USB5537B datasheet(24/79 Pages) MICROCHIP

24 / 79 page

USB5537B

DS00001682C-page 24

 2012 - 2015 Microchip Technology Inc.

5.0

FUNCTIONAL OPERATION

This chapter details the functional operation of various device features.

5.1

Charging Port Configuration

The USB5537B supports downstream charging ports on any available port. The hub contains internal hardware and

algorithms to natively support various voltage levels on the D+/D- signals along with the BC 1.2 Handshaking protocol,

allowing charging devices to detect the downstream port as a charging port.

A port can be configured for either RapidCharge support or Samsung Legacy Charging mode support. This section

details the various charging port modes. The following terminology will be helpful in the understanding of these features:

• SDP - Standard Downstream Port - A port that is not operating as a charging port and has active USB communi-

cations.

• CDP - Charging Downstream Port - A port that is operating as a charging port and has active USB communica-

tions.

• DCP - Dedicated Charging Port - A port that is operating as a charging port but has no USB communications.

• S0 - Normal system power state in full run.

• S3 - Typically a Sleep state, where the system can be woken from USB HID devices

• S4 - Typically a Hibernate sleep state, where the system state is stored to a hard drive and does not support wake

from USB HID devices.

• S5 - Typically an OFF state for a system.

5.1.1

RAPID CHARGE

This mode enables concurrent operation of Apple, BC 1.2 and DP/DM Shorted Emulation charging. The only applicable

options are to choose Apple 1A or Apple 2A charging mode on a per port basis. Refer to Section 5.2.1.1, "Apple

Charging Mode," on page 26.

5.1.2

SAMSUNG LEGACY CHARGING

This mode drives a specified voltage on the DP/DM lines to allow legacy Samsung devices to detect the port as

Charging capable. This is only operational in DCP modes.

5.1.3

DYNAMIC CHARGING PORT (6070 AND 6080 ONLY)

Dynamic Charging Port support utilizes the device’s DYNCPDIS_N pin to disable Battery Charging support globally

when low and, when high, allow any ports configured as Charging Ports (either through a configuration file or straps) to

resume their Battery Charging operation in the configured Charging mode.

This feature is currently supported only when using standard USB port power controllers. Please contact your Microchip

FAE if required to use this feature with other port power controller configurations.

Figure 5-1, Figure 5-2, and Figure 5-3 detail the operation of Dynamic Charging Port in the S0, S3, and S4/S5 power

modes, respectively. For any of the flow diagram transitions, there is a Y/Z nomenclature.

Y = Dynamic BC enable signal

Z = Device attached and sensed by device

Note:

Apple and DP/DM Shorted Emulation charging modes are only operational in DCP mode.

Note:

The Dynamic Charging Port feature and related DYNCPDIS_N pin function is available in the “-6070” and

“-6080” versions of the device only.

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