User's Manual

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4 Hardware capabilities
4.1 Introduction to the basic functions of the hardware
The RK3288 board mainly has the following functions:
1. 【
TEST 1
】
LCD
LCD function:J23,J4,J6 connector and LCD screen connection, for LCD The screen
provides a 12V power supply and communicates with it, lights up the LCD screen, and implements
touch function
2. 【TEST 2】Output audio function: output MIC audio signal, connect to the amplifier adapter
board, drive the horn
3. 【TEST 3】Key reset function:SW1 is the reset button, after pressing, the board resets
4. 【TEST 4】USB communication function:USB interface expanded to four USB,J22 is a dual-layer
USB interface, Connect two stereo vision modules,USB3 for external download cables
5. 【TEST 5】Ethernet connection: Ethernet communication function
6. 【TEST 6】RS232 communication function:J11,J13,J14 connectors have RS232 Communication
lines
7. 【TEST 7】Serial communication:J12 connector, communication with lidar
8. 【TEST 8】WiFi communication function; communication with WIFI module
4.2 Power supply circuit
Refer to the power architecture diagram:
1. The input 12V voltage of the RK3288 board is provided by the J11
connector;
2. 12V generates VCC_SYS(5V) through DCDC
3. 12V generates VCC_USB(5V) through DCDC
4. 12V generates +5V through DCDC;
5. VCC_SYS(5V) generates a variety of power supplies through the PMU chip;
6. VCC_SYS(5V) generates VDD_CPU by programmable DCDC;
7. VCC_SYS(5V) generates VDD_GPU by programmable DCDC
8. VCC_IO(3.3V) is generated by the LDO VCC_Flash(1.8V).
4.2.1 DCDC:12V to 5V
12V to 5V with THE MP1471's built-in MOS buck DCDC
There are three MP14 71 12V to 5V circuits on bo ard
1. VCC_SYS (5V)
(1) The main on-board 5V supply is supplied to the PMU chip to generate a variety of
different voltage value supplies