This is one way to do it.

#!/usr/local/bin/perl5.6.0 -w
use strict; 

use Data::Dumper;

my @records;

while ( my $entry = <DATA> )
{
    my %rec = map { /(\S+)\s*=\s*([^\n\r]+)$/ } 
              split( /,/, $entry );

    push( @records, \%rec );
}

print Dumper( \@records );


__DATA__
Field1= a value,Field2= another value, Field3= yet another value
Field1= a value,Field2= another value, Field3= yet another value
Field1= a value,Field2= another value, Field3= yet another value
[download]

Best Regards,
Wonko