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An ASIC would be 100 to 1000 times better on battery current than an FPGA. They are either unsure of design (FPGA can be updated by user) or don't expect to sell many. The ASIC is about 1/10th the cost but maybe 2,000x or more the once off setup cost.
FPGAs are used for prototypes and low volume niche products, or products where the functionality needs updated later.
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