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2020 Microchip Technology Inc.

DS00003412A-page 19

UPD301B/C

4.2

Power States

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

• SLEEP

• HIBERNATE

• STANDBY

• ATTACHED IDLE (FRS Enabled)

• ATTACHED IDLE (FRS Disabled)

• ACTIVE

4.2.1

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.

4.2.2

HIBERNATE

In this state, the port is disabled by the USB PD firmware and the

PWR_DN pin is low. Attach detection is disabled due

to CC terminations in the high-impedance state.

4.2.3

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.

4.2.4

ATTACHED IDLE (FRS ENABLED)

In this state, a USB Type-C™ device is connected and the USB PD bus is idle (no USB packets in transit). The CC

signals are constantly being monitored for packet transmission and Fast Role Swap (FRS) signal detection is enabled.

4.2.5

ATTACHED IDLE (FRS DISABLED)

In this state, a USB Type-C™ device is connected and the USB PD bus is idle (no USB packets in transit). The CC

signals are constantly being monitored for packet transmission and Fast Role Swap (FRS) signal detection is disabled.

4.2.6

ACTIVE

This state defines the condition of the device after an attachment occurred. In this state, Power Delivery communication

is supported. This state is also used for any condition in which the 48 MHz Relaxation Oscillator must be enabled, such

as when it is desired to debounce a GPIO within the micro-second range.

When transmitting a Power Delivery packet, an additional 5 mA may be consumed. Additional power consumption

results from enabling the OCS comparator, VBUS comparator and other modules. When VCONN FETs are enabled,

there is an additional 70 mW of power consumption.

This section details the functions that control and monitor the CC pins, monitor the

VBUS_DET pin, control the VCONN

FETs, and sample the

CFG_SEL pin.