UPD1002 datasheet(27/46 Pages) MICROCHIP

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 2014 Microchip Technology Inc.

DS00001760B-page 27

UPD1002

• When operating as a Provider:

- The UFP will never initiate a swap request to its partner to become a Consumer.

- If the device receives a swap request from its partner to become a Consumer, it automatically accepts it and

will remain in the Consumer role (until the partner requests another swap back to provider, or there is a hard

reset or other exception condition that causes the protocol to be reinitiated from startup). The behavior

accounts for a partner that may have its own other external power which it decided to use instead of the

UFP’s.

Provider/Consumer (STD-A) Configurations (32-PC_A)

Swapping rules for Provider/Consumer (STD-A receptacle) configurations are defined as follows:

• When operating as a Provider:

- If externally powered:

- Do not initiate swap

- Do not accept swap

- If not externally powered:

- Initiate swap

- Accept swap

• When operating as a Consumer:

- If externally powered:

- Initiate swap

- Accept swap

- If not externally powered:

- Do not initiate swap

- Do not accept swap

Provider/Consumer (Micro-AB) Configurations (32-PC_uAB)

Swapping rules for Provider/Consumer (Micro-AB receptacle) configurations are dependent on the connected plug type.

When a Micro-A plug is not connected (ID pin to GND >= 1M

Ω, no plug connected, or Micro-B plug connected), the

device operates as a Consumer only and does not support role swaps.

When a Micro-A plug is connected (ID pin to GND < 1M

Ω), the device operates as a Provider/Consumer with the fol-

lowing rules:

• When operating as a Provider:

- If externally powered:

- Do not initiate swap

- Do not accept swap

- If not externally powered:

- Initiate swap

- Accept swap

• When operating as a Consumer:

- If externally powered:

- Initiate swap

- Accept swap

- If not externally powered:

- Do not initiate swap

- Do not accept swap

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