Forlinx SBC OK1052-C, Руководство пользователя

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EEPROM 1 24C02 chip, 256byte
TF card 1 Compatible with SD, SDHC
LED 1 for user's definition to LED
POR_BUTTON 1 Reset key
ON/ OFF 1 Power key, press it to turn on or off
BOOT 1
DIP switch for booting mode selection, presently, it can only support
internal TF, QSPI NOR and QSPI NAND booting modes
PWM 1 For LCD backlight controlling
ADC 5
4-ch for resistive touching panel, 1-ch for adjustable resistor
(multiplexed with TX of CAN, P25 jumper cap jumps to left(2, 3) to
choose ADC adjustable resistor
IIC 1
Mounting with LCD, camera, WM8960, EEPROM, RTC, IIC to 4-ch
touching, IIC addresses not conflict, and could be used at the same time
CAN 1
CAN 2.0B, DG128-2P header, multiplexed with ADC adjustable
resistor, set P25 jumper cap to right side (1, 2) to choose CAN_TX
SPI 1
2.0mm pitch, 10P header, multiplexed with TF card, please remove TF
card when using SPI
UART 1 3-wire UART, 3.3V, each up to 5.0Mbps, 2.54mm 10P header
IIS 1 For WM8960
UART Debug 1 RS232, DB9 connector
SWD 1 Debug port, 2.54mm pitch, 8P header
Resistive touch 1
The carrier board is compatible with native touching and TSC2007 chip,
it will use TSC2007 by default, the touching chip is multiplexed with
4-wire ADC, users should use it by R106, R107, R108, R109 with 0
Ω
Key board 1 4* 4 keypad, multiplexed with camera, 2.54mm pitch, 8P header
3.4 OK1052-C Carrier Board Introduction
Components marked with _DNP means the components are not soldered
3.4.1 Carrier Board Power
Carrier board is designed with power input by 5V power input via P411, the power will go through
self-healing fuse and anti-reverse polarity diode and over-voltage circuit(3 1K parallel resistor R81,
R82, R83 are used for current distribution, and heat radiating), and then through LM117 to reduce
5V to 3.3V, V_CORE5V supplies power to SoM, VCC5V supplies power to carrier board,
V_CORE5V supplies power to SoM, once SoM booted, it will output R7_ON_PEQ high level
signal, field-effect tube Q6 will breakover, V_CORE5V connected with VCC5V power, U7 and Q6
to assure supplies power to SoM firstly, and then carrier board, to avoid CPU failure caused by
latch-up.