AT43USB380E-AC

Overview

The AT43USB380E-AC is a USB 2.0 On-The-Go (OTG) Host/Function Processor designed as an upgrade to the AT43USB370. It supports full-speed USB communication and integrates an on-chip OTG interface for role determination via ID pin sensing. The device features a configurable generic host processor interface supporting 8, 16, or 32-bit widths, allowing up to 16 GPIO pins when narrower interfaces are selected. It operates with a 3.3V supply and includes a JTAG interface for debugging. Firmware libraries provide high-level APIs for transparent USB protocol handling, including Host Negotiation Protocol (HNP) and Session Request Protocol (SRP).

Feature Summary

• Integrated USB 2.0 OTG interface with on-chip ID detection for automatic host/function role assignment.
• Configurable 8/16/32-bit generic host processor interface with multiplexed GPIO capabilities.
• Supports Host Negotiation Protocol (HNP) and Session Request Protocol (SRP) via embedded firmware.
• Includes charge pump control signals (EN, PUMP_EN, DISCHARGE, LOW_CUR) for external power management.

Applications

• USB On-The-Go host and function devices requiring dynamic role switching.
• Portable data storage devices and digital cameras with dual connectivity.
• Industrial controllers needing direct USB host access without a separate host controller chip.

Procurement Notes

Verify that the specific ordering suffix 'E-AC' corresponds to the exact package and temperature grade required, as the source document primarily details the AT43USB380 functional specifications. Confirm compatibility with existing AT43USB370 designs if upgrading, noting the necessary hardware modifications for the OTG interface and charge pump connections.

Selection Notes

Select this component when an integrated USB OTG solution is needed to replace the AT43USB370. Ensure the design accommodates the variable-width host interface requirements and provides an external charge pump (e.g., AT43CD001) for VBUS power sourcing and signaling during OTG sessions. Verify system clock synchronization settings for WAIT_N and DREQ_N signals.

Part Context

The AT43USB380 serves as a functional successor to the AT43USB370, adding OTG capabilities while maintaining software compatibility through shared high-level APIs. It bridges the gap between standard USB host controllers and mobile OTG applications by integrating session negotiation logic directly into the silicon.

Replacement Considerations

The AT43USB370 is a direct functional predecessor. Replacement requires minor hardware modifications to support the on-chip OTG interface and connection of an external charge pump for full OTG functionality.