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This question already has an answer here:

circuit inside the calculator

I've taken apart my pocket calculator, and I'd like to know what IC is inside the black blob. Is there an IC commonly used in such applications?

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marked as duplicate by PeterJ, Leon Heller, alexan_e, RedGrittyBrick, Joe Hass Mar 20 '14 at 10:46

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  • \$\begingroup\$ thank you..I didn't know the name of it before... \$\endgroup\$ – Wupadrasta Santosh Mar 20 '14 at 8:09
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This is the main controller part of the circuit. Mainly it is found in LCD Displays. eg ST7920

please check it out enter image description here

enter image description here

enter image description here

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  • \$\begingroup\$ That's an example of the same packaging technology, yes, but a fairly different circuit. The one on the calculator is mostly calculator, with a more trivial segment driver. \$\endgroup\$ – Chris Stratton Mar 20 '14 at 14:12

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