The TMS320F28335 digital signal processor is a TMS320C28X series DSP floating point TI controller. Compared with the previous fixed-point DSP, the product has the advantages of high precision, low cost, low power consumption, high performance, high peripheral integration, large data and program storage, and more accurate and fast A/D conversion. High speed processing ability of TMS320F28335 with 150MHz, with a 32 bit floating-point processing unit, 6 DMA ADC, McBSP and EMIF channel support, with up to 18 PWM output, which has 6 way to output PWM high precision characteristic of TI (HRPWM), 12 ADC 16 channel. Thanks to floating-point arithmetic units, users can quickly write control algorithms without consuming too much time and effort in dealing with decimal operations, thus simplifying software development and reducing development time and cost.
28335 super board in addition to assessing the chip itself memory, communications, PWM output, CAP capture function, but also added external expansion function:
2 . add the conditioning circuit
4. Add the calendar clock
6, the grounding wire and the signal line have made anti-interference treatment, effectively solved the interference problem in the strong electromagnetic interference environment, and can directly develop the system in the industrial environment.
1. uses 32 bit floating point DSP TMS320F28335, clock frequency 150MHz, clock cycle 6.67ns;
2. low power design, core voltage 1.9V, I/O port voltage 3.3V;
3. rich storage design
In film: RAM, 34K * 16, Flash, 256K * 16 bits;
External expansion: RAM, 256K * 16 bits, Flash, 512K * 16 bits;
4. chip on chip integrated peripheral
18 way PWM (6 of which is HRPWM); 16 channels; 12 bit ADC; 80ns fast conversion; 0 to 3V range; 2 channel QEP; 6 channel CAP; 3 channel SCI; 2 channel CAN; 2 channel McBSP; 1 channel SPI; 1 channel I2C;
5. . the high performance ADC chip AD7656 is used to expand the 6 way 16 bit ADC. The sampling precision is high, the high-speed synchronous sampling, the analog sampling dynamic range -10V~+10V;
6., using DAC7724 outside the expansion of the 4 road, 12 bit DAC output, can be programmed to achieve arbitrary waveform output;
7. external expansion 100M/10M Ethernet port, the hardware supports TCP/IP protocol, and can realize the Internet access with Internet:
W5100 is a versatile monolithic network interface chip with an internal 10/100 Ethernet controller. It is mainly used in embedded systems with high integration, high stability, high performance and low cost. Using W5100, you can implement Internet connections without operating systems. W5100 is compatible with IEEE802.3, 10BASE-T, and 802.3u 100BASE-TX. W5100 has a full hardware, TCP/IP protocol stack, Ethernet medium transport layer (MAC) and physical layer (PHY), which have been verified for many years. The hardware TCP/IP protocol stack supports TCP, UDP, IPv4, ICMP, ARP, IGMP, and PPPoE. These protocols have been validated in many fields for years. W5100 is also internally integrated with 16KB memory for data transmission.
The use of W5100 does not require Ethernet control, and only simple port (Socket) programming is required. W5100 provides 3 types of interfaces: direct parallel bus, indirect parallel bus and SPI bus. W5100 and MCU interfaces are very simple, just like accessing external memory.
Super management board using the W5100 chip Ethernet, DSP uses parallel interface and communication, it can easily realize the Ethernet communication. 100MHZ can be directly connected to the Ethernet super board, can work in the server, client, or WEB SERVER or UPD datagram transceiver directly. The test program provides the driver module of TCP/IP client and server, and also provides UPD datagram sending and receiving test module, which can realize the Ethernet communication in these three ways.
8.12 - way PWM signal output, each circuit has plastic and regeneration circuit;
The 9.4 path captures the CAP signal input and each circuit has a reshaping and regeneration circuit;
10.2 channel quadrature encoder eQEP input channel, each circuit has plastic and regeneration circuit;
11.1 motor control drive interface, 1 motor fault signal input interface, used for motor drive control;
12.1 SPI synchronous serial ports, 1 RS232 communication interfaces, 1 RS485 communication interfaces with optocoupler isolation, 1 CAN communication interfaces, and data communication in a variety of ways;
13., external expansion 6 road, 5V level, digital output DO, can be used directly to drive relays;
14. with LCD interface and keyboard control interface, and with REN-LCD&KEY expansion board, LCD display and keyboard control can be achieved;
15., with RTC real-time clock function, can record events;
16. provide power monitoring, power on reset, manual reset, reliable and stable.
1. consists of the F28335 core board and the F28335 function backplane B. The core board is designed with 6 layers of PCB, and the bottom board B is designed with 4 layers of PCB. The performance of the core board is stable and reliable, and the capability of the product EMC (electromagnetic interference resistance) is fully taken into consideration, and the design layout is reasonable, and can be directly applied to industrial measurement and control.
2., fully considered the protection of CPU, the address line, data line, control line and I/O port adopt level conversion circuit to convert 3.3V level to 5V. There are three advantages in doing so:
(1) play a role in protecting CPU and reducing the load of CPU;
(2) the driving ability of the client signal is improved;
(3) reduce the interference of client signals to CPU;
3.PWM, CAP and QEP signals have been designed with pulse shaping and regeneration circuits. There are two advantages to this:
(1) the pulse rising absolute steep, small delay;
(2) the jitter of pulse is reduced and the precision of detection is improved;
4.AD collects all channels and adds signal preprocessing circuit, which effectively improves the accuracy of AD acquisition;
5., outside the expansion of the 6 road, 16 bit ADC, 4 road, 12 bit DAC, to meet your more development requirements;
6., the 100M/10M Ethernet port is expanded, and the network interconnection of the development board can be realized.