UPD360 datasheet(175/221 Pages) MICROCHIP

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 2016-2017 Microchip Technology Inc.

DS00002084C-page 175

UPD360

12.3.2

THERMAL MANAGEMENT

The PPC utilizes internal thermal management:

12.3.2.1

Thermal Shutdown

The thermal management consists of a hardware implemented thermal shutdown corresponding to the maximum allow-

able internal die temperature (tTSD). If the internal temperature exceeds this value, the port power switches (both ports)

will immediately be turned off until the temperature is below tTSD - tTSD_HYST.

12.3.3

VBUS DISCHARGE

The PPC will discharge VBUS through an internal 100 Ohm resistor when at least one of the following conditions occurs:

•The PWR_EN control (UPD360-A/UPD360-B only) is disabled (triggered on the inactive edge of the PWR_EN

control) (Standalone DFP mode only).

•The VS voltage drops below a specified threshold VS_UVLO (2.5 V) that causes the port power switch to be dis-

abled.

• When commanded into the Sleep power state.

• Upon recovery from the Error state.

• When commanded via the DISCHARGE bit.

• Any time that the port power switch is activated after the VBUS bypass switch has been on.

• Any time that the VBUS bypass switch is activated after the port power switch has been on.

When the VBUS discharge circuitry is activated, at the end of the tDISCHARGE time, the PPC will confirm that VBUS was

discharged. If the VBUS voltage is not below the VTEST level, a discharge error will be flagged (by setting theVBUS Dis-

charge Error bit in the Power Interrupt Status Register (PWR_INT_STS)) and the PPC will enter the Error state.

12.4

VBUS Bypass Switch

The device contains circuitry to provide VBUS current as shown in Figure 12-3. The VBUS bypass switch and the port

power switch are never both on at the same time.

FIGURE 12-3:

VBUS BYPASS SWITCH

Port Power

Switch

VBUS

Bypass

Switch

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