UCS1002-2 datasheet(64/114 Pages) MICROCHIP

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Programmable USB Port Power Controller with Charger Emulation

Datasheet

Revision 1.4 (07-16-13)

SMSC UCS1002

DATASHEET

9.9

Current Limit Mode Associations

The UCS1002 will close the port power switch and use the current limiting mode as shown in Table 9.2.

As noted in the last three rows in Table 9.2, under those specific conditions with ILIM < 1.5 A, it is the

relationship of ILIM and IBUS_R2MIN that determines the current limiting mode. In these cases, the value

of IBUS_R2MIN is determined by CS_R2_IMIN[2:0] bits 4-2 in the Custom Current Limiting Behavior

Configuration register 51h.

9.10

No Handshake

In DCE Cycle mode with emulation retry disabled, a “no handshake” condition is flagged (the NO_HS

status bit stays set (see Section 10.3.4, "Profile Status 1 - 12h")) when the end of the DCE Cycle is

reached without a handshake and without drawing current.

All signatures / handshaking placed on the DPOUT and DMOUT pins are removed. The UCS1002 will

operate with the high-speed switch opened or closed as determined by the high-speed switch

configuration and will use trip or constant current limiting as determined by the IBUS_R2MIN setting

(CS_R2_IMIN[2:0] bits 4-2 in the Custom Current Limiting Behavior Configuration register 51h).

Table 9.2 Current Limit Mode Options

ACTIVE MODE

CURRENT LIMIT MODE

(SEE Section 10.14)

Data Pass-through

Trip mode

BC1.2 DCP