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A “cordless mouse controller” chip.

Package

(Logo)
EM84P100P
0322W BP35V2

Die

*M*
ELAN
EJ5610
(Mask IDs)
EJ5610A

Die size: 1.49×2.12 mm.

siliconprawn.org_map_elan_em84p100p_single_elan_em84p100p_infosecdj_mz_nikpa60x.thumb.jpg

Top metal imaged using Nikon Plan Apo 60x/1.40 oil