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(1) The power supply module TMS320F2812 core voltage of 1.8 V, the external I / O voltage of 3.3 V. The internal FLASH has low voltage programming function. Laptop battery, but requires a separate 3.3 V power supply and quality. Chip power-on timing requirements. So using the the TI power chip TPS676D318. He is a dual-channel single-input output voltage converter. The input voltage of 5 V, the output of 1.8 V and 3.3 V, respectively. The same time the MOS transistor BSS138 control voltage conversion timing. DSP-FLASH and external I / O first power-on, then the kernel, When all voltage reaches a stable value, the delay time of 140 ~ 300 ms. (2) the system startup mode The TMS320F2812 There are six kinds of start-up mode, that is to start the program from different storage space. Laptop battery so that you can meet the different requirements of the control system. Six kinds of control were FLASH, SPI, SCI, HO, OTP and Parallel. These start-up mode can be determined through a combination of the four control pins of the DSP SPICLK, SPISTEA, SCITXDA, MDXA using one control mode. Is given as shown in Table 1, the corresponding combinations of the different boot.? The C language program is easy to program modular package, the structure of the program is clearer, is conducive to the maintenance and worry. The system uses from the the internal FLASH start, so Table 1 combination. (3) signal processing TMS320F2812 has 56 programmable, multi-purpose general-purpose I / O Has a wealth of resources, but they drive voltage up to 3.3 V. External control circuit of the control system of the input signal to 5 V, the output drive signal is 12 V, the need for signal level conversion, pay attention to the isolation of the signal at the same time, improve the anti-jamming capability. The control system used in the A / D converter module of the DSP. The functional unit of the A / D and high precision, fast conversion speed. But more sensitive to noise interference. Laptop accu Acer laptop accu Apple laptop accu Asus laptop accu
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