DSP core:
TMS320F2812,
which is chosen in this device,
is a high performance, rich resources and costeffective 32-bit fixed point DSP.
The key of this DSP is that its I/O interface voltage is 3.3V,
which is conformed to the ARM chip’s.
Switch port can be directly connected to the DSP chip through the photoelectric isolation,
thus the parallel I/O interface chip is not necessary and the reliability of binary inputs/outputs is improved in the protection device