USB5537B Datasheet, PDF (24/79 Pages) Microchip Technology – 7-Port SS/HS USB Hub Controller

USB5537B
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.
Note: Apple and DP/DM Shorted Emulation charging modes are only operational in DCP mode.
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: The Dynamic Charging Port feature and related DYNCPDIS_N pin function is available in the “-6070” and
“-6080” versions of the device only.
DS00001682C-page 24
 2012 - 2015 Microchip Technology Inc.