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Help CenterCH376S Evaluation Board U Disk SD Mouse Support Parallel Serial SPI Interface
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Data download address: /s/1eQ02esi
instructions
The main component of the evaluation board CH376S is the U1 chip, but some of the signal is named after CH375 or CH374.
Crystal 1 for standard 12Mhz, USB host USB device request higher frequency accuracy, 1 error is less than 0.4 per thousand, ordinary 12Mhz crystal basically can meet the requirements. Shorten the length of the lead wire is strongly recommended to reduce interference.
The capacitor C4 is used for the decoupling of the internal power supply node to reduce the EMI in the process of USB transmission, the capacity is 4700pF to 0.1uF, and the common 103 chip capacitor 0.01uF.
P4 is a USB port, either for the USB host host, can also be used for USB device device, resistor, R1, to limit the output current to the eternal USB device, avoid u disk USB devices such as newly inserted caused decreased supply voltage for a short time, or even cause CH376 or single normal reset or internal RAM data error. If it is a USB eternal hard disk, then it should be replaced by a resistor R1 DC resistance of the inductor, or in addition to a group of 5V power supply directly to provide greater operating current (500mA) to the eternal hard drive. In addition, the power decoupling capacitor USB-HOST C9 socket capacity can not be too small, large capacity (should be greater than 100 F) can reduce the power supply voltage fluctuations in the USB device just inserted.
P5 SD card socket, you can contact the standard size of the SD card, other specifications of the SD card can be required to add a conversion seat. For the current limiting resistor R3 output to an eternal SD card, to avoid a short time caused by the power supply voltage in SD Kagan inserted down.
P1 is the 8-bit parallel port signal port, for connecting one of the microcontroller's parallel and parallel the necessary signals including d0-d7, A0, RD#, WR#, CS# and GND rather INT# is optional
P2 is a SPI serial port signal port for connecting the MCU SPI interface, the necessary signal SPI including SCK, SDI, SCS, SDO and GND, and INT# is optional.
P3 is an asynchronous serial port, used to connect the asynchronous serial port, the necessary signal of the asynchronous serial port, including TD, RD and GND, and INT# is optional. P3 at the same time provides an SD card to write protection SDWP and plug SDINSERT signal line.
The P1, P2, P3 port, can also from the outside to the evaluation board with 5V power supply, and provide optional hardware reset signal to CH376 rsti pin, if u p supervisory circuits in the circuit of actual product, you should provide a reset signal CH376 and MCU. Note that you should try to shorten the length of the assessment board between the microcontroller and the signal line, the longest not more than 20cm, otherwise you will need to use a signal between a ground of special cable.
J3 used to select the CH376 chip operating voltage, short pin connected to the 1-2 pin for the 5V voltage, the short pin connected to the 2-3 pin for the 3.3V voltage. The default is 5V voltage, but when the single chip operating voltage is equal to or less than 3.3V, you can choose 3.3V voltage for CH376. When the working voltage of the CH376 chip is 5V, the J2 must be disconnected. When the working voltage of the CH376 chip is 3.3V, the J2 must be short connected.
J1, J5 and J6 are used to select the communication interface between CH376 and single chip microcomputer after power up or hardware reset:
If the J1 is short, J5 off, J6 off, so 8 bit parallel;
If J1 is disconnected, J5 is short, J6 is short, then it is SPI interface;
If J1 is disconnected, J5 is disconnected, J6 is disconnected, then it is an asynchronous serial port.
Some eamples of procedures may be used microcontroller serial output debugging information, if you need to display the monitoring information, the microcontroller serial port RS232 level translation after connected to the computer using serial port monitoring / debugging tool software to view. If use CH375 evaluation board, then the J2 is connected to the serial port of the computer; if the computer is not the serial port or serial port has been occupied other devices, you can by USB to serial chip CH341 provide emulated serial port.
CH375 evaluation board to work within the 5V power supply voltage, you must add a resistor R0 and remove the 3.3V regulator D4, working in the 3.3V supply voltage, you must add the regulator D4 and remove the resistance R0. Default is 5V power.
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