UCS1002-2 datasheet(61/114 Pages) MICROCHIP

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Programmable USB Port Power Controller with Charger Emulation

Datasheet

SMSC UCS1002

Revision 1.4 (07-16-13)

DATASHEET

APPLICATION NOTE: When the M1, M2, and EM_EN controls are set to ‘0’, ‘1’, ‘0’ or to ‘1’, ‘1’, ‘0’ respectively,

Data Pass-through mode will persist if the PWR_EN control is disabled; however, the

UCS1002 will draw more current. To leave Data Pass-through mode, the PWR_EN control

must be enabled before the M1, M2, and EM_EN controls are changed to the desired mode.

9.5

BC1.2 SDP (No Charger Emulation)

When commanded to BC1.2 SDP mode, UCS1002 will discharge VBUS, close its USB high-speed

data switch to allow USB communications between a portable device and host controller, and will

operate using trip current limiting. No charger emulation profiles are applied in this mode. BC1.2 SDP

mode will persist until commanded otherwise by the M1, M2, EM_EN, and PWR_EN controls.

APPLICATION NOTE: If it is desired that the BC1.2 SDP mode operates as a traditional / standard port power

switch, the S0 control should be set to ‘0’.

9.6

BC1.2 CDP

When BC1.2 CDP is selected as the Active mode, UCS1002 will discharge VBUS, close its USB high-

speed data switch (by default), and apply the BC1.2 CDP charger emulation profile which performs

handshaking per the specification. The combination of the UCS1002 CDP handshake along with a

standard USB host comprises a charging downstream port.In BC1.2 CDP mode, there is no emulation

timeout.

If the handshake is successful, the UCS1002 will operate using constant current limiting (variable

slope). If the handshake is not successful, the UCS1002 will leave the applied CDP profile in place,

leave the high-speed switch closed, enable constant current limiting, and persist in this condition until

commanded otherwise by the M1, M2, EM_EN, and PWR_EN controls.

The UCS1002 will respond per the BC1.2 specification to portable device initiated charger

renegotiation requests.

APPLICATION NOTE: BC1.2 compliance testing may require the S0 control to be set to ‘0’ (Attach and Removal

Detection feature disabled) while testing is in progress.

APPLICATION NOTE: When the UCS1002 is in BC1.2 CDP mode and the Attach and Removal Detection feature

is enabled, if a power thief, such as a USB light or fan, attaches but does not assert DP, a

Removal event will not occur when the portable device is removed. However, if a standard

USB device is subsequently attached, Removal Detection will again be fully functional. As

well, if PWR_EN is cycled or M1, M2, and / or EM_EN change state, a Removal event will

occur and Attach Detection will be reactivated.

9.6.1

BC1.2 CDP Charger Emulation Profile

The BC1.2 CDP charger emulation profile acts as described below.

APPLICATION NOTE: All CDP handshaking is performed with the high-speed switch closed.

1. VBUS voltage is applied.

2. Primary Detection - When the portable device drives a voltage between 0.4 V and 0.8 V onto the

DPOUT pin, the UCS1002 will drive 0.6 V onto the DMOUT pin within 20 ms.

3. When the portable device drives the DPOUT pin back to ‘0’, the UCS1002 will then drive the

DMOUT pin back to ‘0’ within 20 ms.

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