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InterChip USB , sometimes referred to as USB-IC or Inter-chip USB, is an addendum to the USB Implementers Forum USB 2.0 specification. IC-USB is intended as a low-power variant of the standard physical USB interface, intended for direct chip-to-chip communications. The IC-USB bus's maximum length of 10 cm results in a lower inductance and capacitance and therefore allows lower power requirements. IC-USB is used primarily in embedded systems; for example, ETSI has standardized on IC-USB as the official high-speed interface for connections between the main chipset of a smartphone and the SIM card or UICC card.
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