UCS1002-2 datasheet(66/114 Pages) MICROCHIP

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Programmable USB Port Power Controller with Charger Emulation

Datasheet

Revision 1.4 (07-16-13)

SMSC UCS1002

DATASHEET

9.11.3

Legacy 1, 3, 4, and 6 Charger Emulation Profiles

Legacy 1, 3, 4, and 6 charger emulation profiles follow the same pattern of operation although the

voltage that is applied on the DPOUT and DMOUT pins will vary. They do the following:

1. The UCS1002 will apply a voltage on the DPOUT pin using either a current-limited voltage source

or a voltage divider between VBUS and ground with the center tap on the DPOUT pin.

2. The UCS1002 will apply a possibly different voltage on the DMOUT pin using either a current-

limited voltage source or a voltage divider between VBUS and ground with the center tap on the

DMOUT pin.

3. VBUS voltage is applied.

4. If the portable device draws more than IBUS_CHG current when the tEM_TIMEOUT timer expires, the

UCS1002 will accept that the currently applied profile is the correct charger emulation profile for

the attached portable device.Charging commences. The voltages applied to the DPOUT and

DMOUT pins will remain in place (unless LEAVE_EMU_RESP is set to 0b). The UCS1002 will

begin operating in trip mode or CC mode as determined by the IBUS_R2MIN setting (see Section

10.14, "Current Limiting Behavior Configuration Registers").

5. If the portable device does not draw more than IBUS_CHG current when tEM_TIMEOUT timer expires,

the UCS1002 will stop the currently applied charger emulation profile. This will cause all voltages

put onto the DPOUT and DMOUT pins to be removed. Emulation reset occurs, and the UCS1002

will initiate the next charger emulation profile.

9.11.4

Legacy 5 Charger Emulation Profile

Legacy 5 charger emulation profile does the following:

1. The UCS1002 will apply 900 mV to both the DPOUT and the DMOUT pins.

2. VBUS voltage is applied.

3. If the portable device draws more than IBUS_CHG current when the tEM_TIMEOUT timer expires, the

UCS1002 will accept that the currently applied profile is the correct charger emulation profile for

the attached portable device.Charging commences. The voltages applied to the DPOUT and

DMOUT pins will remain in place (unless LEAVE_EMU_RESP is set to 0b). The UCS1002 will

begin operating in trip mode or CC mode as determined by the IBUS_R2MIN setting (see Section

10.14, "Current Limiting Behavior Configuration Registers").

4. If the portable device does not draw more than IBUS_CHG current when tEM_TIMEOUT timer expires,

the UCS1002 will stop the currently applied charger emulation profile. This will cause all voltages

put onto the DPOUT and DMOUT pins to be removed. Emulation reset occurs, and the UCS1002

will initiate the next charger emulation profile.

9.11.5

Legacy 7 Charger Emulation Profile

The Legacy 7 charger emulation profile does the following:

1. The UCS1002 will apply a voltage on the DPOUT pin using a voltage divider between VBUS and

ground with the center tap on the DPOUT pin.

2. VBUS voltage is applied.

3. If the portable device draws more than IBUS_CHG current when the tEM_TIMEOUT timer expires, the

UCS1002 will accept that Legacy 7 is the correct charger emulation profile for the attached portable

device.Charging commences. The voltage applied to the DPOUT pin will remain in place(unless

LEAVE_EMU_RESP is set to 0b). The UCS1002 will begin operating in trip mode or CC mode as

determined by the IBUS_R2MIN setting (see Section 10.14, "Current Limiting Behavior Configuration

Registers").

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