 2018-2019 Microchip Technology Inc.

DS00002838B-page 17

UPD301A

4.2

Power States

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

• STANDBY

• ATTACHED IDLE

• ACTIVE

4.2.1

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 UPD301A device will be in when in USB Type-C™ Unattached.SRC.

4.2.2

ATTACHED IDLE

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.

4.2.3

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.

4.3

Cable Plug Orientation and Detection

4.3.1

CC COMPARATOR

The device integrates a comparator and DAC circuit to implement Type-C attach and detach functions. It supports up

to eight programmable thresholds for attach detection between UFP and DFP. When operating as a UFP, the device

supports detecting changes in the DFP’s advertised thresholds to determine current sourcing capability. The default

nominal values for the thresholds detected by the CC comparators are:

• 0.20 V

• 0.40 V

• 0.66 V

• 0.80 V

• 1.23 V

• 1.60 V

• 2.60 V

• 3.0 V Proprietary Mode