Dsp28335 development board Chinese data summary (dsp28335 minimum system _ pin diagram _ package

Dsp28335 development board minimum application system design

Using TMS320F28335 to form an application system, first consider whether the various functions of the TMS320F28335 meet the application system requirements. If satisfied, the system is the smallest application system. A minimum application system includes: reset circuit, clock circuit, power supply, and memory. For TMS320F28335, it has on-chip Flash, OTPROM and SARAM memory do not need to consider the external memory interface problem when designing the minimum application system.

The following is a connection method of F28335 minimum application system:

Dsp28335 development board Chinese data summary (dsp28335 minimum system _ pin diagram _ package _ initialization program)

1. Reset circuit design

First introduce the MAX811 chip, MAX811 chip to ensure the normal reset of the DSP chip.

VCC: Power

GND: DC ground

/ RST: Automatic reset (power-on reset), active low. It is valid when the VCC voltage is below the reset threshold and remains low for at least 140ms after the VCC voltage rises above the reset threshold.

/MR: Manual reset terminal, active low. It is valid as long as /MR is low, and the state of the reset pin will be held until 140ms after /MR returns high.

From the above explanation, it is well understood how the above reset circuit works.

2. Clock circuit design

3. Power circuit design

Here is the TPS767D301 power chip two power output for the DSP chip and peripheral equipment. The system core voltage is 1.9V and the I/O port supply voltage is 3.3V.

4. JTAG interface circuit

The TMS320F28335 has an on-chip scanning emulation interface (JTAG) conforming to the IEEE1149.1 standard, which is accessed directly by the emulator. In order to communicate with the emulator, the designed minimum system board should have a 14-pin emulation interface. The EMU0 and EMU1 signals must be connected to the power supply through pull-up resistors. The pullup resistor is 4.7kÎ©.

summary:

The design circuit of the minimum application system of the TMS320F28335 is given above. The circuit is used to simulate and develop the TMS320F28335 system in real time online. However, this system is only a minimum application system. The application system of a specific module should be designed according to actual needs.

Precautions:

(1) The clock circuit adopts the internal crystal oscillator, and should be placed as close as possible to the TMS320F28335 in the circuit configuration. The lead should be short and thick, the capacitor should be stable, and the capacitance value should be accurate. It should be far away from the heating element.

(2) Use a protective capacitor at the output end of the power module. The value must not be less than 10Î¼F. Chip capacitors or high-frequency ceramic capacitors cannot be used. Otherwise, the operation is unstable.

Here is the TPS767D301 power chip two power output for the DSP chip and peripheral equipment. The system core voltage is 1.9V and the I/O port supply voltage is 3.3V.

Dsp28335 package