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When reading the Platinum Resistance Thermometer Manual, I was faced with this unknown IC (see pp. 38 from the manual):

Schematic

I searched the web with the following keywords: SON044 and 1020B-44, but didn't get any meaningful results back.

I think it should be a kind of FPGA.

What is it? Would anyone please introduce it to me?

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  • \$\begingroup\$ I don't think it's an FPGA, possibly a CPLD or PLD. They've given it a name that includes a contraction of their company name, so I would assume it contains custom programming for this product. \$\endgroup\$ May 28, 2014 at 20:30

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The last line ("1020B-44") suggests that this is an Actel ACT 1 nonvolatile FPGA (A1020B) in a PLCC-44 package. A number of the pin assignments match up perfectly, and the manual that you've got mentions the FPGA in a few places.

Here's the datasheet: http://www.actel.com/documents/ACT1_DS.pdf

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