User's Manual

Page 47 of 83

A Carrier Corp. Company

PART NUMBER T82002163

REV A

Note: For Figure 12-17, UP2OCR[SEOS] = 4 for USB client and UP2OCR[SEOS] = 5 for USB host.

Interface to External Charge Pump Device

In addition to the interface options described in Section 12.5.4, the UDC provides control outputs

and interrupt inputs to drive and monitor an external charge pump device. To do so, the USB D+

and D– signals can be output using the on-chip OTG transceiver and the Vbus interface provided

by an external charge pump device. In this mode, UP2OCR[HXS] is used control multiplexors to

select between UDC and USB host controller D+, D–, and transmit enable signals to be output

through the USB host controller port 2 transceiver. In addition, USB Port 2 Output Control

pulse enable (CPVPE) control output bits used to enable the driving of Vbus and to enable the

driving of pulses on Vbus, respectively. Additionally, USB Port 2 Output Control Register

(UP2OCR) provides the Vbus valid 4.0-V, Vbus valid 4.4-V, session valid, and session request

protocol detected interrupt inputs to interface to the external charge pump device. Figure 12-18

illustrates the OTG connections to an external charge pump device.

Figure 12-18. Connection to External OTG Charge Pump