User's Guide

LE920A4 HW User Guide Hardware Interfaces
Doc#: 1VV0301261 HSIC Interface (Optional)
Rev. 4.7.1 Page 69 of 124 2019-11-21
8.1.1. USB OTG support
In order to support USB OTG, an additional 5V power supply as well as some additional
connectivity should be added externally.
The below drawing provides a high level application circuit for enabling OTG connectivity
Figure 14 OTG Connectivity
Any available USB OTG 5V Boost such as LTC3529EDCB can be used
HSIC Interface (Optional)
The application processor exposes a High-Speed Inter-Chip (HSIC). HSIC eliminates the
analog transceiver from a USB interface for lower voltage operation and reduced power
dissipation. The HSIC interface is compliant with Ref 8: High-Speed Inter-Chip USB
Electrical Specification, version 1.0 (a supplement to the USB 2.0 specification, Section
3.8.2), and supports the following:
 High-speed 480 Mbps (240 MHz DDR) USB transfers are 100% host driver
compatible with traditional USB cable connected topologies
 Bidirectional data strobe signal (STROBE)
 Bidirectional data signal (DATA)
 No power consumption unless a transfer is in progress
Further details will be provided in a future release of this document.
SHDN
FAULT
VOUT
GPIOx
GPIOx
0 Ohm
LE920x4
USB Connector
USB D+
USB D-
USB ID
D19
USB ID (B19)
F19
ADC_IN1 (D5)
USB_VBUS (A18)
LTC3529EDCB
VBUS
VBATT
IDD-D+