User's Manual

LE920A4 HW User Guide Hardware Interfaces

Doc#: 1VV0301261 HSIC Interface

Rev. 4.3 Page 70 of 123 2017-12-07

At least test points of the USB signals are required since the USB physical

communication is needed in the case of SW update.

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

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

SHDN

FAULT

VOUT

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+