to 81 GHz band.
Its built-in FMCW transceiver integrates numerous features:
Integrated PLL, transmitter, receiver, baseband and A2D
76 to 81GHz coverage, with 4GHz available bandwidth
Four receiving channels
Two send channels
Frequent linear frequency frequency pulse (timing) engine based on fractional N PLL
TX power: 12.5dBm
RX noise coefficient:
14dB (76 to 77GHz)
15dB (77 to 81GHz)
Phase noise at 1 MHz:
-95DBC / Hz (76 to 77GHz)
-93DBC / Hz (77 to 81GHz)
LP87702-Q1 meets the latest platforms, especially automotive radar and camera, and power management requirements in industrial radar applications. The device contains two buck DC / DC converters, a 5V boost converter / bypass switch, two voltage monitoring inputs for external power supplies, and window watchdogs. The device is controlled by the I2C compatible serial interface and enable signals.
Automatic PWM / PFM (AUTO mode) runs higher efficiency within a wide output current range of the buck converter. The LP87702-Q1 uses the remote voltage detection function of the buck converter to compensate for the IR voltage drop between the converter output and the load point, thereby increasing the accuracy of the output voltage. In addition, the switch clock can be forced to enter the PWM mode and synchronize it with an external clock to minimize interference.
The LP8770 device has an internal circuit specifically designed to support current detection, so there is no need to use an external resistor. Programmable startup and shutdown sort can support synchronization to enable signals, with universal digital output. During startup and voltage changes, the device is controlled to the output roseway, thereby minimizing the output voltage overshoot and surge current.
TPS7A52-Q1 set low noise (4.4μVRMS), high PSRR and high output current capabilities, etc., which is ideal for supplying noise sensitive components in applications such as radar power and info entertainment. The excellent performance of this device can suppress phase noise and clock jitter generated by the power supply, so it is ideal for supplying power of RF amplifiers, radar sensors, and chipset. Radio frequency amplifiers are particularly benefited from high performance and 5.0V output capabilities of the device.
For digital loads that need to be operated with low input voltage and low output (LILO) voltage (such as dedicated integrated circuit (ASIC), field programmable gate array (FPGA), and digital signal processors (DSP)), TPS7A52-Q1 Extreme precision (up to 1% in the load and temperature range), remote sensing, excellent transient performance and soft start capability ensure excellent system performance.
This CAN transceiver series meets ISO1189-2 (2016) high-speed CAN (controller local network) physical layer standard. All devices are designed for CAN FD networks with up to 2Mbps (giga per second). The component number contains the "G" suffix device designs the CAN FD network with a data rate up to 5Mbps, and the part number contains the "V" suffix device with a secondary power input for I / O level conversion (for setting input pins) Thresholds and RXD output levels). This series has low power standby mode and remote wake-up request characteristics. In addition, all devices contain many protection functions to increase the stability of devices and CAN.
Overall, this is a 77GHz radar module reference design with target data output.
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