UPD360 datasheet(182/221 Pages) MICROCHIP

номер детали	UPD360

подробное описание детали	Highly Integrated Small Form Factor USB Type-C??Power Delivery 2.0 Port Controller

PDF	221 Pages

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производитель	MICROCHIP [Microchip Technology]

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182 / 221 page

UPD360

DS00002084C-page 182

 2016-2017 Microchip Technology Inc.

13.0

POWER SWITCH

To enable the device to efficiently support dead battery use cases, an integrated power switch is provided to select

between two external +3.3V supplies:

• 3V3_ALW: +3.3V main power supply input to integrated power switch.

• 3V3_VBUS: +3.3V power supply input derived from VBUS to the integrated power switch.

The power switch allows the core to be powered from 3V3_ALW normally, and from 3V3_VBUS when 3V3_ALW is not

present. This effectively allows connection detection and system wakeup without external processor intervention (exter-

nal processor in sleep mode).

Attached to 3V3_ALW and 3V3_VBUS are two FET switches. The first FET switches have a diode across the output.

There are three voltage comparators. VBUS_PWRGD is on when 3V3_VBUS exceeds 2.7V. 3V3_ALW_PWRGD is on

when 3V3_ALW exceeds 2.7V. VCORE_PWRGD is on when the core voltage reaches an operational level.

If VCORE_PWRGD is not asserted, the part is held in reset. If both VBUS_PWRGD and 3V3_ALW_PWRGD are not

asserted, the part is held in reset, regardless of the state of the VCORE_PWRGD.

A block diagram of the internal power switch can be seen in Figure 13-1.

FIGURE 13-1:

POWER SWITCH BLOCK DIAGRAM

3V3_ALW

3V3_VBUS

VSW

LDO

3V3_VBUS _PWRGD

3V3_ALWAYS _PWRGD

VCORE_PWRGD

SWITCH

CONTROL

3V3_ALWAYS_PWRGD

3V3_VBUS_PWRGD

VCORE_PWRGD

1.8V Analog

1.8V Core

VMUX_PWRGD

UPD360 датащи(PDF) 182 Page - Microchip Technology