UCS1002-1 datasheet(44/116 Pages) MICROCHIP

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Programmable USB Port Power Controller with Charger Emulation

Datasheet

Revision 1.4 (07-16-13)

SMSC UCS1002

DATASHEET

5.2.3

Back-voltage Detection

Whenever the following conditions are true, the port power switch will be disabled, the VBUS bypass

switch will be disabled, the high-speed data switch will be disabled, and a Back-voltage event will be

flagged. This will cause the UCS1002 to enter the Error power state (see Section 5.1.5, "Error State

Operation").

1. The VBUS voltage exceeds the VS voltage by VBV_TH and the port power switch is closed. The

port power switch will be opened immediately. If the condition lasts for longer than tMASK, then the

UCS1002 will enter the Error state. Otherwise, the port power switch will be turned on as soon as

the condition is removed.

2. The VBUS voltage exceeds the VDD voltage by VBV_TH and the VBUS bypass switch is closed.

The bypass switch will be opened immediately. If the condition lasts for longer than tMASK, then the

UCS1002 will enter the Error state. Otherwise, the bypass switch will be turned on as soon as the

condition is removed.

5.2.4

Back-drive Current Protection

If a portable device is attached that is self-powered, it may drive the VBUS port to its power supply

voltage level; however, the UCS1002 is designed such that leakage current from the VBUS pins to the

VDD or VS pins shall not exceed IBD_1 (if the VDD voltage is zero) or IBD_2 (if the VDD voltage exceeds

VDD_TH).

5.2.5

Under-voltage Lockout on VS

The UCS1002 requires a minimum voltage (VS_UVLO) be present on the VS pin for Active power state.

5.2.6

Over-voltage Detection and Lockout on VS

The UCS1002 port power switch will be disabled if the voltage on the VS pin exceeds a voltage

(VS_OV) for longer than the specified time (tMASK). This will cause the device to enter the Error state.

5.3

Discrete Input Pins

APPLICATION NOTE: If it is necessary to connect any of the control pins except the COMM_SEL / ILIM or SEL

pins via a resistor to VDD or GND, the resistor value should not exceed 100 k

Ω in order to

meet the VIH and VIL specifications.

5.3.1

COMM_SEL / ILIM Input

The COMM_SEL / ILIM input determines the initial ILIM settings and the communications mode, as

shown in Table 4.1, "UCS1002 Communication Mode and ILIM Selection".

5.3.2

SEL Input

The SEL pin selects the polarity of the PWR_EN control. In addition, if the UCS1002 is not configured

to operate in Stand-alone mode, the SEL pin determines the SMBus address. See Table 4.2, "SEL Pin

Decode". The SEL pin state is latched upon device power-up and further changes will have no effect.

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