UPD360 datasheet(31/221 Pages) MICROCHIP

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 2016-2017 Microchip Technology Inc.

DS00002084C-page 31

UPD360

7.0

CLOCKS, RESETS, AND POWER MANAGEMENT

This section details the various clocks, resets, and power managements states of the device:

7.1

Clocks

The following internal clocks are generated by the device:

• 48 MHz Relaxation Oscillator

• 20 KHz Keep Alive Oscillator

• Ring Oscillator

These oscillators can be manually enabled/disabled via the Clock Control Register (CLK_CTL).

7.2

Power States

The device supports four power states, as defined in the following sub-sections:

• SLEEP

• STANDBY

• ACTIVE_PPC_OFF

• ACTIVE_PPC_ON

7.2.1

SLEEP

This is the lowest power state of the device. The SLEEP state is entered via assertion of the PWR_DN pin. Virtually all

of the device is powered off in this mode with minimal circuity in the 3.3V domain to detect deassertion of PWR_DN.

This mode is intended to minimize power consumption when the device is not being used in battery powered applica-

tions. In these applications, a wake up event such as a button press, can cause the host CPU to deassert PWR_DN.

7.2.2

STANDBY

STANDBY is the lowest power functional state of the device. The majority of the device is powered off in this state. The

internal CC comparator and 20 KHz oscillator are enabled in this state as well as requisite analog components (1.8V

LDO, PORs, Biases, etc).

The CC lines are constantly monitored for an attach condition which shall result in an interrupt assertion to the host. If

an attachment has been made, this state can detect a change in the partner’s advertisement as well as a detach.

STANDBY is the power state that the UPD360 device will be in when in USB Type-CTM Unattached.SRC/SNK.

The following asynchronous wake-ups are supported from this state:

• Asynchronous I2C Wakeup (UPD360-A/UPD360-B Only)

• Asynchronous SPI Wakeup (UPD360-C Only)

• Power Delivery MAC Wakeup

7.2.3

ACTIVE_PPC_OFF

This state defines the condition where the internal 48 MHz oscillator is enabled, but the Port Power Controller is dis-

abled. A use case for this state would be when it is desired to debounce a GPIO for a micro-second period. In that case,

the internal 48 MHz oscillator is required to time the debounce.

The device also momentarily enters this state when being addressed via software I2C/SPI accesses or to implement

Power Delivery communications.

The UPD360 will be in ACTIVE_PPC_OFF primarily when in USB Type-CTM Attached.SNK state, or Attached.SRC

state with VBUS being driven by an external power source.

7.2.4

ACTIVE_PPC_ON

This state defines the condition where the Port Power Controller is operational, which necessitates the internal 48 MHz

oscillator be enabled for the Port Power Controller.

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