New design stm32f103zet6 core board, whole layout is reasonable, simple and generous,
The characteristics are as follows:
-matching chip for new original stm 32f103zet6, 72m main frequency, lqfp 144 package, flash capacity: 512k, sram capacity: 64k, all pins have been drawn, easy to expand.
-a power indicator.
-two user indicator lights.
-standard 20 pin jtag socket, which can connect to the simulators link, link, link, etc.
5.8 m working crystal vibration, official parameters, the chip has pll multiple frequency, the chip maximum frequency 72 m.
6.1 reset keys to provide hardware external reset function.
7.2 user keys to facilitate beginners to do the most basic learning programming.

-an asm 1117-3.3 voltage regulator, which provides 3.3v power supply for the main board, uses capacitance filter to ensure the system's steady operation.
9. both the usb interface and the com-ttl interface are unified using the miniusb interface. the store also has a miniusb interface usb to ttl download line, which can be used for simultaneous power supply, download and serial communication

Both sides of the needle can be up or down, delivery default not welding, distribution of needle, convenient for users according to their own needs welding.
-provide pdf-format schematics and pdf-format pcb maps and protel-format pcb size positioning maps to facilitate floor design
Size 42x72 mm is small enough to fully extend all the pins you need.

Direct usb port to power, no other power supply.
Core board low-cost sales do not provide technical support, the development board default burn led light flashing program, receiving the first time to verify whether the core board is working
Provide serial port program and stream lamp program, provide pdf format schematic pcb diagram.(All of the above information is sent by mail or on-line, not distributed on cd-rom)
This product can not be called learning board, can be called development board or core board, only as developers to improve development speed.
Our shop is thin and multi-sale, before the issuance of only to do appearance, burn-down test, simulation connection testing.Please test the goods in time, test first and weld the plug