UPD360 datasheet(171/221 Pages) MICROCHIP

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 2016-2017 Microchip Technology Inc.

DS00002084C-page 171

UPD360

12.0

USB PORT POWER CONTROLLER (PPC)

The device’s USB Port Power Controller (PPC) provides 3.0 A of continuous current (3.2 A max) on VBUS with precision

over-current limiting (OCL), under- and over-voltage lockout, and dynamic thermal management. The PPC also includes

a VBUS discharge function and constant current mode current limiting for BC 1.2 applications.

12.1

PPC Power States

The PPC provides the following power states:

• Sleep: This is the lowest PPC power state available. See Section 12.1.1, "Sleep State Operation" for additional

information.

• Error: This state is entered when a fault condition exists. The PPC interrupt status registers detail the error condi-

tion. See Section 12.1.3, "Error State Operation" for additional information.

• Active: In this state, the PPC is active and sourcing current to VBUS. No errors are present. This power state pro-

vides full functionality. While in this state, operations include activation of the port power switch and current limit-

ing. See Section 12.1.2, "Active State Operation" for additional information.

12.1.1

SLEEP STATE OPERATION

The PWR_EN pin (UPD360-A/UPD360-B operating in standalone DFP mode only) may be used to cause the PPC to

enter/exit sleep. When the PPC is in the Sleep state, the device will be in its lowest power state. The bypass switch, and

the port power switch will be disabled. VBUS will be near ground potential.

12.1.2

ACTIVE STATE OPERATION

When the PPC enters the Active state, the port power switch is closed. The PPC cannot be in the Active state (and

therefore, the port power switch cannot be turned on) if any of the following conditions exist:

• VS < VS_UVLO (2.5 V).

• PWR_EN is disabled (standalone DFP mode only).

12.1.3

ERROR STATE OPERATION

The PPC will enter the Error state from the Active state when any of the following events are detected:

• The maximum allowable internal die temperature tTSD has been exceeded.

• An over-current condition has been detected.

• An under-voltage condition on VS has been detected (see Section 12.2.1, "Under-Voltage Lockout on VS").

• A discharge error has been detected.

• An over-voltage condition on the VS pin.

When the PPC enters the Error state, the port power switch and the VBUS bypass switch will be disabled, and ALERT

is asserted (by default). They will remain off while in this power state. The PPC will leave this state as determined by

the fault handling selection.

With the Auto-recovery fault handler, the PPC will check that all of the error conditions have been removed. If all of the

error conditions have been removed, the PPC will return to the Active state. The ERR_RECOVER pin is used in stand-

alone DFP mode to select the auto-recovery algorithm.

12.2

Supply Voltages

12.2.1

UNDER-VOLTAGE LOCKOUT ON VS

The PPC requires a minimum voltage VS_UVLO (2.5 V) be present on the VS pin for the Active power state.

Note:

The PPC DC and AC parameters can be seen in Table 16-6, “Port Power Controller DC Parameters,” on

page 209 and Table 16-12, “Port Power Controller AC Parameters,” on page 212, respectively.

Note:

The PPC power state is reflected in the PWR_STATE[1:0] field of the PPC General Configuration 3 Reg-

ister (PPC_GENERAL_CFG3).

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