UCS1002-2 datasheet(80/114 Pages) MICROCHIP

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Programmable USB Port Power Controller with Charger Emulation

Datasheet

Revision 1.4 (07-16-13)

SMSC UCS1002

DATASHEET

temperature exceeds the TREG value, or emulation is restarted. In the case of the BC1.2 DCP or

Legacy 2 charger emulation profiles, this will be the short (RDCP_RES). In the case of the Legacy

1, or Legacy 3 - 7 profiles, this will be the DPOUT and DMOUT pin voltages. If a portable device

does not draw charging current, the DCE Cycle will behave normally.

Bits 1 - 0 - EM_RESET_TIME[1:0] - Determines the length of the tEM_RESET time (see Section 9.8.1,

"Emulation Reset") as shown in Table 10.8.

Note 10.1 When measured, the actual emulation reset time will be tEM_RESET plus tDISCHARGE.

10.4.3

Switch Configuration - 17h

The contents of this register are retained in Sleep.

Bit 7 - PIN_IGNORE - Ignores the M1, M2, PWR_EN, and EM_EN pin states when determining the

Active mode selection and power state.



‘0’ (default) - The Active mode selection and power state will be set by the OR’d combination of

the M1, M2, PWR_EN, and EM_EN pin states and the corresponding bit states.



‘1’ - The Active mode selection and power state will be set by the individual control bits and not by

the M1, M2, PWR_EN, and EM_EN pin states. These pin states are ignored.

Bit 5 - EM_EN_SET - In conjunction with other controls, determines the Active mode that is selected

(see Section 9.2, "Active Mode Selection") and power state (see Table 5.1, "Power States Control

Settings"). This bit is OR’d with the EM_EN pin.

Bit 4 - M2_SET - In conjunction with other controls, determines the Active mode that is selected (see

Section 9.2) and power state (see Table 5.1). This bit is OR’d with the M2 pin.

Bit 3 - M1_SET - In conjunction with other controls, determines the Active mode that is selected (see

Section 9.2) and power state (see Table 5.1). This bit is OR’d with the M1 pin.

Bit 2 - S0_SET - In SMBus mode, enables the Attach and Removal Detection feature and affects the

power state (see Section 5.3.6, "S0 Input").



‘0’ - Detection is not enabled. Also see Table 5.1, "Power States Control Settings".



‘1’ (default) - Detection is enabled. Also see Table 5.1.

Bit 1 - PWR_EN_SET - Controls whether the port power switch may be turned on or not and affects

the power state (see Section 5.3.4, "PWR_EN Input"). This bit is OR’d with the PWR_EN pin and the

polarity of both are controlled by SEL pin decode. Thus, if the polarity is set to active high, either the

PWR_EN pin or this bit must be ‘1’ to enable the port power switch.

Table 10.8 EM_RESET_TIME Bit Decode

EM_RESET_TIME[1:0]

TEM_RESET TIME (SEE Note 10.1)

50 ms (default)

75 ms

125 ms

175 ms

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